glib/docs/reference/glib/html/glib-The-Main-Event-Loop.html - nest-cam/4320010/glib - Git at Google

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>The Main Event Loop: GLib Reference Manual</title>
 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
 <link rel="home" href="index.html" title="GLib Reference Manual">
 <link rel="up" href="glib-core.html" title="GLib Core Application Support">
 <link rel="prev" href="glib-core.html" title="GLib Core Application Support">
 <link rel="next" href="glib-Threads.html" title="Threads">
 <meta name="generator" content="GTK-Doc V1.25.1 (XML mode)">
 <link rel="stylesheet" href="style.css" type="text/css">
 </head>
 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
 <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
 <td width="100%" align="left" class="shortcuts">
 <a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span>
                   <a href="#glib-The-Main-Event-Loop.description" class="shortcut">Description</a></span>
 </td>
 <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
 <td><a accesskey="u" href="glib-core.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
 <td><a accesskey="p" href="glib-core.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
 <td><a accesskey="n" href="glib-Threads.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
 </tr></table>
 <div class="refentry">
 <a name="glib-The-Main-Event-Loop"></a><div class="titlepage"></div>
 <div class="refnamediv"><table width="100%"><tr>
 <td valign="top">
 <h2><span class="refentrytitle"><a name="glib-The-Main-Event-Loop.top_of_page"></a>The Main Event Loop</span></h2>
 <p>The Main Event Loop — manages all available sources of events</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.functions"></a><h2>Functions</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="functions_return">
 <col class="functions_name">
 </colgroup>
 <tbody>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="returnvalue">GMainLoop</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-new" title="g_main_loop_new ()">g_main_loop_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="returnvalue">GMainLoop</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-ref" title="g_main_loop_ref ()">g_main_loop_ref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-unref" title="g_main_loop_unref ()">g_main_loop_unref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()">g_main_loop_run</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-quit" title="g_main_loop_quit ()">g_main_loop_quit</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-is-running" title="g_main_loop_is_running ()">g_main_loop_is_running</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-get-context" title="g_main_loop_get_context ()">g_main_loop_get_context</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-new" title="g_main_new()">g_main_new</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-destroy" title="g_main_destroy()">g_main_destroy</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-run" title="g_main_run()">g_main_run</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-quit" title="g_main_quit()">g_main_quit</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-is-running" title="g_main_is_running()">g_main_is_running</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-new" title="g_main_context_new ()">g_main_context_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-ref" title="g_main_context_ref ()">g_main_context_ref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-unref" title="g_main_context_unref ()">g_main_context_unref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-default" title="g_main_context_default ()">g_main_context_default</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()">g_main_context_iteration</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-iteration" title="g_main_iteration()">g_main_iteration</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pending" title="g_main_context_pending ()">g_main_context_pending</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#g-main-pending" title="g_main_pending">g_main_pending</a></td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-find-source-by-id" title="g_main_context_find_source_by_id ()">g_main_context_find_source_by_id</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-find-source-by-user-data" title="g_main_context_find_source_by_user_data ()">g_main_context_find_source_by_user_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-find-source-by-funcs-user-data" title="g_main_context_find_source_by_funcs_user_data ()">g_main_context_find_source_by_funcs_user_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-wakeup" title="g_main_context_wakeup ()">g_main_context_wakeup</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()">g_main_context_acquire</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-release" title="g_main_context_release ()">g_main_context_release</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-is-owner" title="g_main_context_is_owner ()">g_main_context_is_owner</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-wait" title="g_main_context_wait ()">g_main_context_wait</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-prepare" title="g_main_context_prepare ()">g_main_context_prepare</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()">g_main_context_query</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-check" title="g_main_context_check ()">g_main_context_check</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-dispatch" title="g_main_context_dispatch ()">g_main_context_dispatch</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-set-poll-func" title="g_main_context_set_poll_func ()">g_main_context_set_poll_func</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GPollFunc" title="GPollFunc ()"><span class="returnvalue">GPollFunc</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-poll-func" title="g_main_context_get_poll_func ()">g_main_context_get_poll_func</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="glib-The-Main-Event-Loop.html#GPollFunc" title="GPollFunc ()">*GPollFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-add-poll" title="g_main_context_add_poll ()">g_main_context_add_poll</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-remove-poll" title="g_main_context_remove_poll ()">g_main_context_remove_poll</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-depth" title="g_main_depth ()">g_main_depth</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-current-source" title="g_main_current_source ()">g_main_current_source</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-set-poll-func" title="g_main_set_poll_func()">g_main_set_poll_func</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-invoke" title="g_main_context_invoke ()">g_main_context_invoke</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-invoke-full" title="g_main_context_invoke_full ()">g_main_context_invoke_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-thread-default" title="g_main_context_get_thread_default ()">g_main_context_get_thread_default</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-ref-thread-default" title="g_main_context_ref_thread_default ()">g_main_context_ref_thread_default</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-push-thread-default" title="g_main_context_push_thread_default ()">g_main_context_push_thread_default</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pop-thread-default" title="g_main_context_pop_thread_default ()">g_main_context_pop_thread_default</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new" title="g_timeout_source_new ()">g_timeout_source_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new-seconds" title="g_timeout_source_new_seconds ()">g_timeout_source_new_seconds</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()">g_timeout_add</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-full" title="g_timeout_add_full ()">g_timeout_add_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-seconds" title="g_timeout_add_seconds ()">g_timeout_add_seconds</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-seconds-full" title="g_timeout_add_seconds_full ()">g_timeout_add_seconds_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-source-new" title="g_idle_source_new ()">g_idle_source_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()">g_idle_add</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add-full" title="g_idle_add_full ()">g_idle_add_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-remove-by-data" title="g_idle_remove_by_data ()">g_idle_remove_by_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="glib-The-Main-Event-Loop.html#GChildWatchFunc" title="GChildWatchFunc ()">*GChildWatchFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-source-new" title="g_child_watch_source_new ()">g_child_watch_source_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-add" title="g_child_watch_add ()">g_child_watch_add</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-add-full" title="g_child_watch_add_full ()">g_child_watch_add_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-poll" title="g_poll ()">g_poll</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="glib-The-Main-Event-Loop.html#GSourceDummyMarshal" title="GSourceDummyMarshal ()">*GSourceDummyMarshal</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-new" title="g_source_new ()">g_source_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-ref" title="g_source_ref ()">g_source_ref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-unref" title="g_source_unref ()">g_source_unref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-funcs" title="g_source_set_funcs ()">g_source_set_funcs</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()">g_source_attach</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-destroy" title="g_source_destroy ()">g_source_destroy</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-is-destroyed" title="g_source_is_destroyed ()">g_source_is_destroyed</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-priority" title="g_source_set_priority ()">g_source_set_priority</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-priority" title="g_source_get_priority ()">g_source_get_priority</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-can-recurse" title="g_source_set_can_recurse ()">g_source_set_can_recurse</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-can-recurse" title="g_source_get_can_recurse ()">g_source_get_can_recurse</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-id" title="g_source_get_id ()">g_source_get_id</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <span class="returnvalue">char</span> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-name" title="g_source_get_name ()">g_source_get_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-name" title="g_source_set_name ()">g_source_set_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-name-by-id" title="g_source_set_name_by_id ()">g_source_set_name_by_id</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-context" title="g_source_get_context ()">g_source_get_context</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-callback" title="g_source_set_callback ()">g_source_set_callback</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()">*GSourceFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-callback-indirect" title="g_source_set_callback_indirect ()">g_source_set_callback_indirect</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-ready-time" title="g_source_set_ready_time ()">g_source_set_ready_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-ready-time" title="g_source_get_ready_time ()">g_source_get_ready_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="returnvalue">gpointer</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()">g_source_add_unix_fd</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-unix-fd" title="g_source_remove_unix_fd ()">g_source_remove_unix_fd</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-modify-unix-fd" title="g_source_modify_unix_fd ()">g_source_modify_unix_fd</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="returnvalue">GIOCondition</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-query-unix-fd" title="g_source_query_unix_fd ()">g_source_query_unix_fd</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-poll" title="g_source_add_poll ()">g_source_add_poll</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-poll" title="g_source_remove_poll ()">g_source_remove_poll</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-child-source" title="g_source_add_child_source ()">g_source_add_child_source</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-child-source" title="g_source_remove_child_source ()">g_source_remove_child_source</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-time" title="g_source_get_time ()">g_source_get_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-current-time" title="g_source_get_current_time ()">g_source_get_current_time</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove" title="g_source_remove ()">g_source_remove</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-by-funcs-user-data" title="g_source_remove_by_funcs_user_data ()">g_source_remove_by_funcs_user_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-by-user-data" title="g_source_remove_by_user_data ()">g_source_remove_by_user_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.other"></a><h2>Types and Values</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="name">
 <col class="description">
 </colgroup>
 <tbody>
 <tr>
 <td class="datatype_keyword"> </td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop">GMainLoop</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH:CAPS" title="G_PRIORITY_HIGH">G_PRIORITY_HIGH</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT">G_PRIORITY_DEFAULT</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH-IDLE:CAPS" title="G_PRIORITY_HIGH_IDLE">G_PRIORITY_HIGH_IDLE</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT-IDLE:CAPS" title="G_PRIORITY_DEFAULT_IDLE">G_PRIORITY_DEFAULT_IDLE</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-LOW:CAPS" title="G_PRIORITY_LOW">G_PRIORITY_LOW</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-CONTINUE:CAPS" title="G_SOURCE_CONTINUE">G_SOURCE_CONTINUE</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-REMOVE:CAPS" title="G_SOURCE_REMOVE">G_SOURCE_REMOVE</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword"> </td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext">GMainContext</a></td>
 </tr>
 <tr>
 <td class="typedef_keyword">typedef</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid">GPid</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-PID-FORMAT:CAPS" title="G_PID_FORMAT">G_PID_FORMAT</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD">GPollFD</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#G-POLLFD-FORMAT:CAPS" title="G_POLLFD_FORMAT">G_POLLFD_FORMAT</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource">GSource</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs">GSourceFuncs</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="glib-The-Main-Event-Loop.html#GSourceCallbackFuncs" title="struct GSourceCallbackFuncs">GSourceCallbackFuncs</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.includes"></a><h2>Includes</h2>
 <pre class="synopsis">#include &lt;glib.h&gt;
 </pre>
 </div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.description"></a><h2>Description</h2>
 <p>The main event loop manages all the available sources of events for
 GLib and GTK+ applications. These events can come from any number of
 different types of sources such as file descriptors (plain files,
 pipes or sockets) and timeouts. New types of event sources can also
 be added using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>.</p>
 <p>To allow multiple independent sets of sources to be handled in
 different threads, each source is associated with a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>.
 A GMainContext can only be running in a single thread, but
 sources can be added to it and removed from it from other threads.</p>
 <p>Each event source is assigned a priority. The default priority,
 <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a>, is 0. Values less than 0 denote higher priorities.
 Values greater than 0 denote lower priorities. Events from high priority
 sources are always processed before events from lower priority sources.</p>
 <p>Idle functions can also be added, and assigned a priority. These will
 be run whenever no events with a higher priority are ready to be processed.</p>
 <p>The <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> data type represents a main event loop. A GMainLoop is
 created with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-new" title="g_main_loop_new ()"><code class="function">g_main_loop_new()</code></a>. After adding the initial event sources,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a> is called. This continuously checks for new events from
 each of the event sources and dispatches them. Finally, the processing of
 an event from one of the sources leads to a call to <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-quit" title="g_main_loop_quit ()"><code class="function">g_main_loop_quit()</code></a> to
 exit the main loop, and <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a> returns.</p>
 <p>It is possible to create new instances of <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> recursively.
 This is often used in GTK+ applications when showing modal dialog
 boxes. Note that event sources are associated with a particular
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, and will be checked and dispatched for all main
 loops associated with that GMainContext.</p>
 <p>GTK+ contains wrappers of some of these functions, e.g. <a href="http://developer.gnome.org/gtk3/gtk3-General.html#gtk-main"><code class="function">gtk_main()</code></a>,
 <a href="http://developer.gnome.org/gtk3/gtk3-General.html#gtk-main-quit"><code class="function">gtk_main_quit()</code></a> and <a href="http://developer.gnome.org/gtk3/gtk3-General.html#gtk-events-pending"><code class="function">gtk_events_pending()</code></a>.</p>
 <div class="refsect3">
 <a name="id-1.4.2.6.9"></a><h4>Creating new source types</h4>
 <p>One of the unusual features of the <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> functionality
 is that new types of event source can be created and used in
 addition to the builtin type of event source. A new event source
 type is used for handling GDK events. A new source type is created
 by "deriving" from the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> structure. The derived type of
 source is represented by a structure that has the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> structure
 as a first element, and other elements specific to the new source
 type. To create an instance of the new source type, call
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-new" title="g_source_new ()"><code class="function">g_source_new()</code></a> passing in the size of the derived structure and
 a table of functions. These <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> determine the behavior of
 the new source type.</p>
 <p>New source types basically interact with the main context
 in two ways. Their prepare function in <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> can set a timeout
 to determine the maximum amount of time that the main loop will sleep
 before checking the source again. In addition, or as well, the source
 can add file descriptors to the set that the main context checks using
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-poll" title="g_source_add_poll ()"><code class="function">g_source_add_poll()</code></a>.</p>
 </div>
 <div class="refsect3">
 <a name="id-1.4.2.6.10"></a><h4>Customizing the main loop iteration</h4>
 <p>Single iterations of a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> can be run with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a>. In some cases, more detailed control
 of exactly how the details of the main loop work is desired, for
 instance, when integrating the <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> with an external main loop.
