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<a name="GAsyncInitable"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GAsyncInitable.top_of_page"></a>GAsyncInitable</span></h2>
<p>GAsyncInitable — Asynchronously failable object initialization interface</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="GAsyncInitable.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">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GAsyncInitable.html#g-async-initable-init-async" title="g_async_initable_init_async ()">g_async_initable_init_async</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GAsyncInitable.html#g-async-initable-init-finish" title="g_async_initable_init_finish ()">g_async_initable_init_finish</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="GAsyncInitable.html#g-async-initable-new-async" title="g_async_initable_new_async ()">g_async_initable_new_async</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../gobject-The-Base-Object-Type.html#GObject-struct"><span class="returnvalue">GObject</span></a> *
</td>
<td class="function_name">
<a class="link" href="GAsyncInitable.html#g-async-initable-new-finish" title="g_async_initable_new_finish ()">g_async_initable_new_finish</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="GAsyncInitable.html#g-async-initable-new-valist-async" title="g_async_initable_new_valist_async ()">g_async_initable_new_valist_async</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="GAsyncInitable.html#g-async-initable-newv-async" title="g_async_initable_newv_async ()">g_async_initable_newv_async</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GAsyncInitable.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="GAsyncInitable.html#GAsyncInitable-struct" title="GAsyncInitable">GAsyncInitable</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GAsyncInitable.html#GAsyncInitableIface" title="struct GAsyncInitableIface">GAsyncInitableIface</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GAsyncInitable.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/GTypeModule.html">GInterface</a>
<span class="lineart">╰──</span> GAsyncInitable
</pre>
</div>
<div class="refsect1">
<a name="GAsyncInitable.prerequisites"></a><h2>Prerequisites</h2>
<p>
GAsyncInitable requires
<a href="../gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>.</p>
</div>
<div class="refsect1">
<a name="GAsyncInitable.implementations"></a><h2>Known Implementations</h2>
<p>
GAsyncInitable is implemented by
<a class="link" href="GDBusConnection.html" title="GDBusConnection">GDBusConnection</a>, <a class="link" href="GDBusObjectManagerClient.html" title="GDBusObjectManagerClient">GDBusObjectManagerClient</a> and <a class="link" href="GDBusProxy.html" title="GDBusProxy">GDBusProxy</a>.</p>
</div>
<div class="refsect1">
<a name="GAsyncInitable.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gio/gio.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GAsyncInitable.description"></a><h2>Description</h2>
<p>This is the asynchronous version of <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a>; it behaves the same
in all ways except that initialization is asynchronous. For more details
see the descriptions on <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a>.</p>
<p>A class may implement both the <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a> and <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> interfaces.</p>
<p>Users of objects implementing this are not intended to use the interface
method directly; instead it will be used automatically in various ways.
For C applications you generally just call <a class="link" href="GAsyncInitable.html#g-async-initable-new-async" title="g_async_initable_new_async ()"><code class="function">g_async_initable_new_async()</code></a>
directly, or indirectly via a <code class="function">foo_thing_new_async()</code> wrapper. This will call
<a class="link" href="GAsyncInitable.html#g-async-initable-init-async" title="g_async_initable_init_async ()"><code class="function">g_async_initable_init_async()</code></a> under the cover, calling back with <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> and
a set <a href="../glib-Error-Reporting.html#GError"><code class="literal">GError</code></a> on failure.</p>
<p>A typical implementation might look something like this:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
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<td class="listing_code"><pre class="programlisting"><span class="keyword">enum</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> NOT_INITIALIZED</span><span class="symbol">,</span>
<span class="normal"> INITIALIZING</span><span class="symbol">,</span>
<span class="normal"> INITIALIZED</span>
<span class="cbracket">}</span><span class="symbol">;</span>
<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">_foo_ready_cb</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">Foo</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"> </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"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">state </span><span class="symbol">=</span><span class="normal"> INITIALIZED</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"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results</span><span class="symbol">;</span><span class="normal"> l </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"> 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="cbracket">{</span>
<span class="normal"> </span><span class="usertype">GTask</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">task </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">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">success</span><span class="symbol">)</span>