 In such cases, you can call the component functions of
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a> directly. These functions are
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-prepare" title="g_main_context_prepare ()"><code class="function">g_main_context_prepare()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()"><code class="function">g_main_context_query()</code></a>,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-check" title="g_main_context_check ()"><code class="function">g_main_context_check()</code></a> and <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-dispatch" title="g_main_context_dispatch ()"><code class="function">g_main_context_dispatch()</code></a>.</p>
 </div>
 <div class="refsect3">
 <a name="mainloop-states"></a><h4>State of a Main Context</h4>
 <p>The operation of these functions can best be seen in terms
 of a state diagram, as shown in this image.</p>
 <p><span class="inlinemediaobject"><img src="mainloop-states.gif"></span></p>
 <p>On UNIX, the GLib mainloop is incompatible with <code class="function">fork()</code>. Any program
 using the mainloop must either <code class="function">exec()</code> or <code class="function">exit()</code> from the child
 without returning to the mainloop.</p>
 </div>
 <div class="refsect3">
 <a name="mainloop-memory-management"></a><h4>Memory management of sources</h4>
 <p>There are two options for memory management of the user data passed to a
 <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> to be passed to its callback on invocation. This data is provided
 in calls to <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-full" title="g_timeout_add_full ()"><code class="function">g_timeout_add_full()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>, etc. and
 more generally, using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-callback" title="g_source_set_callback ()"><code class="function">g_source_set_callback()</code></a>. This data is typically an
 object which ‘owns’ the timeout or idle callback, such as a widget or a
 network protocol implementation. In many cases, it is an error for the
 callback to be invoked after this owning object has been destroyed, as that
 results in use of freed memory.</p>
 <p>The first, and preferred, option is to store the source ID returned by
 functions such as <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a> or <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, and explicitly
 remove that source from the main context using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove" title="g_source_remove ()"><code class="function">g_source_remove()</code></a> when the
 owning object is finalized. This ensures that the callback can only be
 invoked while the object is still alive.</p>
 <p>The second option is to hold a strong reference to the object in the
 callback, and to release it in the callback’s <a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a>. This ensures
 that the object is kept alive until after the source is finalized, which is
 guaranteed to be after it is invoked for the final time. The <a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a>
 is another callback passed to the ‘full’ variants of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> functions (for
 example, <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-full" title="g_timeout_add_full ()"><code class="function">g_timeout_add_full()</code></a>). It is called when the source is finalized,
 and is designed for releasing references like this.</p>
 <p>One important caveat of this second approach is that it will keep the object
 alive indefinitely if the main loop is stopped before the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> is
 invoked, which may be undesirable.</p>
 </div>
 </div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.functions_details"></a><h2>Functions</h2>
 <div class="refsect2">
 <a name="g-main-loop-new"></a><h3>g_main_loop_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="returnvalue">GMainLoop</span></a> *
 g_main_loop_new (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> is_running</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> structure.</p>
 <div class="refsect3">
 <a name="g-main-loop-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>  (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>is_running</p></td>
 <td class="parameter_description"><p>set to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> to indicate that the loop is running. This
 is not very important since calling <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a> will set this to
 <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> anyway.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-loop-new.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-ref"></a><h3>g_main_loop_ref ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="returnvalue">GMainLoop</span></a> *
 g_main_loop_ref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Increases the reference count on a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> object by one.</p>
 <div class="refsect3">
 <a name="g-main-loop-ref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-loop-ref.returns"></a><h4>Returns</h4>
 <p> <em class="parameter"><code>loop</code></em>
 </p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-unref"></a><h3>g_main_loop_unref ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_loop_unref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Decreases the reference count on a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> object by one. If
 the result is zero, free the loop and free all associated memory.</p>
 <div class="refsect3">
 <a name="g-main-loop-unref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-run"></a><h3>g_main_loop_run ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_loop_run (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Runs a main loop until <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-quit" title="g_main_loop_quit ()"><code class="function">g_main_loop_quit()</code></a> is called on the loop.
 If this is called for the thread of the loop's <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>,
 it will process events from the loop, otherwise it will
 simply wait.</p>
 <div class="refsect3">
 <a name="g-main-loop-run.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-quit"></a><h3>g_main_loop_quit ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_loop_quit (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Stops a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> from running. Any calls to <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a>
 for the loop will return. </p>
 <p>Note that sources that have already been dispatched when
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-quit" title="g_main_loop_quit ()"><code class="function">g_main_loop_quit()</code></a> is called will still be executed.</p>
 <div class="refsect3">
 <a name="g-main-loop-quit.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-is-running"></a><h3>g_main_loop_is_running ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_loop_is_running (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Checks to see if the main loop is currently being run via <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-loop-is-running.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-loop-is-running.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the mainloop is currently being run.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-loop-get-context"></a><h3>g_main_loop_get_context ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_loop_get_context (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> *loop</code></em>);</pre>
 <p>Returns the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> of <em class="parameter"><code>loop</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-main-loop-get-context.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-loop-get-context.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> of <em class="parameter"><code>loop</code></em>
 . </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-new"></a><h3>g_main_new()</h3>
 <pre class="programlisting">#define             g_main_new(is_running)</pre>
 <div class="warning">
 <p><code class="literal">g_main_new</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-new" title="g_main_loop_new ()"><code class="function">g_main_loop_new()</code></a> instead</p>
 </div>
 <p>Creates a new <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> for th default main context.</p>
 <div class="refsect3">
 <a name="g-main-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>is_running</p></td>
 <td class="parameter_description"><p>set to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> to indicate that the loop is running. This
 is not very important since calling <a class="link" href="glib-The-Main-Event-Loop.html#g-main-run" title="g_main_run()"><code class="function">g_main_run()</code></a> will set this
 to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> anyway.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-new.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-destroy"></a><h3>g_main_destroy()</h3>
 <pre class="programlisting">#define             g_main_destroy(loop)</pre>
 <div class="warning">
 <p><code class="literal">g_main_destroy</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-unref" title="g_main_loop_unref ()"><code class="function">g_main_loop_unref()</code></a> instead</p>
 </div>
 <p>Frees the memory allocated for the <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.</p>
 <div class="refsect3">
 <a name="g-main-destroy.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-run"></a><h3>g_main_run()</h3>
 <pre class="programlisting">#define             g_main_run(loop)</pre>
 <div class="warning">
 <p><code class="literal">g_main_run</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a> instead</p>
 </div>
 <p>Runs a main loop until it stops running.</p>
 <div class="refsect3">
 <a name="g-main-run.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-quit"></a><h3>g_main_quit()</h3>
 <pre class="programlisting">#define             g_main_quit(loop)</pre>
 <div class="warning">
 <p><code class="literal">g_main_quit</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-quit" title="g_main_loop_quit ()"><code class="function">g_main_loop_quit()</code></a> instead</p>
 </div>
 <p>Stops the <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.
 If <a class="link" href="glib-The-Main-Event-Loop.html#g-main-run" title="g_main_run()"><code class="function">g_main_run()</code></a> was called to run the <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>, it will now return.</p>
 <div class="refsect3">
 <a name="g-main-quit.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-is-running"></a><h3>g_main_is_running()</h3>
 <pre class="programlisting">#define             g_main_is_running(loop)</pre>
 <div class="warning">
 <p><code class="literal">g_main_is_running</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-is-running" title="g_main_loop_is_running ()"><code class="function">g_main_loop_is_running()</code></a> instead</p>
 </div>
 <p>Checks if the main loop is running.</p>
 <div class="refsect3">
 <a name="g-main-is-running.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>loop</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-is-running.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the main loop is running</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-new"></a><h3>g_main_context_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_context_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> structure.</p>
 <div class="refsect3">
 <a name="g-main-context-new.returns"></a><h4>Returns</h4>
 <p> the new <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-ref"></a><h3>g_main_context_ref ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_context_ref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Increases the reference count on a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> object by one.</p>
 <div class="refsect3">
 <a name="g-main-context-ref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-ref.returns"></a><h4>Returns</h4>
 <p> the <em class="parameter"><code>context</code></em>
 that was passed in (since 2.6)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-unref"></a><h3>g_main_context_unref ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_unref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Decreases the reference count on a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> object by one. If
 the result is zero, free the context and free all associated memory.</p>
 <div class="refsect3">
 <a name="g-main-context-unref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-default"></a><h3>g_main_context_default ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_context_default (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Returns the global default main context. This is the main context
 used for main loop functions when a main loop is not explicitly
 specified, and corresponds to the "main" main loop. See also
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-thread-default" title="g_main_context_get_thread_default ()"><code class="function">g_main_context_get_thread_default()</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-context-default.returns"></a><h4>Returns</h4>
 <p> the global default main context. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-iteration"></a><h3>g_main_context_iteration ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_iteration (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                           <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> may_block</code></em>);</pre>
 <p>Runs a single iteration for the given main loop. This involves
 checking to see if any event sources are ready to be processed,
 then if no events sources are ready and <em class="parameter"><code>may_block</code></em>
  is <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>, waiting
 for a source to become ready, then dispatching the highest priority
 events sources that are ready. Otherwise, if <em class="parameter"><code>may_block</code></em>
  is <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>
 sources are not waited to become ready, only those highest priority
 events sources will be dispatched (if any), that are ready at this
 given moment without further waiting.</p>
 <p>Note that even when <em class="parameter"><code>may_block</code></em>
  is <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>, it is still possible for
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a> to return <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, since the wait may
 be interrupted for other reasons than an event source becoming ready.</p>
 <div class="refsect3">
 <a name="g-main-context-iteration.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>may_block</p></td>
 <td class="parameter_description"><p>whether the call may block.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-iteration.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if events were dispatched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-iteration"></a><h3>g_main_iteration()</h3>
 <pre class="programlisting">#define             g_main_iteration(may_block)</pre>
 <div class="warning">
 <p><code class="literal">g_main_iteration</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a> instead.</p>
 </div>
 <p>Runs a single iteration for the default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>.</p>
 <div class="refsect3">
 <a name="g-main-iteration.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>may_block</p></td>
 <td class="parameter_description"><p>set to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if it should block (i.e. wait) until an event
 source becomes ready. It will return after an event source has been
 processed. If set to <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> it will return immediately if no event
 source is ready to be processed.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-iteration.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if more events are pending.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-pending"></a><h3>g_main_context_pending ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_pending (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Checks if any sources have pending events for the given context.</p>
 <div class="refsect3">
 <a name="g-main-context-pending.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-pending.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if events are pending.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-pending"></a><h3>g_main_pending</h3>
 <pre class="programlisting">#define             g_main_pending()</pre>
 <div class="warning"><p><code class="literal">g_main_pending</code> is deprecated and should not be used in newly-written code.</p></div>
 <p>Checks if any events are pending for the default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 (i.e. ready to be processed).</p>
 <div class="refsect3">
 <a name="g-main-pending.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if any events are pending.</p>
 <p>Deprected: 2.2: Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pending" title="g_main_context_pending ()"><code class="function">g_main_context_pending()</code></a> instead.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-find-source-by-id"></a><h3>g_main_context_find_source_by_id ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_main_context_find_source_by_id (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                                   <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> source_id</code></em>);</pre>
 <p>Finds a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> given a pair of context and ID.</p>
 <p>It is a programmer error to attempt to lookup a non-existent source.</p>
 <p>More specifically: source IDs can be reissued after a source has been
 destroyed and therefore it is never valid to use this function with a
 source ID which may have already been removed.  An example is when
 scheduling an idle to run in another thread with <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>: the
 idle may already have run and been removed by the time this function
 is called on its (now invalid) source ID.  This source ID may have
 been reissued, leading to the operation being performed against the
 wrong source.</p>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-id.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>source_id</p></td>
 <td class="parameter_description"><p>the source ID, as returned by <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-id" title="g_source_get_id ()"><code class="function">g_source_get_id()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-id.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-find-source-by-user-data"></a><h3>g_main_context_find_source_by_user_data ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_main_context_find_source_by_user_data
                                (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                                 <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Finds a source with the given user data for the callback.  If
 multiple sources exist with the same user data, the first
 one found will be returned.</p>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-user-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>the user_data for the callback.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-user-data.returns"></a><h4>Returns</h4>
 <p> the source, if one was found, otherwise <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-find-source-by-funcs-user-data"></a><h3>g_main_context_find_source_by_funcs_user_data ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_main_context_find_source_by_funcs_user_data
                                (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                                 <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> *funcs</code></em>,
                                 <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Finds a source with the given source functions and user data.  If
 multiple sources exist with the same source function and user data,
 the first one found will be returned.</p>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-funcs-user-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>funcs</p></td>
 <td class="parameter_description"><p>the <em class="parameter"><code>source_funcs</code></em>
 passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-source-new" title="g_source_new ()"><code class="function">g_source_new()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>the user data from the callback.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-find-source-by-funcs-user-data.returns"></a><h4>Returns</h4>
 <p> the source, if one was found, otherwise <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-wakeup"></a><h3>g_main_context_wakeup ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_wakeup (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>If <em class="parameter"><code>context</code></em>
  is currently blocking in <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a>
 waiting for a source to become ready, cause it to stop blocking
 and return.  Otherwise, cause the next invocation of
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a> to return without blocking.</p>
 <p>This API is useful for low-level control over <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>; for
 example, integrating it with main loop implementations such as
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a>.</p>
 <p>Another related use for this function is when implementing a main
 loop with a termination condition, computed from multiple threads:</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="preproc">#define</span><span class="normal"> NUM_TASKS </span><span class="number">10</span>
 <span class="keyword">static</span><span class="normal"> </span><span class="keyword">volatile</span><span class="normal"> </span><span class="usertype">gint</span><span class="normal"> tasks_remaining </span><span class="symbol">=</span><span class="normal"> NUM_TASKS</span><span class="symbol">;</span>
 <span class="symbol">...</span>
 <span class="normal"> </span>
 <span class="keyword">while</span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-Atomic-Operations.html#g-atomic-int-get">g_atomic_int_get</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">tasks_remaining</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">!=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">)</span>
 <span class="normal">  </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-context-iteration">g_main_context_iteration</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> <a href="glib-Standard-Macros.html#TRUE:CAPS">TRUE</a></span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <p>Then in a thread:</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="function">perform_work</span><span class="symbol">();</span>

 <span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-Atomic-Operations.html#g-atomic-int-dec-and-test">g_atomic_int_dec_and_test</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">tasks_remaining</span><span class="symbol">))</span>
 <span class="normal">  </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-context-wakeup">g_main_context_wakeup</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <div class="refsect3">
 <a name="g-main-context-wakeup.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-acquire"></a><h3>g_main_context_acquire ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_acquire (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Tries to become the owner of the specified context.
 If some other thread is the owner of the context,
 returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> immediately. Ownership is properly
 recursive: the owner can require ownership again
 and will release ownership when <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-release" title="g_main_context_release ()"><code class="function">g_main_context_release()</code></a>
 is called as many times as <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a>.</p>
 <p>You must be the owner of a context before you
 can call <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-prepare" title="g_main_context_prepare ()"><code class="function">g_main_context_prepare()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()"><code class="function">g_main_context_query()</code></a>,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-check" title="g_main_context_check ()"><code class="function">g_main_context_check()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-dispatch" title="g_main_context_dispatch ()"><code class="function">g_main_context_dispatch()</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-context-acquire.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-acquire.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the operation succeeded, and
 this thread is now the owner of <em class="parameter"><code>context</code></em>
 .</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-release"></a><h3>g_main_context_release ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_release (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Releases ownership of a context previously acquired by this thread
 with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a>. If the context was acquired multiple
 times, the ownership will be released only when <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-release" title="g_main_context_release ()"><code class="function">g_main_context_release()</code></a>
 is called as many times as it was acquired.</p>
 <div class="refsect3">
 <a name="g-main-context-release.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-is-owner"></a><h3>g_main_context_is_owner ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_is_owner (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Determines whether this thread holds the (recursive)
 ownership of this <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>. This is useful to
 know before waiting on another thread that may be
 blocking to get ownership of <em class="parameter"><code>context</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-main-context-is-owner.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-is-owner.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if current thread is owner of <em class="parameter"><code>context</code></em>
 .</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-10.html#api-index-2.10">2.10</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-wait"></a><h3>g_main_context_wait ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_wait (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Threads.html#GCond" title="struct GCond"><span class="type">GCond</span></a> *cond</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Threads.html#GMutex" title="union GMutex"><span class="type">GMutex</span></a> *mutex</code></em>);</pre>
 <p>Tries to become the owner of the specified context,
 as with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a>. But if another thread
 is the owner, atomically drop <em class="parameter"><code>mutex</code></em>
  and wait on <em class="parameter"><code>cond</code></em>
  until
 that owner releases ownership or until <em class="parameter"><code>cond</code></em>
  is signaled, then
 try again (once) to become the owner.</p>
 <div class="refsect3">
 <a name="g-main-context-wait.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>cond</p></td>
 <td class="parameter_description"><p>a condition variable</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>mutex</p></td>
 <td class="parameter_description"><p>a mutex, currently held</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-wait.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the operation succeeded, and
 this thread is now the owner of <em class="parameter"><code>context</code></em>
 .</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-prepare"></a><h3>g_main_context_prepare ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_main_context_prepare (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> *priority</code></em>);</pre>
 <p>Prepares to poll sources within a main loop. The resulting information
 for polling is determined by calling <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()"><code class="function">g_main_context_query()</code></a>.</p>
 <p>You must have successfully acquired the context with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a> before you may call this function.</p>
 <div class="refsect3">
 <a name="g-main-context-prepare.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>location to store priority of highest priority
 source already ready.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-prepare.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if some source is ready to be dispatched
 prior to polling.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-query"></a><h3>g_main_context_query ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_main_context_query (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> max_priority</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> *timeout_</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fds</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> n_fds</code></em>);</pre>
 <p>Determines information necessary to poll this main loop.</p>
 <p>You must have successfully acquired the context with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a> before you may call this function.</p>
 <div class="refsect3">
 <a name="g-main-context-query.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>max_priority</p></td>
 <td class="parameter_description"><p>maximum priority source to check</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timeout_</p></td>
 <td class="parameter_description"><p> location to store timeout to be used in polling. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fds</p></td>
 <td class="parameter_description"><p> location to
 store <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> records that need to be polled. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_fds]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_fds</p></td>
 <td class="parameter_description"><p> length of <em class="parameter"><code>fds</code></em>
 . </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input. Default is transfer none."><span class="acronym">in</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-query.returns"></a><h4>Returns</h4>
 <p> the number of records actually stored in <em class="parameter"><code>fds</code></em>
 ,
 or, if more than <em class="parameter"><code>n_fds</code></em>
 records need to be stored, the number
 of records that need to be stored.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-check"></a><h3>g_main_context_check ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_main_context_check (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> max_priority</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fds</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> n_fds</code></em>);</pre>
 <p>Passes the results of polling back to the main loop.</p>
 <p>You must have successfully acquired the context with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a> before you may call this function.</p>
 <div class="refsect3">
 <a name="g-main-context-check.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>max_priority</p></td>
 <td class="parameter_description"><p>the maximum numerical priority of sources to check</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fds</p></td>
 <td class="parameter_description"><p> array of <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a>'s that was passed to
 the last call to <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()"><code class="function">g_main_context_query()</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_fds]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_fds</p></td>
 <td class="parameter_description"><p>return value of <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-query" title="g_main_context_query ()"><code class="function">g_main_context_query()</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-check.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if some sources are ready to be dispatched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-dispatch"></a><h3>g_main_context_dispatch ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_dispatch (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Dispatches all pending sources.</p>
 <p>You must have successfully acquired the context with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a> before you may call this function.</p>
 <div class="refsect3">
 <a name="g-main-context-dispatch.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-set-poll-func"></a><h3>g_main_context_set_poll_func ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_set_poll_func (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                               <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFunc" title="GPollFunc ()"><span class="type">GPollFunc</span></a> func</code></em>);</pre>
 <p>Sets the function to use to handle polling of file descriptors. It
 will be used instead of the <code class="function">poll()</code> system call
 (or GLib's replacement function, which is used where
 <code class="function">poll()</code> isn't available).</p>
 <p>This function could possibly be used to integrate the GLib event
 loop with an external event loop.</p>
 <div class="refsect3">
 <a name="g-main-context-set-poll-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>the function to call to poll all file descriptors</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-get-poll-func"></a><h3>g_main_context_get_poll_func ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GPollFunc" title="GPollFunc ()"><span class="returnvalue">GPollFunc</span></a>
 g_main_context_get_poll_func (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Gets the poll function set by <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-set-poll-func" title="g_main_context_set_poll_func ()"><code class="function">g_main_context_set_poll_func()</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-context-get-poll-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-main-context-get-poll-func.returns"></a><h4>Returns</h4>
 <p> the poll function</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GPollFunc"></a><h3>GPollFunc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 <span class="c_punctuation">(</span>*GPollFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *ufds</code></em>,
               <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> nfsd</code></em>,
               <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> timeout_</code></em>);</pre>
 <p>Specifies the type of function passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-set-poll-func" title="g_main_context_set_poll_func ()"><code class="function">g_main_context_set_poll_func()</code></a>.
 The semantics of the function should match those of the <code class="function">poll()</code> system call.</p>
 <div class="refsect3">
 <a name="GPollFunc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>ufds</p></td>
 <td class="parameter_description"><p>an array of <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> elements</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>nfsd</p></td>
 <td class="parameter_description"><p>the number of elements in <em class="parameter"><code>ufds</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timeout_</p></td>
 <td class="parameter_description"><p>the maximum time to wait for an event of the file descriptors.
 A negative value indicates an infinite timeout.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="GPollFunc.returns"></a><h4>Returns</h4>
 <p> the number of <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> elements which have events or errors
 reported, or -1 if an error occurred.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-add-poll"></a><h3>g_main_context_add_poll ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_add_poll (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fd</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>);</pre>
 <p>Adds a file descriptor to the set of file descriptors polled for
 this context. This will very seldom be used directly. Instead
 a typical event source will use <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a> instead.</p>
 <div class="refsect3">
 <a name="g-main-context-add-poll.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> for the default context). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fd</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> structure holding information about a file
 descriptor to watch.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority for this file descriptor which should be
 the same as the priority used for <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> to ensure that the
 file descriptor is polled whenever the results may be needed.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-remove-poll"></a><h3>g_main_context_remove_poll ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_remove_poll (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fd</code></em>);</pre>
 <p>Removes file descriptor from the set of file descriptors to be
 polled for a particular context.</p>
 <div class="refsect3">
 <a name="g-main-context-remove-poll.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fd</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> descriptor previously added with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-add-poll" title="g_main_context_add_poll ()"><code class="function">g_main_context_add_poll()</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-depth"></a><h3>g_main_depth ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_main_depth (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Returns the depth of the stack of calls to
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-dispatch" title="g_main_context_dispatch ()"><code class="function">g_main_context_dispatch()</code></a> on any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> in the current thread.
  That is, when called from the toplevel, it gives 0. When
 called from within a callback from <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a>
 (or <a class="link" href="glib-The-Main-Event-Loop.html#g-main-loop-run" title="g_main_loop_run ()"><code class="function">g_main_loop_run()</code></a>, etc.) it returns 1. When called from within
 a callback to a recursive call to <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-iteration" title="g_main_context_iteration ()"><code class="function">g_main_context_iteration()</code></a>,
 it returns 2. And so forth.</p>
 <p>This function is useful in a situation like the following:
 Imagine an extremely simple "garbage collected" system.</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> </span><span class="usertype">GList</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">free_list</span><span class="symbol">;</span>

 <span class="normal"><a href="glib-Basic-Types.html#gpointer">gpointer</a></span>
 <span class="function">allocate_memory</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gsize</span><span class="normal"> size</span><span class="symbol">)</span>
 <span class="cbracket">{</span><span class="normal"> </span>
 <span class="normal">  </span><span class="usertype">gpointer</span><span class="normal"> result </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Memory-Allocation.html#g-malloc">g_malloc</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">size</span><span class="symbol">);</span>
 <span class="normal">  free_list </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Doubly-Linked-Lists.html#g-list-prepend">g_list_prepend</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">free_list</span><span class="symbol">,</span><span class="normal"> result</span><span class="symbol">);</span>
 <span class="normal">  </span><span class="keyword">return</span><span class="normal"> result</span><span class="symbol">;</span>
 <span class="cbracket">}</span>

 <span class="type">void</span>
 <span class="function">free_allocated_memory</span><span class="normal"> </span><span class="symbol">(</span><span class="type">void</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  </span><span class="usertype">GList</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">l</span><span class="symbol">;</span>
 <span class="normal">  </span><span class="keyword">for</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">l </span><span class="symbol">=</span><span class="normal"> free_list</span><span class="symbol">;</span><span class="normal"> l</span><span class="symbol">;</span><span class="normal"> l </span><span class="symbol">=</span><span class="normal"> l</span><span class="symbol">-&gt;</span><span class="normal">next</span><span class="symbol">);</span>
 <span class="normal">    </span><span class="function"><a href="glib-Memory-Allocation.html#g-free">g_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">l</span><span class="symbol">-&gt;</span><span class="normal">data</span><span class="symbol">);</span>
 <span class="normal">  </span><span class="function"><a href="glib-Doubly-Linked-Lists.html#g-list-free">g_list_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">free_list</span><span class="symbol">);</span>
 <span class="normal">  free_list </span><span class="symbol">=</span><span class="normal"> <a href="glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
 <span class="normal"> </span><span class="cbracket">}</span>

 <span class="symbol">[...]</span>

 <span class="keyword">while</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-Standard-Macros.html#TRUE:CAPS">TRUE</a></span><span class="symbol">);</span><span class="normal"> </span>
 <span class="normal"> </span><span class="cbracket">{</span>
 <span class="normal">   </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-context-iteration">g_main_context_iteration</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> <a href="glib-Standard-Macros.html#TRUE:CAPS">TRUE</a></span><span class="symbol">);</span>
 <span class="normal">   </span><span class="function">free_allocated_memory</span><span class="symbol">();</span>
 <span class="normal">  </span><span class="cbracket">}</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <p>This works from an application, however, if you want to do the same
 thing from a library, it gets more difficult, since you no longer
 control the main loop. You might think you can simply use an idle
 function to make the call to <code class="function">free_allocated_memory()</code>, but that
 doesn't work, since the idle function could be called from a
 recursive callback. This can be fixed by using <a class="link" href="glib-The-Main-Event-Loop.html#g-main-depth" title="g_main_depth ()"><code class="function">g_main_depth()</code></a></p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="normal"><a href="glib-Basic-Types.html#gpointer">gpointer</a></span>
 <span class="function">allocate_memory</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gsize</span><span class="normal"> size</span><span class="symbol">)</span>
 <span class="cbracket">{</span><span class="normal"> </span>
 <span class="normal">  </span><span class="usertype">FreeListBlock</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">block </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Memory-Allocation.html#g-new">g_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">FreeListBlock</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1</span><span class="symbol">);</span>
 <span class="normal">  block</span><span class="symbol">-&gt;</span><span class="normal">mem </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Memory-Allocation.html#g-malloc">g_malloc</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">size</span><span class="symbol">);</span>
 <span class="normal">  block</span><span class="symbol">-&gt;</span><span class="normal">depth </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-depth">g_main_depth</a></span><span class="normal"> </span><span class="symbol">();</span><span class="normal">   </span>
 <span class="normal">  free_list </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Doubly-Linked-Lists.html#g-list-prepend">g_list_prepend</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">free_list</span><span class="symbol">,</span><span class="normal"> block</span><span class="symbol">);</span>
 <span class="normal">  </span><span class="keyword">return</span><span class="normal"> block</span><span class="symbol">-&gt;</span><span class="normal">mem</span><span class="symbol">;</span>
 <span class="cbracket">}</span>

 <span class="type">void</span>
 <span class="function">free_allocated_memory</span><span class="normal"> </span><span class="symbol">(</span><span class="type">void</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  </span><span class="usertype">GList</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">l</span><span class="symbol">;</span>
 <span class="normal">  </span>
 <span class="normal">  </span><span class="type">int</span><span class="normal"> depth </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-depth">g_main_depth</a></span><span class="normal"> </span><span class="symbol">();</span>
 <span class="normal">  </span><span class="keyword">for</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">l </span><span class="symbol">=</span><span class="normal"> free_list</span><span class="symbol">;</span><span class="normal"> l</span><span class="symbol">;</span><span class="normal"> </span><span class="symbol">);</span>
 <span class="normal">    </span><span class="cbracket">{</span>
 <span class="normal">      </span><span class="usertype">GList</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">next </span><span class="symbol">=</span><span class="normal"> l</span><span class="symbol">-&gt;</span><span class="normal">next</span><span class="symbol">;</span>
 <span class="normal">      </span><span class="usertype">FreeListBlock</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">block </span><span class="symbol">=</span><span class="normal"> l</span><span class="symbol">-&gt;</span><span class="normal">data</span><span class="symbol">;</span>
 <span class="normal">      </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">block</span><span class="symbol">-&gt;</span><span class="normal">depth </span><span class="symbol">&gt;</span><span class="normal"> depth</span><span class="symbol">)</span>
 <span class="normal">        </span><span class="cbracket">{</span>
 <span class="normal">          </span><span class="function"><a href="glib-Memory-Allocation.html#g-free">g_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">block</span><span class="symbol">-&gt;</span><span class="normal">mem</span><span class="symbol">);</span>
 <span class="normal">          </span><span class="function"><a href="glib-Memory-Allocation.html#g-free">g_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">block</span><span class="symbol">);</span>
 <span class="normal">          free_list </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-Doubly-Linked-Lists.html#g-list-delete-link">g_list_delete_link</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">free_list</span><span class="symbol">,</span><span class="normal"> l</span><span class="symbol">);</span>
 <span class="normal">        </span><span class="cbracket">}</span>
 <span class="normal">              </span>
 <span class="normal">      l </span><span class="symbol">=</span><span class="normal"> next</span><span class="symbol">;</span>
 <span class="normal">    </span><span class="cbracket">}</span>
 <span class="normal">  </span><span class="cbracket">}</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <p>There is a temptation to use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-depth" title="g_main_depth ()"><code class="function">g_main_depth()</code></a> to solve
 problems with reentrancy. For instance, while waiting for data
 to be received from the network in response to a menu item,
 the menu item might be selected again. It might seem that
 one could make the menu item's callback return immediately
 and do nothing if <a class="link" href="glib-The-Main-Event-Loop.html#g-main-depth" title="g_main_depth ()"><code class="function">g_main_depth()</code></a> returns a value greater than 1.