<span class="normal"> </span><span class="function"><a href="GTask.html#g-task-return-boolean">g_task_return_boolean</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</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="keyword">else</span>
<span class="normal"> </span><span class="function"><a href="GTask.html#g-task-return-new-error">g_task_return_new_error</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">...);</span>
<span class="normal"> </span><span class="function"><a href="../gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</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">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results</span><span class="symbol">);</span>
<span class="normal"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results </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="cbracket">}</span>
<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">foo_init_async</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GAsyncInitable</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">initable</span><span class="symbol">,</span>
<span class="normal"> </span><span class="type">int</span><span class="normal"> io_priority</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GCancellable</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">cancellable</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GAsyncReadyCallback</span><span class="normal"> callback</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> user_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">Foo</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">FOO</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">initable</span><span class="symbol">);</span>
<span class="normal"> </span><span class="usertype">GTask</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">task</span><span class="symbol">;</span>
<span class="normal"> task </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GTask.html#g-task-new">g_task_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">initable</span><span class="symbol">,</span><span class="normal"> cancellable</span><span class="symbol">,</span><span class="normal"> callback</span><span class="symbol">,</span><span class="normal"> user_data</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">switch</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">state</span><span class="symbol">)</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="keyword">case</span><span class="normal"> NOT_INITIALIZED</span><span class="symbol">:</span>
<span class="normal"> </span><span class="function">_foo_get_ready</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">);</span>
<span class="normal"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="../glib-Doubly-Linked-Lists.html#g-list-append">g_list_append</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results</span><span class="symbol">,</span>
<span class="normal"> task</span><span class="symbol">);</span>
<span class="normal"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">state </span><span class="symbol">=</span><span class="normal"> INITIALIZING</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">break</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">case</span><span class="normal"> INITIALIZING</span><span class="symbol">:</span>
<span class="normal"> self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="../glib-Doubly-Linked-Lists.html#g-list-append">g_list_append</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">init_results</span><span class="symbol">,</span>
<span class="normal"> task</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">break</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">case</span><span class="normal"> INITIALIZED</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">self</span><span class="symbol">-&gt;</span><span class="normal">priv</span><span class="symbol">-&gt;</span><span class="normal">success</span><span class="symbol">)</span>
<span class="normal"> </span><span class="function"><a href="GTask.html#g-task-return-new-error">g_task_return_new_error</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">...);</span>
<span class="normal"> </span><span class="keyword">else</span>
<span class="normal"> </span><span class="function"><a href="GTask.html#g-task-return-boolean">g_task_return_boolean</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</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"><a href="../gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">task</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">break</span><span class="symbol">;</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span>
<span class="keyword">static</span><span class="normal"> <a href="../glib-Basic-Types.html#gboolean">gboolean</a></span>
<span class="function">foo_init_finish</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GAsyncInitable</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">initable</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GAsyncResult</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">result</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GError</span><span class="normal"> </span><span class="symbol">**</span><span class="normal">error</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="../glib-Warnings-and-Assertions.html#g-return-val-if-fail">g_return_val_if_fail</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="GTask.html#g-task-is-valid">g_task_is_valid</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">result</span><span class="symbol">,</span><span class="normal"> initable</span><span class="symbol">),</span><span class="normal"> <a href="../glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> </span><span class="function"><a href="GTask.html#g-task-propagate-boolean">g_task_propagate_boolean</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function">G_TASK</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">result</span><span class="symbol">),</span><span class="normal"> error</span><span class="symbol">);</span>