 However, this should be avoided since the user then sees selecting
 the menu item do nothing. Furthermore, you'll find yourself adding
 these checks all over your code, since there are doubtless many,
 many things that the user could do. Instead, you can use the
 following techniques:</p>
 <div class="orderedlist"><ol class="orderedlist" type="1">
 <li class="listitem"><p>Use <a href="http://developer.gnome.org/gtk3/GtkWidget.html#gtk-widget-set-sensitive"><code class="function">gtk_widget_set_sensitive()</code></a> or modal dialogs to prevent
 the user from interacting with elements while the main
 loop is recursing.</p></li>
 <li class="listitem"><p>Avoid main loop recursion in situations where you can't handle
 arbitrary  callbacks. Instead, structure your code so that you
 simply return to the main loop and then get called again when
 there is more work to do.</p></li>
 </ol></div>
 <div class="refsect3">
 <a name="g-main-depth.returns"></a><h4>Returns</h4>
 <p> The main loop recursion level in the current thread</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-current-source"></a><h3>g_main_current_source ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_main_current_source (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Returns the currently firing source for this thread.</p>
 <div class="refsect3">
 <a name="g-main-current-source.returns"></a><h4>Returns</h4>
 <p> The currently firing source or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-12.html#api-index-2.12">2.12</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-set-poll-func"></a><h3>g_main_set_poll_func()</h3>
 <pre class="programlisting">#define             g_main_set_poll_func(func)</pre>
 <div class="warning">
 <p><code class="literal">g_main_set_poll_func</code> has been deprecated since version 2.2 and should not be used in newly-written code.</p>
 <p>Use <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-set-poll-func" title="g_main_context_set_poll_func ()"><code class="function">g_main_context_set_poll_func()</code></a> again</p>
 </div>
 <p>Sets the function to use for the handle polling of file descriptors
 for the default main context.</p>
 <div class="refsect3">
 <a name="g-main-set-poll-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>the function to call to poll all file descriptors</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-invoke"></a><h3>g_main_context_invoke ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_invoke (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Invokes a function in such a way that <em class="parameter"><code>context</code></em>
  is owned during the
 invocation of <em class="parameter"><code>function</code></em>
 .</p>
 <p>If <em class="parameter"><code>context</code></em>
  is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then the global default main context — as
 returned by <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-default" title="g_main_context_default ()"><code class="function">g_main_context_default()</code></a> — is used.</p>
 <p>If <em class="parameter"><code>context</code></em>
  is owned by the current thread, <em class="parameter"><code>function</code></em>
  is called
 directly.  Otherwise, if <em class="parameter"><code>context</code></em>
  is the thread-default main context
 of the current thread and <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-acquire" title="g_main_context_acquire ()"><code class="function">g_main_context_acquire()</code></a> succeeds, then
 <em class="parameter"><code>function</code></em>
  is called and <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-release" title="g_main_context_release ()"><code class="function">g_main_context_release()</code></a> is called
 afterwards.</p>
 <p>In any other case, an idle source is created to call <em class="parameter"><code>function</code></em>
  and
 that source is attached to <em class="parameter"><code>context</code></em>
  (presumably to be run in another
 thread).  The idle source is attached with <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a>
 priority.  If you want a different priority, use
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-invoke-full" title="g_main_context_invoke_full ()"><code class="function">g_main_context_invoke_full()</code></a>.</p>
 <p>Note that, as with normal idle functions, <em class="parameter"><code>function</code></em>
  should probably
 return <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>.  If it returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>, it will be continuously run in a
 loop (and may prevent this call from returning).</p>
 <div class="refsect3">
 <a name="g-main-context-invoke.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-invoke-full"></a><h3>g_main_context_invoke_full ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_invoke_full (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Invokes a function in such a way that <em class="parameter"><code>context</code></em>
  is owned during the
 invocation of <em class="parameter"><code>function</code></em>
 .</p>
 <p>This function is the same as <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-invoke" title="g_main_context_invoke ()"><code class="function">g_main_context_invoke()</code></a> except that it
 lets you specify the priority incase <em class="parameter"><code>function</code></em>
  ends up being
 scheduled as an idle and also lets you give a <a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> for <em class="parameter"><code>data</code></em>
 .</p>
 <p><em class="parameter"><code>notify</code></em>
  should not assume that it is called from any particular
 thread or with any particular context acquired.</p>
 <div class="refsect3">
 <a name="g-main-context-invoke-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority at which to run <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> a function to call when <em class="parameter"><code>data</code></em>
 is no longer in use, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-get-thread-default"></a><h3>g_main_context_get_thread_default ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_context_get_thread_default (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Gets the thread-default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> for this thread. Asynchronous
 operations that want to be able to be run in contexts other than
 the default one should call this method or
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-ref-thread-default" title="g_main_context_ref_thread_default ()"><code class="function">g_main_context_ref_thread_default()</code></a> to get a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> to add
 their <a href="glib-The-Main-Event-Loop.html#GSource"><span class="type">GSources</span></a> to. (Note that even in single-threaded
 programs applications may sometimes want to temporarily push a
 non-default context, so it is not safe to assume that this will
 always return <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> if you are running in the default thread.)</p>
 <p>If you need to hold a reference on the context, use
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-ref-thread-default" title="g_main_context_ref_thread_default ()"><code class="function">g_main_context_ref_thread_default()</code></a> instead.</p>
 <div class="refsect3">
 <a name="g-main-context-get-thread-default.returns"></a><h4>Returns</h4>
 <p> the thread-default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, or
 <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> if the thread-default context is the global default context. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-ref-thread-default"></a><h3>g_main_context_ref_thread_default ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_main_context_ref_thread_default (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Gets the thread-default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> for this thread, as with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-thread-default" title="g_main_context_get_thread_default ()"><code class="function">g_main_context_get_thread_default()</code></a>, but also adds a reference to
 it with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-ref" title="g_main_context_ref ()"><code class="function">g_main_context_ref()</code></a>. In addition, unlike
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-thread-default" title="g_main_context_get_thread_default ()"><code class="function">g_main_context_get_thread_default()</code></a>, if the thread-default context
 is the global default context, this will return that <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 (with a ref added to it) rather than returning <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-context-ref-thread-default.returns"></a><h4>Returns</h4>
 <p> the thread-default <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>. Unref
 with <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-unref" title="g_main_context_unref ()"><code class="function">g_main_context_unref()</code></a> when you are done with it. </p>
 <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-32.html#api-index-2.32">2.32</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-push-thread-default"></a><h3>g_main_context_push_thread_default ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_push_thread_default (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Acquires <em class="parameter"><code>context</code></em>
  and sets it as the thread-default context for the
 current thread. This will cause certain asynchronous operations
 (such as most gio-based I/O) which are
 started in this thread to run under <em class="parameter"><code>context</code></em>
  and deliver their
 results to its main loop, rather than running under the global
 default context in the main thread. Note that calling this function
 changes the context returned by <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-get-thread-default" title="g_main_context_get_thread_default ()"><code class="function">g_main_context_get_thread_default()</code></a>,
 not the one returned by <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-default" title="g_main_context_default ()"><code class="function">g_main_context_default()</code></a>, so it does not affect
 the context used by functions like <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>.</p>
 <p>Normally you would call this function shortly after creating a new
 thread, passing it a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> which will be run by a
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainLoop" title="GMainLoop"><span class="type">GMainLoop</span></a> in that thread, to set a new default context for all
 async operations in that thread. In this case you may not need to
 ever call <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pop-thread-default" title="g_main_context_pop_thread_default ()"><code class="function">g_main_context_pop_thread_default()</code></a>, assuming you want the
 new <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> to be the default for the whole lifecycle of the
 thread.</p>
 <p>If you don't have control over how the new thread was created (e.g.
 in the new thread isn't newly created, or if the thread life
 cycle is managed by a <a class="link" href="glib-Thread-Pools.html#GThreadPool" title="struct GThreadPool"><span class="type">GThreadPool</span></a>), it is always suggested to wrap
 the logic that needs to use the new <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> inside a
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-push-thread-default" title="g_main_context_push_thread_default ()"><code class="function">g_main_context_push_thread_default()</code></a> / <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pop-thread-default" title="g_main_context_pop_thread_default ()"><code class="function">g_main_context_pop_thread_default()</code></a>
 pair, otherwise threads that are re-used will end up never explicitly
 releasing the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> reference they hold.</p>
 <p>In some cases you may want to schedule a single operation in a
 non-default context, or temporarily use a non-default context in
 the main thread. In that case, you can wrap the call to the
 asynchronous operation inside a
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-push-thread-default" title="g_main_context_push_thread_default ()"><code class="function">g_main_context_push_thread_default()</code></a> /
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-pop-thread-default" title="g_main_context_pop_thread_default ()"><code class="function">g_main_context_pop_thread_default()</code></a> pair, but it is up to you to
 ensure that no other asynchronous operations accidentally get
 started while the non-default context is active.</p>
 <p>Beware that libraries that predate this function may not correctly
 handle being used from a thread with a thread-default context. Eg,
 see <a href="https://developer.gnome.org/gio/unstable/GFile.html#g-file-supports-thread-contexts"><code class="function">g_file_supports_thread_contexts()</code></a>.</p>
 <div class="refsect3">
 <a name="g-main-context-push-thread-default.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> for the global default context. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-main-context-pop-thread-default"></a><h3>g_main_context_pop_thread_default ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_main_context_pop_thread_default (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Pops <em class="parameter"><code>context</code></em>
  off the thread-default context stack (verifying that
 it was on the top of the stack).</p>
 <div class="refsect3">
 <a name="g-main-context-pop-thread-default.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> object, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-source-new"></a><h3>g_timeout_source_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_timeout_source_new (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>);</pre>
 <p>Creates a new timeout source.</p>
 <p>The source will not initially be associated with any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 and must be added to one with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> before it will be
 executed.</p>
 <p>The interval given is in terms of monotonic time, not wall clock
 time.  See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-timeout-source-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the timeout interval in milliseconds.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-source-new.returns"></a><h4>Returns</h4>
 <p> the newly-created timeout source</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-source-new-seconds"></a><h3>g_timeout_source_new_seconds ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_timeout_source_new_seconds (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>);</pre>
 <p>Creates a new timeout source.</p>
 <p>The source will not initially be associated with any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 and must be added to one with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> before it will be
 executed.</p>
 <p>The scheduling granularity/accuracy of this timeout source will be
 in seconds.</p>
 <p>The interval given in terms of monotonic time, not wall clock time.
 See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-timeout-source-new-seconds.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the timeout interval in seconds</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-source-new-seconds.returns"></a><h4>Returns</h4>
 <p> the newly-created timeout source</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-14.html#api-index-2.14">2.14</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-add"></a><h3>g_timeout_add ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_timeout_add (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>,
                <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Sets a function to be called at regular intervals, with the default
 priority, <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a>.  The function is called repeatedly
 until it returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, at which point the timeout is automatically
 destroyed and the function will not be called again.  The first call
 to the function will be at the end of the first <em class="parameter"><code>interval</code></em>
 .</p>
 <p>Note that timeout functions may be delayed, due to the processing of other
 event sources. Thus they should not be relied on for precise timing.
 After each call to the timeout function, the time of the next
 timeout is recalculated based on the current time and the given interval
 (it does not try to 'catch up' time lost in delays).</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>If you want to have a timer in the "seconds" range and do not care
 about the exact time of the first call of the timer, use the
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-seconds" title="g_timeout_add_seconds ()"><code class="function">g_timeout_add_seconds()</code></a> function; this function allows for more
 optimizations and more efficient system power usage.</p>
 <p>This internally creates a main loop source using <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new" title="g_timeout_source_new ()"><code class="function">g_timeout_source_new()</code></a>
 and attaches it to the global <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, so
 the callback will be invoked in whichever thread is running that main
 context. You can do these steps manually if you need greater control or to
 use a custom main context.</p>
 <p>The interval given is in terms of monotonic time, not wall clock
 time.  See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-timeout-add.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the time between calls to the function, in milliseconds
 (1/1000ths of a second)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-add.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-add-full"></a><h3>g_timeout_add_full ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_timeout_add_full (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Sets a function to be called at regular intervals, with the given
 priority.  The function is called repeatedly until it returns
 <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, at which point the timeout is automatically destroyed and
 the function will not be called again.  The <em class="parameter"><code>notify</code></em>
  function is
 called when the timeout is destroyed.  The first call to the
 function will be at the end of the first <em class="parameter"><code>interval</code></em>
 .</p>
 <p>Note that timeout functions may be delayed, due to the processing of other
 event sources. Thus they should not be relied on for precise timing.
 After each call to the timeout function, the time of the next
 timeout is recalculated based on the current time and the given interval
 (it does not try to 'catch up' time lost in delays).</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>This internally creates a main loop source using <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new" title="g_timeout_source_new ()"><code class="function">g_timeout_source_new()</code></a>
 and attaches it to the global <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, so
 the callback will be invoked in whichever thread is running that main
 context. You can do these steps manually if you need greater control or to
 use a custom main context.</p>
 <p>The interval given in terms of monotonic time, not wall clock time.
 See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> g_timeout_add]</span></p>
 <div class="refsect3">
 <a name="g-timeout-add-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority of the timeout source. Typically this will be in
 the range between <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a> and <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH:CAPS" title="G_PRIORITY_HIGH"><span class="type">G_PRIORITY_HIGH</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the time between calls to the function, in milliseconds
 (1/1000ths of a second)</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> function to call when the timeout is removed, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-add-full.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-add-seconds"></a><h3>g_timeout_add_seconds ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_timeout_add_seconds (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Sets a function to be called at regular intervals with the default
 priority, <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a>. The function is called repeatedly until
 it returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, at which point the timeout is automatically destroyed
 and the function will not be called again.</p>
 <p>This internally creates a main loop source using
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new-seconds" title="g_timeout_source_new_seconds ()"><code class="function">g_timeout_source_new_seconds()</code></a> and attaches it to the main loop context
 using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>. You can do these steps manually if you need
 greater control. Also see <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-seconds-full" title="g_timeout_add_seconds_full ()"><code class="function">g_timeout_add_seconds_full()</code></a>.</p>
 <p>Note that the first call of the timer may not be precise for timeouts
 of one second. If you need finer precision and have such a timeout,
 you may want to use <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a> instead.</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>The interval given is in terms of monotonic time, not wall clock
 time.  See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-timeout-add-seconds.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the time between calls to the function, in seconds</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-add-seconds.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-14.html#api-index-2.14">2.14</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-timeout-add-seconds-full"></a><h3>g_timeout_add_seconds_full ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_timeout_add_seconds_full (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> interval</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                             <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Sets a function to be called at regular intervals, with <em class="parameter"><code>priority</code></em>
 .
 The function is called repeatedly until it returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, at which
 point the timeout is automatically destroyed and the function will
 not be called again.</p>
 <p>Unlike <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>, this function operates at whole second granularity.
 The initial starting point of the timer is determined by the implementation
 and the implementation is expected to group multiple timers together so that
 they fire all at the same time.
 To allow this grouping, the <em class="parameter"><code>interval</code></em>
  to the first timer is rounded
 and can deviate up to one second from the specified interval.
 Subsequent timer iterations will generally run at the specified interval.</p>
 <p>Note that timeout functions may be delayed, due to the processing of other
 event sources. Thus they should not be relied on for precise timing.
 After each call to the timeout function, the time of the next
 timeout is recalculated based on the current time and the given <em class="parameter"><code>interval</code></em>
 </p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>If you want timing more precise than whole seconds, use <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>
 instead.</p>
 <p>The grouping of timers to fire at the same time results in a more power
 and CPU efficient behavior so if your timer is in multiples of seconds
 and you don't require the first timer exactly one second from now, the
 use of <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-seconds" title="g_timeout_add_seconds ()"><code class="function">g_timeout_add_seconds()</code></a> is preferred over <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>.</p>
 <p>This internally creates a main loop source using
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-source-new-seconds" title="g_timeout_source_new_seconds ()"><code class="function">g_timeout_source_new_seconds()</code></a> and attaches it to the main loop context
 using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>. You can do these steps manually if you need
 greater control.</p>
 <p>The interval given is in terms of monotonic time, not wall clock
 time.  See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> g_timeout_add_seconds]</span></p>
 <div class="refsect3">
 <a name="g-timeout-add-seconds-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority of the timeout source. Typically this will be in
 the range between <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a> and <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH:CAPS" title="G_PRIORITY_HIGH"><span class="type">G_PRIORITY_HIGH</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>interval</p></td>
 <td class="parameter_description"><p>the time between calls to the function, in seconds</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> function to call when the timeout is removed, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-timeout-add-seconds-full.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-14.html#api-index-2.14">2.14</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-idle-source-new"></a><h3>g_idle_source_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_idle_source_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Creates a new idle source.</p>
 <p>The source will not initially be associated with any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 and must be added to one with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> before it will be
 executed. Note that the default priority for idle sources is
 <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT-IDLE:CAPS" title="G_PRIORITY_DEFAULT_IDLE"><code class="literal">G_PRIORITY_DEFAULT_IDLE</code></a>, as compared to other sources which
 have a default priority of <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><code class="literal">G_PRIORITY_DEFAULT</code></a>.</p>
 <div class="refsect3">
 <a name="g-idle-source-new.returns"></a><h4>Returns</h4>
 <p> the newly-created idle source</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-idle-add"></a><h3>g_idle_add ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_idle_add (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
             <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Adds a function to be called whenever there are no higher priority
 events pending to the default main loop. The function is given the
 default idle priority, <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT-IDLE:CAPS" title="G_PRIORITY_DEFAULT_IDLE"><span class="type">G_PRIORITY_DEFAULT_IDLE</span></a>.  If the function
 returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> it is automatically removed from the list of event
 sources and will not be called again.</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>This internally creates a main loop source using <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-source-new" title="g_idle_source_new ()"><code class="function">g_idle_source_new()</code></a>
 and attaches it to the global <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, so
 the callback will be invoked in whichever thread is running that main
 context. You can do these steps manually if you need greater control or to
 use a custom main context.</p>
 <div class="refsect3">
 <a name="g-idle-add.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-idle-add.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-idle-add-full"></a><h3>g_idle_add_full ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_idle_add_full (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> function</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Adds a function to be called whenever there are no higher priority
 events pending.  If the function returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> it is automatically
 removed from the list of event sources and will not be called again.</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>This internally creates a main loop source using <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-source-new" title="g_idle_source_new ()"><code class="function">g_idle_source_new()</code></a>
 and attaches it to the global <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, so
 the callback will be invoked in whichever thread is running that main
 context. You can do these steps manually if you need greater control or to
 use a custom main context.</p>
 <p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> g_idle_add]</span></p>
 <div class="refsect3">
 <a name="g-idle-add-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority of the idle source. Typically this will be in the
 range between <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT-IDLE:CAPS" title="G_PRIORITY_DEFAULT_IDLE"><span class="type">G_PRIORITY_DEFAULT_IDLE</span></a> and <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH-IDLE:CAPS" title="G_PRIORITY_HIGH_IDLE"><span class="type">G_PRIORITY_HIGH_IDLE</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> function to call when the idle is removed, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-idle-add-full.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-idle-remove-by-data"></a><h3>g_idle_remove_by_data ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_idle_remove_by_data (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Removes the idle function with the given data.</p>
 <div class="refsect3">
 <a name="g-idle-remove-by-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>the data for the idle source's callback.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-idle-remove-by-data.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if an idle source was found and removed.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GChildWatchFunc"></a><h3>GChildWatchFunc ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 <span class="c_punctuation">(</span>*GChildWatchFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> pid</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> status</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Prototype of a <span class="type">GChildWatchSource</span> callback, called when a child
 process has exited.  To interpret <em class="parameter"><code>status</code></em>
 , see the documentation
 for <a class="link" href="glib-Spawning-Processes.html#g-spawn-check-exit-status" title="g_spawn_check_exit_status ()"><code class="function">g_spawn_check_exit_status()</code></a>.</p>
 <div class="refsect3">
 <a name="GChildWatchFunc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>pid</p></td>
 <td class="parameter_description"><p>the process id of the child process</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>status</p></td>
 <td class="parameter_description"><p>Status information about the child process, encoded
 in a platform-specific manner</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>user data passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-add" title="g_child_watch_add ()"><code class="function">g_child_watch_add()</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-child-watch-source-new"></a><h3>g_child_watch_source_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_child_watch_source_new (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> pid</code></em>);</pre>
 <p>Creates a new child_watch source.</p>
 <p>The source will not initially be associated with any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 and must be added to one with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> before it will be
 executed.</p>
 <p>Note that child watch sources can only be used in conjunction with
 <code class="literal">g_spawn...</code> when the <a class="link" href="glib-Spawning-Processes.html#G-SPAWN-DO-NOT-REAP-CHILD:CAPS"><code class="literal">G_SPAWN_DO_NOT_REAP_CHILD</code></a> flag is used.</p>
 <p>Note that on platforms where <a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> must be explicitly closed
 (see <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a>) <em class="parameter"><code>pid</code></em>
  must not be closed while the
 source is still active. Typically, you will want to call
 <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a> in the callback function for the source.</p>
 <p>Note further that using <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-source-new" title="g_child_watch_source_new ()"><code class="function">g_child_watch_source_new()</code></a> is not
 compatible with calling <code class="literal">waitpid</code> with a nonpositive first
 argument in the application. Calling <code class="function">waitpid()</code> for individual
 pids will still work fine.</p>
 <p>Similarly, on POSIX platforms, the <em class="parameter"><code>pid</code></em>
  passed to this function must
 be greater than 0 (i.e. this function must wait for a specific child,
 and cannot wait for one of many children by using a nonpositive argument).</p>
 <div class="refsect3">
 <a name="g-child-watch-source-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>pid</p></td>
 <td class="parameter_description"><p>process to watch. On POSIX the positive pid of a child process. On
 Windows a handle for a process (which doesn't have to be a child).</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-child-watch-source-new.returns"></a><h4>Returns</h4>
 <p> the newly-created child watch source</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-child-watch-add"></a><h3>g_child_watch_add ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_child_watch_add (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> pid</code></em>,
                    <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GChildWatchFunc" title="GChildWatchFunc ()"><span class="type">GChildWatchFunc</span></a> function</code></em>,
                    <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Sets a function to be called when the child indicated by <em class="parameter"><code>pid</code></em>

 exits, at a default priority, <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT:CAPS" title="G_PRIORITY_DEFAULT"><span class="type">G_PRIORITY_DEFAULT</span></a>.</p>
 <p>If you obtain <em class="parameter"><code>pid</code></em>
  from <a class="link" href="glib-Spawning-Processes.html#g-spawn-async" title="g_spawn_async ()"><code class="function">g_spawn_async()</code></a> or <a class="link" href="glib-Spawning-Processes.html#g-spawn-async-with-pipes" title="g_spawn_async_with_pipes ()"><code class="function">g_spawn_async_with_pipes()</code></a>
 you will need to pass <a class="link" href="glib-Spawning-Processes.html#G-SPAWN-DO-NOT-REAP-CHILD:CAPS"><span class="type">G_SPAWN_DO_NOT_REAP_CHILD</span></a> as flag to
 the spawn function for the child watching to work.</p>
 <p>Note that on platforms where <a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> must be explicitly closed
 (see <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a>) <em class="parameter"><code>pid</code></em>
  must not be closed while the
 source is still active. Typically, you will want to call
 <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a> in the callback function for the source.</p>
 <p>GLib supports only a single callback per process id.</p>
 <p>This internally creates a main loop source using
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-source-new" title="g_child_watch_source_new ()"><code class="function">g_child_watch_source_new()</code></a> and attaches it to the main loop context
 using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>. You can do these steps manually if you
 need greater control.</p>
 <div class="refsect3">
 <a name="g-child-watch-add.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>pid</p></td>
 <td class="parameter_description"><p>process id to watch. On POSIX the positive pid of a child
 process. On Windows a handle for a process (which doesn't have to be
 a child).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-child-watch-add.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-child-watch-add-full"></a><h3>g_child_watch_add_full ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_child_watch_add_full (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> pid</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GChildWatchFunc" title="GChildWatchFunc ()"><span class="type">GChildWatchFunc</span></a> function</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Sets a function to be called when the child indicated by <em class="parameter"><code>pid</code></em>

 exits, at the priority <em class="parameter"><code>priority</code></em>
 .</p>
 <p>If you obtain <em class="parameter"><code>pid</code></em>
  from <a class="link" href="glib-Spawning-Processes.html#g-spawn-async" title="g_spawn_async ()"><code class="function">g_spawn_async()</code></a> or <a class="link" href="glib-Spawning-Processes.html#g-spawn-async-with-pipes" title="g_spawn_async_with_pipes ()"><code class="function">g_spawn_async_with_pipes()</code></a>
 you will need to pass <a class="link" href="glib-Spawning-Processes.html#G-SPAWN-DO-NOT-REAP-CHILD:CAPS"><span class="type">G_SPAWN_DO_NOT_REAP_CHILD</span></a> as flag to
 the spawn function for the child watching to work.</p>
 <p>In many programs, you will want to call <a class="link" href="glib-Spawning-Processes.html#g-spawn-check-exit-status" title="g_spawn_check_exit_status ()"><code class="function">g_spawn_check_exit_status()</code></a>
 in the callback to determine whether or not the child exited
 successfully.</p>
 <p>Also, note that on platforms where <a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a> must be explicitly closed
 (see <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a>) <em class="parameter"><code>pid</code></em>
  must not be closed while the source
 is still active.  Typically, you should invoke <a class="link" href="glib-Spawning-Processes.html#g-spawn-close-pid" title="g_spawn_close_pid ()"><code class="function">g_spawn_close_pid()</code></a>
 in the callback function for the source.</p>
 <p>GLib supports only a single callback per process id.</p>
 <p>This internally creates a main loop source using
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-source-new" title="g_child_watch_source_new ()"><code class="function">g_child_watch_source_new()</code></a> and attaches it to the main loop context
 using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>. You can do these steps manually if you
 need greater control.</p>
 <p><span class="annotation">[<acronym title="Rename the original symbol's name to SYMBOL."><span class="acronym">rename-to</span></acronym> g_child_watch_add]</span></p>
 <div class="refsect3">
 <a name="g-child-watch-add-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the priority of the idle source. Typically this will be in the
 range between <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-DEFAULT-IDLE:CAPS" title="G_PRIORITY_DEFAULT_IDLE"><span class="type">G_PRIORITY_DEFAULT_IDLE</span></a> and <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH-IDLE:CAPS" title="G_PRIORITY_HIGH_IDLE"><span class="type">G_PRIORITY_HIGH_IDLE</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>pid</p></td>
 <td class="parameter_description"><p>process to watch. On POSIX the positive pid of a child process. On
 Windows a handle for a process (which doesn't have to be a child).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>function</p></td>
 <td class="parameter_description"><p>function to call</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>function</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> function to call when the idle is removed, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-child-watch-add-full.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) of the event source.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-poll"></a><h3>g_poll ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_poll (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fds</code></em>,
         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> nfds</code></em>,
         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> timeout</code></em>);</pre>
 <p>Polls <em class="parameter"><code>fds</code></em>
 , as with the <code class="function">poll()</code> system call, but portably. (On
 systems that don't have <code class="function">poll()</code>, it is emulated using <code class="function">select()</code>.)