<span class="cbracket">}</span>
<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">foo_async_initable_iface_init</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> g_iface</span><span class="symbol">,</span>
<span class="normal"> </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">GAsyncInitableIface</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">iface </span><span class="symbol">=</span><span class="normal"> g_iface</span><span class="symbol">;</span>
<span class="normal"> iface</span><span class="symbol">-&gt;</span><span class="normal">init_async </span><span class="symbol">=</span><span class="normal"> foo_init_async</span><span class="symbol">;</span>
<span class="normal"> iface</span><span class="symbol">-&gt;</span><span class="normal">init_finish </span><span class="symbol">=</span><span class="normal"> foo_init_finish</span><span class="symbol">;</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p></p>
</div>
<div class="refsect1">
<a name="GAsyncInitable.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="g-async-initable-init-async"></a><h3>g_async_initable_init_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g_async_initable_init_async (<em class="parameter"><code><a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> *initable</code></em>,
<em class="parameter"><code><span class="type">int</span> io_priority</code></em>,
<em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Starts asynchronous initialization of the object implementing the
interface. This must be done before any real use of the object after
initial construction. If the object also implements <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a> you can
optionally call <a class="link" href="GInitable.html#g-initable-init" title="g_initable_init ()"><code class="function">g_initable_init()</code></a> instead.</p>
<p>When the initialization is finished, <em class="parameter"><code>callback</code></em>
will be called. You can
then call <a class="link" href="GAsyncInitable.html#g-async-initable-init-finish" title="g_async_initable_init_finish ()"><code class="function">g_async_initable_init_finish()</code></a> to get the result of the
initialization.</p>
<p>Implementations may also support cancellation. If <em class="parameter"><code>cancellable</code></em>
is not
<a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, then initialization can be cancelled by triggering the cancellable
object from another thread. If the operation was cancelled, the error
<a class="link" href="gio-GIOError.html#G-IO-ERROR-CANCELLED:CAPS"><code class="literal">G_IO_ERROR_CANCELLED</code></a> will be returned. If <em class="parameter"><code>cancellable</code></em>
is not <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, and
the object doesn't support cancellable initialization, the error
<a class="link" href="gio-GIOError.html#G-IO-ERROR-NOT-SUPPORTED:CAPS"><code class="literal">G_IO_ERROR_NOT_SUPPORTED</code></a> will be returned.</p>
<p>As with <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a>, if the object is not initialized, or initialization
returns with an error, then all operations on the object except
<a href="../gobject-The-Base-Object-Type.html#g-object-ref"><code class="function">g_object_ref()</code></a> and <a href="../gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a> are considered to be invalid, and
have undefined behaviour. They will often fail with <a href="../glib-Message-Logging.html#g-critical"><code class="function">g_critical()</code></a> or
<a href="../glib-Message-Logging.html#g-warning"><code class="function">g_warning()</code></a>, but this must not be relied on.</p>
<p>Implementations of this method must be idempotent: i.e. multiple calls
to this function with the same argument should return the same results.
Only the first call initializes the object; further calls return the result
of the first call. This is so that it's safe to implement the singleton
pattern in the GObject constructor function.</p>
<p>For classes that also support the <a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a> interface, the default
implementation of this method will run the <a class="link" href="GInitable.html#g-initable-init" title="g_initable_init ()"><code class="function">g_initable_init()</code></a> function
in a thread, so if you want to support asynchronous initialization via
threads, just implement the <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> interface without overriding
any interface methods.</p>
<div class="refsect3">
<a name="g-async-initable-init-async.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>initable</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>io_priority</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncResult.html#io-priority" title="I/O Priority">I/O priority</a> of the operation</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> to call when the request is satisfied</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the data to pass to callback function</p></td>
<td class="parameter_annotations"> </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-async-initable-init-finish"></a><h3>g_async_initable_init_finish ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
g_async_initable_init_finish (<em class="parameter"><code><a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> *initable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a> *res</code></em>,
<em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Finishes asynchronous initialization and returns the result.