 This is used internally by <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, but it can be called
 directly if you need to block until a file descriptor is ready, but
 don't want to run the full main loop.</p>
 <p>Each element of <em class="parameter"><code>fds</code></em>
  is a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> describing a single file
 descriptor to poll. The <code class="literal">fd</code> field indicates the file descriptor,
 and the <code class="literal">events</code> field indicates the events to poll for. On return,
 the <code class="literal">revents</code> fields will be filled with the events that actually
 occurred.</p>
 <p>On POSIX systems, the file descriptors in <em class="parameter"><code>fds</code></em>
  can be any sort of
 file descriptor, but the situation is much more complicated on
 Windows. If you need to use <a class="link" href="glib-The-Main-Event-Loop.html#g-poll" title="g_poll ()"><code class="function">g_poll()</code></a> in code that has to run on
 Windows, the easiest solution is to construct all of your
 <a href="glib-The-Main-Event-Loop.html#GPollFD"><span class="type">GPollFDs</span></a> with <code class="function">g_io_channel_win32_make_pollfd()</code>.</p>
 <div class="refsect3">
 <a name="g-poll.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>fds</p></td>
 <td class="parameter_description"><p>file descriptors to poll</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>nfds</p></td>
 <td class="parameter_description"><p>the number of file descriptors in <em class="parameter"><code>fds</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timeout</p></td>
 <td class="parameter_description"><p>amount of time to wait, in milliseconds, or -1 to wait forever</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-poll.returns"></a><h4>Returns</h4>
 <p> the number of entries in <em class="parameter"><code>fds</code></em>
 whose <code class="literal">revents</code> fields
 were filled in, or 0 if the operation timed out, or -1 on error or
 if the call was interrupted.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-20.html#api-index-2.20">2.20</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSourceDummyMarshal"></a><h3>GSourceDummyMarshal ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 <span class="c_punctuation">(</span>*GSourceDummyMarshal<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>This is just a placeholder for <a href="https://developer.gnome.org/gobject/unstable/gobject-Closures.html#GClosureMarshal"><span class="type">GClosureMarshal</span></a>,
 which cannot be used here for dependency reasons.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-new"></a><h3>g_source_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_source_new (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> *source_funcs</code></em>,
               <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> struct_size</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> structure. The size is specified to
 allow creating structures derived from <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that contain
 additional data. The size passed in must be at least
 <code class="literal">sizeof (GSource)</code>.</p>
 <p>The source will not initially be associated with any <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>
 and must be added to one with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a> before it will be
 executed.</p>
 <div class="refsect3">
 <a name="g-source-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source_funcs</p></td>
 <td class="parameter_description"><p>structure containing functions that implement
 the sources behavior.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>struct_size</p></td>
 <td class="parameter_description"><p>size of the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> structure to create.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-new.returns"></a><h4>Returns</h4>
 <p> the newly-created <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-ref"></a><h3>g_source_ref ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="returnvalue">GSource</span></a> *
 g_source_ref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Increases the reference count on a source by one.</p>
 <div class="refsect3">
 <a name="g-source-ref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-ref.returns"></a><h4>Returns</h4>
 <p> <em class="parameter"><code>source</code></em>
 </p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-unref"></a><h3>g_source_unref ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_unref (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Decreases the reference count of a source by one. If the
 resulting reference count is zero the source and associated
 memory will be destroyed.</p>
 <div class="refsect3">
 <a name="g-source-unref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-funcs"></a><h3>g_source_set_funcs ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_funcs (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                     <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> *funcs</code></em>);</pre>
 <p>Sets the source functions (can be used to override
 default implementations) of an unattached source.</p>
 <div class="refsect3">
 <a name="g-source-set-funcs.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>funcs</p></td>
 <td class="parameter_description"><p>the new <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-12.html#api-index-2.12">2.12</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-attach"></a><h3>g_source_attach ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_source_attach (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> *context</code></em>);</pre>
 <p>Adds a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> to a <em class="parameter"><code>context</code></em>
  so that it will be executed within
 that context. Remove it by calling <a class="link" href="glib-The-Main-Event-Loop.html#g-source-destroy" title="g_source_destroy ()"><code class="function">g_source_destroy()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-attach.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>context</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> (if <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the default context will be used). </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-attach.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) for the source within the
 <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>. </p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-destroy"></a><h3>g_source_destroy ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_destroy (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Removes a source from its <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, if any, and mark it as
 destroyed.  The source cannot be subsequently added to another
 context. It is safe to call this on sources which have already been
 removed from their context.</p>
 <div class="refsect3">
 <a name="g-source-destroy.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-is-destroyed"></a><h3>g_source_is_destroyed ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_source_is_destroyed (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Returns whether <em class="parameter"><code>source</code></em>
  has been destroyed.</p>
 <p>This is important when you operate upon your objects
 from within idle handlers, but may have freed the object
 before the dispatch of your idle handler.</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> <a href="glib-Basic-Types.html#gboolean">gboolean</a> </span>
 <span class="function">idle_callback</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> data</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  </span><span class="usertype">SomeWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">self </span><span class="symbol">=</span><span class="normal"> data</span><span class="symbol">;</span>
 <span class="normal">   </span>
 <span class="normal">  </span><span class="function"><a href="http://developer.gnome.org/gdk3/gdk3-Threads.html#GDK-THREADS-ENTER:CAPS">GDK_THREADS_ENTER</a></span><span class="normal"> </span><span class="symbol">();</span>
 <span class="normal">  </span><span class="comment">// do stuff with self</span>
 <span class="normal">  self</span><span class="symbol">-&gt;</span><span class="normal">idle_id </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span>
 <span class="normal">  </span><span class="function"><a href="http://developer.gnome.org/gdk3/gdk3-Threads.html#GDK-THREADS-LEAVE:CAPS">GDK_THREADS_LEAVE</a></span><span class="normal"> </span><span class="symbol">();</span>
 <span class="normal">   </span>
 <span class="normal">  </span><span class="keyword">return</span><span class="normal"> <a href="glib-The-Main-Event-Loop.html#G-SOURCE-REMOVE:CAPS">G_SOURCE_REMOVE</a></span><span class="symbol">;</span>
 <span class="cbracket">}</span>
 <span class="normal"> </span>
 <span class="keyword">static</span><span class="normal"> </span><span class="type">void</span><span class="normal"> </span>
 <span class="function">some_widget_do_stuff_later</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">SomeWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">self</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  self</span><span class="symbol">-&gt;</span><span class="normal">idle_id </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-idle-add">g_idle_add</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">idle_callback</span><span class="symbol">,</span><span class="normal"> self</span><span class="symbol">);</span>
 <span class="cbracket">}</span>
 <span class="normal"> </span>
 <span class="keyword">static</span><span class="normal"> </span><span class="type">void</span><span class="normal"> </span>
 <span class="function">some_widget_finalize</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">object</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  </span><span class="usertype">SomeWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">self </span><span class="symbol">=</span><span class="normal"> </span><span class="function">SOME_WIDGET</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">object</span><span class="symbol">);</span>
 <span class="normal">   </span>
 <span class="normal">  </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">-&gt;</span><span class="normal">idle_id</span><span class="symbol">)</span>
 <span class="normal">    </span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-source-remove">g_source_remove</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">-&gt;</span><span class="normal">idle_id</span><span class="symbol">);</span>
 <span class="normal">   </span>
 <span class="normal">  </span><span class="function"><a href="https://developer.gnome.org/gobject/unstable/gobject-The-Base-Object-Type.html#G-OBJECT-CLASS:CAPS">G_OBJECT_CLASS</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">parent_class</span><span class="symbol">)-&gt;</span><span class="function">finalize</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">object</span><span class="symbol">);</span>
 <span class="cbracket">}</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <p>This will fail in a multi-threaded application if the
 widget is destroyed before the idle handler fires due
 to the use after free in the callback. A solution, to
 this particular problem, is to check to if the source
 has already been destroy within the callback.</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> <a href="glib-Basic-Types.html#gboolean">gboolean</a> </span>
 <span class="function">idle_callback</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> data</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">  </span><span class="usertype">SomeWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">self </span><span class="symbol">=</span><span class="normal"> data</span><span class="symbol">;</span>
 <span class="normal">  </span>
 <span class="normal">  </span><span class="function"><a href="http://developer.gnome.org/gdk3/gdk3-Threads.html#GDK-THREADS-ENTER:CAPS">GDK_THREADS_ENTER</a></span><span class="normal"> </span><span class="symbol">();</span>
 <span class="normal">  </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(!</span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-source-is-destroyed">g_source_is_destroyed</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-The-Main-Event-Loop.html#g-main-current-source">g_main_current_source</a></span><span class="normal"> </span><span class="symbol">()))</span>
 <span class="normal">    </span><span class="cbracket">{</span>
 <span class="normal">      </span><span class="comment">// do stuff with self</span>
 <span class="normal">    </span><span class="cbracket">}</span>
 <span class="normal">  </span><span class="function"><a href="http://developer.gnome.org/gdk3/gdk3-Threads.html#GDK-THREADS-LEAVE:CAPS">GDK_THREADS_LEAVE</a></span><span class="normal"> </span><span class="symbol">();</span>
 <span class="normal">  </span>
 <span class="normal">  </span><span class="keyword">return</span><span class="normal"> <a href="glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">;</span>
 <span class="cbracket">}</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <div class="refsect3">
 <a name="g-source-is-destroyed.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-is-destroyed.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the source has been destroyed</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-12.html#api-index-2.12">2.12</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-priority"></a><h3>g_source_set_priority ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_priority (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> priority</code></em>);</pre>
 <p>Sets the priority of a source. While the main loop is being run, a
 source will be dispatched if it is ready to be dispatched and no
 sources at a higher (numerically smaller) priority are ready to be
 dispatched.</p>
 <p>A child source always has the same priority as its parent.  It is not
 permitted to change the priority of a source once it has been added
 as a child of another source.</p>
 <div class="refsect3">
 <a name="g-source-set-priority.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>priority</p></td>
 <td class="parameter_description"><p>the new priority.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-priority"></a><h3>g_source_get_priority ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_source_get_priority (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Gets the priority of a source.</p>
 <div class="refsect3">
 <a name="g-source-get-priority.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-priority.returns"></a><h4>Returns</h4>
 <p> the priority of the source</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-can-recurse"></a><h3>g_source_set_can_recurse ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_can_recurse (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                           <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> can_recurse</code></em>);</pre>
 <p>Sets whether a source can be called recursively. If <em class="parameter"><code>can_recurse</code></em>
  is
 <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>, then while the source is being dispatched then this source
 will be processed normally. Otherwise, all processing of this
 source is blocked until the dispatch function returns.</p>
 <div class="refsect3">
 <a name="g-source-set-can-recurse.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>can_recurse</p></td>
 <td class="parameter_description"><p>whether recursion is allowed for this source</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-can-recurse"></a><h3>g_source_get_can_recurse ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_source_get_can_recurse (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Checks whether a source is allowed to be called recursively.
 see <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-can-recurse" title="g_source_set_can_recurse ()"><code class="function">g_source_set_can_recurse()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-get-can-recurse.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-can-recurse.returns"></a><h4>Returns</h4>
 <p> whether recursion is allowed.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-id"></a><h3>g_source_get_id ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_source_get_id (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Returns the numeric ID for a particular source. The ID of a source
 is a positive integer which is unique within a particular main loop
 context. The reverse
 mapping from ID to source is done by <a class="link" href="glib-The-Main-Event-Loop.html#g-main-context-find-source-by-id" title="g_main_context_find_source_by_id ()"><code class="function">g_main_context_find_source_by_id()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-get-id.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-id.returns"></a><h4>Returns</h4>
 <p> the ID (greater than 0) for the source</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-name"></a><h3>g_source_get_name ()</h3>
 <pre class="programlisting">const <span class="returnvalue">char</span> *
 g_source_get_name (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Gets a name for the source, used in debugging and profiling.  The
 name may be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><span class="type">NULL</span></a> if it has never been set with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-name" title="g_source_set_name ()"><code class="function">g_source_set_name()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-get-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-name.returns"></a><h4>Returns</h4>
 <p> the name of the source</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-name"></a><h3>g_source_set_name ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_name (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                    <em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
 <p>Sets a name for the source, used in debugging and profiling.
 The name defaults to <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><span class="type">NULL</span></a>.</p>
 <p>The source name should describe in a human-readable way
 what the source does. For example, "X11 event queue"
 or "GTK+ repaint idle handler" or whatever it is.</p>
 <p>It is permitted to call this function multiple times, but is not
 recommended due to the potential performance impact.  For example,
 one could change the name in the "check" function of a <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a>
 to include details like the event type in the source name.</p>
 <p>Use caution if changing the name while another thread may be
 accessing it with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-name" title="g_source_get_name ()"><code class="function">g_source_get_name()</code></a>; that function does not copy
 the value, and changing the value will free it while the other thread
 may be attempting to use it.</p>
 <div class="refsect3">
 <a name="g-source-set-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>debug name for the source</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-name-by-id"></a><h3>g_source_set_name_by_id ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_name_by_id (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> tag</code></em>,
                          <em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
 <p>Sets the name of a source using its ID.</p>
 <p>This is a convenience utility to set source names from the return
 value of <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>, etc.</p>
 <p>It is a programmer error to attempt to set the name of a non-existent
 source.</p>
 <p>More specifically: source IDs can be reissued after a source has been
 destroyed and therefore it is never valid to use this function with a
 source ID which may have already been removed.  An example is when
 scheduling an idle to run in another thread with <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>: the
 idle may already have run and been removed by the time this function
 is called on its (now invalid) source ID.  This source ID may have
 been reissued, leading to the operation being performed against the
 wrong source.</p>
 <div class="refsect3">
 <a name="g-source-set-name-by-id.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>tag</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> ID</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>debug name for the source</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-context"></a><h3>g_source_get_context ()</h3>
 <pre class="programlisting"><a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="returnvalue">GMainContext</span></a> *
 g_source_get_context (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Gets the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> with which the source is associated.</p>
 <p>You can call this on a source that has been destroyed, provided
 that the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> it was attached to still exists (in which
 case it will return that <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>). In particular, you can
 always call this function on the source returned from
 <a class="link" href="glib-The-Main-Event-Loop.html#g-main-current-source" title="g_main_current_source ()"><code class="function">g_main_current_source()</code></a>. But calling this function on a source
 whose <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> has been destroyed is an error.</p>
 <div class="refsect3">
 <a name="g-source-get-context.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-context.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a> with which the
 source is associated, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> if the context has not
 yet been added to a source. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-callback"></a><h3>g_source_set_callback ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_callback (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> func</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
 <p>Sets the callback function for a source. The callback for a source is
 called from the source's dispatch function.</p>
 <p>The exact type of <em class="parameter"><code>func</code></em>
  depends on the type of source; ie. you
 should not count on <em class="parameter"><code>func</code></em>
  being called with <em class="parameter"><code>data</code></em>
  as its first
 parameter.</p>
 <p>See <a class="link" href="glib-The-Main-Event-Loop.html#mainloop-memory-management" title="Memory management of sources">memory management of sources</a> for details
 on how to handle memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <p>Typically, you won't use this function. Instead use functions specific
 to the type of source you are using.</p>
 <div class="refsect3">
 <a name="g-source-set-callback.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>the source</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>a callback function</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>the data to pass to callback function</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>notify</p></td>
 <td class="parameter_description"><p> a function to call when <em class="parameter"><code>data</code></em>
 is no longer in use, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSourceFunc"></a><h3>GSourceFunc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 <span class="c_punctuation">(</span>*GSourceFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Specifies the type of function passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-full" title="g_timeout_add_full ()"><code class="function">g_timeout_add_full()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>, and <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add-full" title="g_idle_add_full ()"><code class="function">g_idle_add_full()</code></a>.</p>
 <div class="refsect3">
 <a name="GSourceFunc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>data passed to the function, set when the source was
 created with one of the above functions</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="GSourceFunc.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> if the source should be removed. <a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-CONTINUE:CAPS" title="G_SOURCE_CONTINUE"><span class="type">G_SOURCE_CONTINUE</span></a> and
 <a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-REMOVE:CAPS" title="G_SOURCE_REMOVE"><span class="type">G_SOURCE_REMOVE</span></a> are more memorable names for the return value.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-callback-indirect"></a><h3>g_source_set_callback_indirect ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_callback_indirect (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                                 <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> callback_data</code></em>,
                                 <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceCallbackFuncs" title="struct GSourceCallbackFuncs"><span class="type">GSourceCallbackFuncs</span></a> *callback_funcs</code></em>);</pre>
 <p>Sets the callback function storing the data as a refcounted callback
 "object". This is used internally. Note that calling
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-callback-indirect" title="g_source_set_callback_indirect ()"><code class="function">g_source_set_callback_indirect()</code></a> assumes
 an initial reference count on <em class="parameter"><code>callback_data</code></em>
 , and thus
 <em class="parameter"><code>callback_funcs-&gt;unref</code></em>
  will eventually be called once more
 than <em class="parameter"><code>callback_funcs-&gt;ref</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-source-set-callback-indirect.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>the source</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>callback_data</p></td>
 <td class="parameter_description"><p>pointer to callback data "object"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>callback_funcs</p></td>
 <td class="parameter_description"><p>functions for reference counting <em class="parameter"><code>callback_data</code></em>
 and getting the callback and data</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-set-ready-time"></a><h3>g_source_set_ready_time ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_set_ready_time (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> ready_time</code></em>);</pre>
 <p>Sets a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> to be dispatched when the given monotonic time is
 reached (or passed).  If the monotonic time is in the past (as it
 always will be if <em class="parameter"><code>ready_time</code></em>
  is 0) then the source will be
 dispatched immediately.</p>
 <p>If <em class="parameter"><code>ready_time</code></em>
  is -1 then the source is never woken up on the basis
 of the passage of time.</p>
 <p>Dispatching the source does not reset the ready time.  You should do
 so yourself, from the source dispatch function.</p>
 <p>Note that if you have a pair of sources where the ready time of one
 suggests that it will be delivered first but the priority for the
 other suggests that it would be delivered first, and the ready time
 for both sources is reached during the same main context iteration
 then the order of dispatch is undefined.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <div class="refsect3">
 <a name="g-source-set-ready-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>ready_time</p></td>
 <td class="parameter_description"><p>the monotonic time at which the source will be ready,
 0 for "immediately", -1 for "never"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-ready-time"></a><h3>g_source_get_ready_time ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 g_source_get_ready_time (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Gets the "ready time" of <em class="parameter"><code>source</code></em>
 , as set by
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-ready-time" title="g_source_set_ready_time ()"><code class="function">g_source_set_ready_time()</code></a>.</p>
 <p>Any time before the current monotonic time (including 0) is an
 indication that the source will fire immediately.</p>
 <div class="refsect3">
 <a name="g-source-get-ready-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-ready-time.returns"></a><h4>Returns</h4>
 <p> the monotonic ready time, -1 for "never"</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-add-unix-fd"></a><h3>g_source_add_unix_fd ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="returnvalue">gpointer</span></a>
 g_source_add_unix_fd (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> fd</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="type">GIOCondition</span></a> events</code></em>);</pre>
 <p>Monitors <em class="parameter"><code>fd</code></em>
  for the IO events in <em class="parameter"><code>events</code></em>
 .</p>
 <p>The tag returned by this function can be used to remove or modify the
 monitoring of the fd using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-unix-fd" title="g_source_remove_unix_fd ()"><code class="function">g_source_remove_unix_fd()</code></a> or
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-modify-unix-fd" title="g_source_modify_unix_fd ()"><code class="function">g_source_modify_unix_fd()</code></a>.</p>
 <p>It is not necessary to remove the fd before destroying the source; it
 will be cleaned up automatically.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <p>As the name suggests, this function is not available on Windows.</p>
 <div class="refsect3">
 <a name="g-source-add-unix-fd.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fd</p></td>
 <td class="parameter_description"><p>the fd to monitor</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>events</p></td>
 <td class="parameter_description"><p>an event mask</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-add-unix-fd.returns"></a><h4>Returns</h4>
 <p> an opaque tag. </p>
 <p><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove-unix-fd"></a><h3>g_source_remove_unix_fd ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_remove_unix_fd (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> tag</code></em>);</pre>
 <p>Reverses the effect of a previous call to <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a>.</p>
 <p>You only need to call this if you want to remove an fd from being
 watched while keeping the same source around.  In the normal case you
 will just want to destroy the source.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <p>As the name suggests, this function is not available on Windows.</p>
 <div class="refsect3">
 <a name="g-source-remove-unix-fd.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>tag</p></td>
 <td class="parameter_description"><p> the tag from <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-modify-unix-fd"></a><h3>g_source_modify_unix_fd ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_modify_unix_fd (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> tag</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="type">GIOCondition</span></a> new_events</code></em>);</pre>
 <p>Updates the event mask to watch for the fd identified by <em class="parameter"><code>tag</code></em>
 .</p>
 <p><em class="parameter"><code>tag</code></em>
  is the tag returned from <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a>.</p>
 <p>If you want to remove a fd, don't set its event mask to zero.
 Instead, call <a class="link" href="glib-The-Main-Event-Loop.html#g-source-remove-unix-fd" title="g_source_remove_unix_fd ()"><code class="function">g_source_remove_unix_fd()</code></a>.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <p>As the name suggests, this function is not available on Windows.</p>
 <div class="refsect3">
 <a name="g-source-modify-unix-fd.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>tag</p></td>
 <td class="parameter_description"><p> the tag from <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>new_events</p></td>
 <td class="parameter_description"><p>the new event mask to watch</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-query-unix-fd"></a><h3>g_source_query_unix_fd ()</h3>
 <pre class="programlisting"><a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="returnvalue">GIOCondition</span></a>
 g_source_query_unix_fd (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> tag</code></em>);</pre>
 <p>Queries the events reported for the fd corresponding to <em class="parameter"><code>tag</code></em>
  on
 <em class="parameter"><code>source</code></em>
  during the last poll.</p>
 <p>The return value of this function is only defined when the function
 is called from the check or dispatch functions for <em class="parameter"><code>source</code></em>
 .</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <p>As the name suggests, this function is not available on Windows.</p>
 <div class="refsect3">
 <a name="g-source-query-unix-fd.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>tag</p></td>
 <td class="parameter_description"><p> the tag from <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-query-unix-fd.returns"></a><h4>Returns</h4>
 <p> the conditions reported on the fd</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-36.html#api-index-2.36">2.36</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-add-poll"></a><h3>g_source_add_poll ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_add_poll (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                    <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fd</code></em>);</pre>
 <p>Adds a file descriptor to the set of file descriptors polled for
 this source. This is usually combined with <a class="link" href="glib-The-Main-Event-Loop.html#g-source-new" title="g_source_new ()"><code class="function">g_source_new()</code></a> to add an
 event source. The event source's check function will typically test
 the <em class="parameter"><code>revents</code></em>
  field in the <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> struct and return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if events need
 to be processed.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <p>Using this API forces the linear scanning of event sources on each
 main loop iteration.  Newly-written event sources should try to use
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-unix-fd" title="g_source_add_unix_fd ()"><code class="function">g_source_add_unix_fd()</code></a> instead of this API.</p>
 <div class="refsect3">
 <a name="g-source-add-poll.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fd</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> structure holding information about a file
 descriptor to watch.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove-poll"></a><h3>g_source_remove_poll ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_remove_poll (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> *fd</code></em>);</pre>
 <p>Removes a file descriptor from the set of file descriptors polled for
 this source. </p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <div class="refsect3">
 <a name="g-source-remove-poll.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>fd</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a> structure previously passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-poll" title="g_source_add_poll ()"><code class="function">g_source_add_poll()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-add-child-source"></a><h3>g_source_add_child_source ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_add_child_source (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                            <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *child_source</code></em>);</pre>
 <p>Adds <em class="parameter"><code>child_source</code></em>
  to <em class="parameter"><code>source</code></em>
  as a "polled" source; when <em class="parameter"><code>source</code></em>
  is
 added to a <a class="link" href="glib-The-Main-Event-Loop.html#GMainContext" title="GMainContext"><span class="type">GMainContext</span></a>, <em class="parameter"><code>child_source</code></em>
  will be automatically added
 with the same priority, when <em class="parameter"><code>child_source</code></em>
  is triggered, it will
 cause <em class="parameter"><code>source</code></em>
  to dispatch (in addition to calling its own
 callback), and when <em class="parameter"><code>source</code></em>
  is destroyed, it will destroy
 <em class="parameter"><code>child_source</code></em>
  as well. (<em class="parameter"><code>source</code></em>
  will also still be dispatched if
 its own prepare/check functions indicate that it is ready.)</p>
 <p>If you don't need <em class="parameter"><code>child_source</code></em>
  to do anything on its own when it
 triggers, you can call <a href="https://developer.gnome.org/gobject/unstable/gobject-Closures.html#g-source-set-dummy-callback"><code class="function">g_source_set_dummy_callback()</code></a> on it to set a
 callback that does nothing (except return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if appropriate).</p>
 <p><em class="parameter"><code>source</code></em>
  will hold a reference on <em class="parameter"><code>child_source</code></em>
  while <em class="parameter"><code>child_source</code></em>

 is attached to it.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <div class="refsect3">
 <a name="g-source-add-child-source.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>child_source</p></td>
 <td class="parameter_description"><p>a second <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that <em class="parameter"><code>source</code></em>
 should "poll"</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove-child-source"></a><h3>g_source_remove_child_source ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_remove_child_source (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                               <em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *child_source</code></em>);</pre>
 <p>Detaches <em class="parameter"><code>child_source</code></em>
  from <em class="parameter"><code>source</code></em>
  and destroys it.</p>
 <p>This API is only intended to be used by implementations of <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a>.
 Do not call this API on a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> that you did not create.</p>
 <div class="refsect3">
 <a name="g-source-remove-child-source.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>child_source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> previously passed to
 <a class="link" href="glib-The-Main-Event-Loop.html#g-source-add-child-source" title="g_source_add_child_source ()"><code class="function">g_source_add_child_source()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-time"></a><h3>g_source_get_time ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 g_source_get_time (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>);</pre>
 <p>Gets the time to be used when checking this source. The advantage of
 calling this function over calling <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a> directly is
 that when checking multiple sources, GLib can cache a single value
 instead of having to repeatedly get the system monotonic time.</p>
 <p>The time here is the system monotonic time, if available, or some
 other reasonable alternative otherwise.  See <a class="link" href="glib-Date-and-Time-Functions.html#g-get-monotonic-time" title="g_get_monotonic_time ()"><code class="function">g_get_monotonic_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-get-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-get-time.returns"></a><h4>Returns</h4>
 <p> the monotonic time in microseconds</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-get-current-time"></a><h3>g_source_get_current_time ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_source_get_current_time (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> *source</code></em>,
                            <em class="parameter"><code><a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> *timeval</code></em>);</pre>
 <div class="warning">
 <p><code class="literal">g_source_get_current_time</code> has been deprecated since version 2.28 and should not be used in newly-written code.</p>
 <p>use <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-time" title="g_source_get_time ()"><code class="function">g_source_get_time()</code></a> instead</p>
 </div>
 <p>This function ignores <em class="parameter"><code>source</code></em>
  and is otherwise the same as
 <a class="link" href="glib-Date-and-Time-Functions.html#g-get-current-time" title="g_get_current_time ()"><code class="function">g_get_current_time()</code></a>.</p>
 <div class="refsect3">
 <a name="g-source-get-current-time.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>source</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timeval</p></td>
 <td class="parameter_description"><p><a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> structure in which to store current time.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove"></a><h3>g_source_remove ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_source_remove (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> tag</code></em>);</pre>
 <p>Removes the source with the given id from the default main context.</p>
 <p>The id of a <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> is given by <a class="link" href="glib-The-Main-Event-Loop.html#g-source-get-id" title="g_source_get_id ()"><code class="function">g_source_get_id()</code></a>, or will be
 returned by the functions <a class="link" href="glib-The-Main-Event-Loop.html#g-source-attach" title="g_source_attach ()"><code class="function">g_source_attach()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add-full" title="g_idle_add_full ()"><code class="function">g_idle_add_full()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add-full" title="g_timeout_add_full ()"><code class="function">g_timeout_add_full()</code></a>,
 <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-add" title="g_child_watch_add ()"><code class="function">g_child_watch_add()</code></a>, <a class="link" href="glib-The-Main-Event-Loop.html#g-child-watch-add-full" title="g_child_watch_add_full ()"><code class="function">g_child_watch_add_full()</code></a>, <a class="link" href="glib-IO-Channels.html#g-io-add-watch" title="g_io_add_watch ()"><code class="function">g_io_add_watch()</code></a>, and
 <a class="link" href="glib-IO-Channels.html#g-io-add-watch-full" title="g_io_add_watch_full ()"><code class="function">g_io_add_watch_full()</code></a>.</p>
 <p>See also <a class="link" href="glib-The-Main-Event-Loop.html#g-source-destroy" title="g_source_destroy ()"><code class="function">g_source_destroy()</code></a>. You must use <a class="link" href="glib-The-Main-Event-Loop.html#g-source-destroy" title="g_source_destroy ()"><code class="function">g_source_destroy()</code></a> for sources
 added to a non-default main context.</p>
 <p>It is a programmer error to attempt to remove a non-existent source.</p>
 <p>More specifically: source IDs can be reissued after a source has been
 destroyed and therefore it is never valid to use this function with a
 source ID which may have already been removed.  An example is when
 scheduling an idle to run in another thread with <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>: the
 idle may already have run and been removed by the time this function
 is called on its (now invalid) source ID.  This source ID may have
 been reissued, leading to the operation being performed against the
 wrong source.</p>
 <div class="refsect3">
 <a name="g-source-remove.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>tag</p></td>
 <td class="parameter_description"><p>the ID of the source to remove.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-remove.returns"></a><h4>Returns</h4>
 <p> For historical reasons, this function always returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove-by-funcs-user-data"></a><h3>g_source_remove_by_funcs_user_data ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_source_remove_by_funcs_user_data (<em class="parameter"><code><a class="link" href="glib-The-Main-Event-Loop.html#GSourceFuncs" title="struct GSourceFuncs"><span class="type">GSourceFuncs</span></a> *funcs</code></em>,
                                     <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Removes a source from the default main loop context given the
 source functions and user data. If multiple sources exist with the
 same source functions and user data, only one will be destroyed.</p>
 <div class="refsect3">
 <a name="g-source-remove-by-funcs-user-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>funcs</p></td>
 <td class="parameter_description"><p>The <em class="parameter"><code>source_funcs</code></em>
 passed to <a class="link" href="glib-The-Main-Event-Loop.html#g-source-new" title="g_source_new ()"><code class="function">g_source_new()</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>the user data for the callback</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-remove-by-funcs-user-data.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if a source was found and removed. </p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-source-remove-by-user-data"></a><h3>g_source_remove_by_user_data ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_source_remove_by_user_data (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
 <p>Removes a source from the default main loop context given the user
 data for the callback. If multiple sources exist with the same user
 data, only one will be destroyed.</p>
 <div class="refsect3">
 <a name="g-source-remove-by-user-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>user_data</p></td>
 <td class="parameter_description"><p>the user_data for the callback.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-source-remove-by-user-data.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if a source was found and removed. </p>
 </div>
 </div>
 </div>
 <div class="refsect1">
 <a name="glib-The-Main-Event-Loop.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GMainLoop"></a><h3>GMainLoop</h3>
 <pre class="programlisting">typedef struct _GMainLoop GMainLoop;</pre>
 <p>The <code class="literal">GMainLoop</code> struct is an opaque data type
 representing the main event loop of a GLib or GTK+ application.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PRIORITY-HIGH:CAPS"></a><h3>G_PRIORITY_HIGH</h3>
 <pre class="programlisting">#define G_PRIORITY_HIGH            -100
 </pre>
 <p>Use this for high priority event sources.</p>
 <p>It is not used within GLib or GTK+.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PRIORITY-DEFAULT:CAPS"></a><h3>G_PRIORITY_DEFAULT</h3>
 <pre class="programlisting">#define G_PRIORITY_DEFAULT          0
 </pre>
 <p>Use this for default priority event sources.</p>
 <p>In GLib this priority is used when adding timeout functions
 with <a class="link" href="glib-The-Main-Event-Loop.html#g-timeout-add" title="g_timeout_add ()"><code class="function">g_timeout_add()</code></a>. In GDK this priority is used for events
 from the X server.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PRIORITY-HIGH-IDLE:CAPS"></a><h3>G_PRIORITY_HIGH_IDLE</h3>
 <pre class="programlisting">#define G_PRIORITY_HIGH_IDLE        100
 </pre>
 <p>Use this for high priority idle functions.</p>
 <p>GTK+ uses <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH-IDLE:CAPS" title="G_PRIORITY_HIGH_IDLE"><span class="type">G_PRIORITY_HIGH_IDLE</span></a> + 10 for resizing operations,
 and <a class="link" href="glib-The-Main-Event-Loop.html#G-PRIORITY-HIGH-IDLE:CAPS" title="G_PRIORITY_HIGH_IDLE"><span class="type">G_PRIORITY_HIGH_IDLE</span></a> + 20 for redrawing operations. (This is
 done to ensure that any pending resizes are processed before any
 pending redraws, so that widgets are not redrawn twice unnecessarily.)</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PRIORITY-DEFAULT-IDLE:CAPS"></a><h3>G_PRIORITY_DEFAULT_IDLE</h3>
 <pre class="programlisting">#define G_PRIORITY_DEFAULT_IDLE     200
 </pre>
 <p>Use this for default priority idle functions.</p>
 <p>In GLib this priority is used when adding idle functions with
 <a class="link" href="glib-The-Main-Event-Loop.html#g-idle-add" title="g_idle_add ()"><code class="function">g_idle_add()</code></a>.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PRIORITY-LOW:CAPS"></a><h3>G_PRIORITY_LOW</h3>
 <pre class="programlisting">#define G_PRIORITY_LOW              300
 </pre>
 <p>Use this for very low priority background tasks.</p>
 <p>It is not used within GLib or GTK+.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-SOURCE-CONTINUE:CAPS"></a><h3>G_SOURCE_CONTINUE</h3>
 <pre class="programlisting">#define G_SOURCE_CONTINUE       TRUE
 </pre>
 <p>Use this macro as the return value of a <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> to leave
 the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> in the main loop.</p>
 <p class="since">Since: <a class="link" href="api-index-2-32.html#api-index-2.32">2.32</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-SOURCE-REMOVE:CAPS"></a><h3>G_SOURCE_REMOVE</h3>
 <pre class="programlisting">#define G_SOURCE_REMOVE         FALSE
 </pre>
 <p>Use this macro as the return value of a <a class="link" href="glib-The-Main-Event-Loop.html#GSourceFunc" title="GSourceFunc ()"><span class="type">GSourceFunc</span></a> to remove
 the <a class="link" href="glib-The-Main-Event-Loop.html#GSource" title="struct GSource"><span class="type">GSource</span></a> from the main loop.</p>
 <p class="since">Since: <a class="link" href="api-index-2-32.html#api-index-2.32">2.32</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GMainContext"></a><h3>GMainContext</h3>
 <pre class="programlisting">typedef struct _GMainContext GMainContext;</pre>
 <p>The <code class="literal">GMainContext</code> struct is an opaque data
 type representing a set of sources to be handled in a main loop.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GPid"></a><h3>GPid</h3>
 <pre class="programlisting">typedef int GPid;
 </pre>
 <p>A type which is used to hold a process identification.</p>
 <p>On UNIX, processes are identified by a process id (an integer),
 while Windows uses process handles (which are pointers).</p>
 <p>GPid is used in GLib only for descendant processes spawned with
 the g_spawn functions.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-PID-FORMAT:CAPS"></a><h3>G_PID_FORMAT</h3>
 <pre class="programlisting">#define G_PID_FORMAT "i"
 </pre>
 <p>A format specifier that can be used in <code class="function">printf()</code>-style format strings
 when printing a <a class="link" href="glib-The-Main-Event-Loop.html#GPid" title="GPid"><span class="type">GPid</span></a>.</p>
 <p class="since">Since: <a class="link" href="api-index-2-50.html#api-index-2.50">2.50</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GPollFD"></a><h3>struct GPollFD</h3>
 <pre class="programlisting">struct GPollFD {
 #if defined (G_OS_WIN32) &amp;&amp; GLIB_SIZEOF_VOID_P == 8
 #endif
 #else
   gint		fd;
 #endif
   gushort 	events;
   gushort 	revents;
 };
 </pre>
 <p>Represents a file descriptor, which events to poll for, and which events
 occurred.</p>
 <div class="refsect3">
 <a name="GPollFD.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> <em class="structfield"><code><a name="GPollFD.fd"></a>fd</code></em>;</p></td>
 <td class="struct_member_description"><p>the file descriptor to poll (or a HANDLE on Win32)</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="glib-Basic-Types.html#gushort" title="gushort"><span class="type">gushort</span></a> <em class="structfield"><code><a name="GPollFD.events"></a>events</code></em>;</p></td>
 <td class="struct_member_description"><p>a bitwise combination from <a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="type">GIOCondition</span></a>, specifying which
 events should be polled for. Typically for reading from a file
 descriptor you would use <a class="link" href="glib-IO-Channels.html#G-IO-IN:CAPS"><code class="literal">G_IO_IN</code></a> | <a class="link" href="glib-IO-Channels.html#G-IO-HUP:CAPS"><code class="literal">G_IO_HUP</code></a> | <a class="link" href="glib-IO-Channels.html#G-IO-ERR:CAPS"><code class="literal">G_IO_ERR</code></a>, and
 for writing you would use <a class="link" href="glib-IO-Channels.html#G-IO-OUT:CAPS"><code class="literal">G_IO_OUT</code></a> | <a class="link" href="glib-IO-Channels.html#G-IO-ERR:CAPS"><code class="literal">G_IO_ERR</code></a>.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="glib-Basic-Types.html#gushort" title="gushort"><span class="type">gushort</span></a> <em class="structfield"><code><a name="GPollFD.revents"></a>revents</code></em>;</p></td>
 <td class="struct_member_description"><p>a bitwise combination of flags from <a class="link" href="glib-IO-Channels.html#GIOCondition" title="enum GIOCondition"><span class="type">GIOCondition</span></a>, returned
 from the <code class="function">poll()</code> function to indicate which events occurred.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-POLLFD-FORMAT:CAPS"></a><h3>G_POLLFD_FORMAT</h3>
 <pre class="programlisting">#define G_POLLFD_FORMAT "%d"
 </pre>
 <p>A format specifier that can be used in <code class="function">printf()</code>-style format strings
 when printing the <em class="parameter"><code>fd</code></em>
  member of a <a class="link" href="glib-The-Main-Event-Loop.html#GPollFD" title="struct GPollFD"><span class="type">GPollFD</span></a>.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSource"></a><h3>struct GSource</h3>
 <pre class="programlisting">struct GSource {
 };
 </pre>
 <p>The <code class="literal">GSource</code> struct is an opaque data type
 representing an event source.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSourceFuncs"></a><h3>struct GSourceFuncs</h3>
 <pre class="programlisting">struct GSourceFuncs {
   gboolean (*prepare)  (GSource    *source,
                         gint       *timeout_);
   gboolean (*check)    (GSource    *source);
   gboolean (*dispatch) (GSource    *source,
                         GSourceFunc callback,
                         gpointer    user_data);
   void     (*finalize) (GSource    *source); /* Can be NULL */
 };
 </pre>
 <p>The <code class="literal">GSourceFuncs</code> struct contains a table of
 functions used to handle event sources in a generic manner.</p>
 <p>For idle sources, the prepare and check functions always return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>
 to indicate that the source is always ready to be processed. The prepare
 function also returns a timeout value of 0 to ensure that the <code class="function">poll()</code> call
 doesn't block (since that would be time wasted which could have been spent
 running the idle function).</p>
 <p>For timeout sources, the prepare and check functions both return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>
 if the timeout interval has expired. The prepare function also returns
 a timeout value to ensure that the <code class="function">poll()</code> call doesn't block too long
 and miss the next timeout.</p>
 <p>For file descriptor sources, the prepare function typically returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>,
 since it must wait until <code class="function">poll()</code> has been called before it knows whether
 any events need to be processed. It sets the returned timeout to -1 to
 indicate that it doesn't mind how long the <code class="function">poll()</code> call blocks. In the
 check function, it tests the results of the <code class="function">poll()</code> call to see if the
 required condition has been met, and returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if so.</p>
 <div class="refsect3">
 <a name="GSourceFuncs.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceFuncs.prepare"></a>prepare</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called before all the file descriptors are polled. If the
 source can determine that it is ready here (without waiting for the
 results of the <code class="function">poll()</code> call) it should return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>. It can also return
 a <em class="parameter"><code>timeout_</code></em>
 value which should be the maximum timeout (in milliseconds)
 which should be passed to the <code class="function">poll()</code> call. The actual timeout used will
 be -1 if all sources returned -1, or it will be the minimum of all
 the <em class="parameter"><code>timeout_</code></em>
 values returned which were &gt;= 0.  Since 2.36 this may
 be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, in which case the effect is as if the function always returns
 <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> with a timeout of -1.  If <em class="parameter"><code>prepare</code></em>
 returns a
 timeout and the source also has a 'ready time' set then the
 nearer of the two will be used.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceFuncs.check"></a>check</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called after all the file descriptors are polled. The source
 should return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if it is ready to be dispatched. Note that some
 time may have passed since the previous prepare function was called,
 so the source should be checked again here.  Since 2.36 this may
 be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, in which case the effect is as if the function always returns
 <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceFuncs.dispatch"></a>dispatch</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called to dispatch the event source, after it has returned
 <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> in either its <em class="parameter"><code>prepare</code></em>
 or its <em class="parameter"><code>check</code></em>
 function. The <em class="parameter"><code>dispatch</code></em>
 function is passed in a callback function and data. The callback
 function may be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> if the source was never connected to a callback
 using <a class="link" href="glib-The-Main-Event-Loop.html#g-source-set-callback" title="g_source_set_callback ()"><code class="function">g_source_set_callback()</code></a>. The <em class="parameter"><code>dispatch</code></em>
 function should call the
 callback function with <em class="parameter"><code>user_data</code></em>
 and whatever additional parameters
 are needed for this type of event source. The return value of the
 <em class="parameter"><code>dispatch</code></em>
 function should be <a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-REMOVE:CAPS" title="G_SOURCE_REMOVE"><span class="type">G_SOURCE_REMOVE</span></a> if the source should be
 removed or <a class="link" href="glib-The-Main-Event-Loop.html#G-SOURCE-CONTINUE:CAPS" title="G_SOURCE_CONTINUE"><span class="type">G_SOURCE_CONTINUE</span></a> to keep it.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceFuncs.finalize"></a>finalize</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called when the source is finalized.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSourceCallbackFuncs"></a><h3>struct GSourceCallbackFuncs</h3>
 <pre class="programlisting">struct GSourceCallbackFuncs {
   void (*ref)   (gpointer     cb_data);
   void (*unref) (gpointer     cb_data);
   void (*get)   (gpointer     cb_data,
                  GSource     *source,
                  GSourceFunc *func,
                  gpointer    *data);
 };
 </pre>
 <p>The <code class="literal">GSourceCallbackFuncs</code> struct contains
 functions for managing callback objects.</p>
 <div class="refsect3">
 <a name="GSourceCallbackFuncs.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceCallbackFuncs.ref"></a>ref</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called when a reference is added to the callback object</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceCallbackFuncs.unref"></a>unref</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called when a reference to the callback object is dropped</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><em class="structfield"><code><a name="GSourceCallbackFuncs.get"></a>get</code></em> ()</p></td>
 <td class="struct_member_description"><p>Called to extract the callback function and data from the
 callback object.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 </div>
 </div>
 <div class="footer">
 <hr>Generated by GTK-Doc V1.25.1</div>
 </body>
 </html>