See <a class="link" href="GAsyncInitable.html#g-async-initable-init-async" title="g_async_initable_init_async ()"><code class="function">g_async_initable_init_async()</code></a>.</p>
<div class="refsect3">
<a name="g-async-initable-init-finish.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>initable</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>res</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a <a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> location to store the error occurring, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to
ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-async-initable-init-finish.returns"></a><h4>Returns</h4>
<p> <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if successful. If an error has occurred, this function
will return <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> and set <em class="parameter"><code>error</code></em>
appropriately if present.</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-async-initable-new-async"></a><h3>g_async_initable_new_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g_async_initable_new_async (<em class="parameter"><code><a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> object_type</code></em>,
<em class="parameter"><code><span class="type">int</span> io_priority</code></em>,
<em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *first_property_name</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Helper function for constructing <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> object. This is
similar to <a href="../gobject-The-Base-Object-Type.html#g-object-new"><code class="function">g_object_new()</code></a> but also initializes the object asynchronously.</p>
<p>When the initialization is finished, <em class="parameter"><code>callback</code></em>
will be called. You can
then call <a class="link" href="GAsyncInitable.html#g-async-initable-new-finish" title="g_async_initable_new_finish ()"><code class="function">g_async_initable_new_finish()</code></a> to get the new object and check
for any errors.</p>
<div class="refsect3">
<a name="g-async-initable-new-async.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>object_type</p></td>
<td class="parameter_description"><p>a <a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> supporting <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>io_priority</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncResult.html#io-priority" title="I/O Priority">I/O priority</a> of the operation</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> to call when the initialization is
finished</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_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>first_property_name</p></td>
<td class="parameter_description"><p> the name of the first property, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if no
properties. </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>...</p></td>
<td class="parameter_description"><p>the value of the first property, followed by other property
value pairs, and ended by <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-async-initable-new-finish"></a><h3>g_async_initable_new_finish ()</h3>
<pre class="programlisting"><a href="../gobject-The-Base-Object-Type.html#GObject-struct"><span class="returnvalue">GObject</span></a> *
g_async_initable_new_finish (<em class="parameter"><code><a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> *initable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a> *res</code></em>,
<em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Finishes the async construction for the various g_async_initable_new
calls, returning the created object or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error.</p>
<div class="refsect3">
<a name="g-async-initable-new-finish.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>initable</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> from the callback</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>res</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncResult.html" title="GAsyncResult"><span class="type">GAsyncResult</span></a> from the callback</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>return location for errors, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-async-initable-new-finish.returns"></a><h4>Returns</h4>
<p> a newly created <a href="../gobject-The-Base-Object-Type.html#GObject-struct"><span class="type">GObject</span></a>,
or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error. Free with <a href="../gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a>. </p>
<p><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object][<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-2-22.html#api-index-2.22">2.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-async-initable-new-valist-async"></a><h3>g_async_initable_new_valist_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g_async_initable_new_valist_async (<em class="parameter"><code><a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> object_type</code></em>,
<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *first_property_name</code></em>,
<em class="parameter"><code><span class="type">va_list</span> var_args</code></em>,
<em class="parameter"><code><span class="type">int</span> io_priority</code></em>,
<em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Helper function for constructing <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> object. This is
similar to <a href="../gobject-The-Base-Object-Type.html#g-object-new-valist"><code class="function">g_object_new_valist()</code></a> but also initializes the object
asynchronously.</p>
<p>When the initialization is finished, <em class="parameter"><code>callback</code></em>
will be called. You can
then call <a class="link" href="GAsyncInitable.html#g-async-initable-new-finish" title="g_async_initable_new_finish ()"><code class="function">g_async_initable_new_finish()</code></a> to get the new object and check
for any errors.</p>
<div class="refsect3">
<a name="g-async-initable-new-valist-async.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>object_type</p></td>
<td class="parameter_description"><p>a <a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> supporting <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>first_property_name</p></td>
<td class="parameter_description"><p>the name of the first property, followed by
the value, and other property value pairs, and ended by <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>var_args</p></td>
<td class="parameter_description"><p>The var args list generated from <em class="parameter"><code>first_property_name</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>io_priority</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncResult.html#io-priority" title="I/O Priority">I/O priority</a> of the operation</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> to call when the initialization is
finished</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the data to pass to callback function</p></td>
<td class="parameter_annotations"> </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-async-initable-newv-async"></a><h3>g_async_initable_newv_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g_async_initable_newv_async (<em class="parameter"><code><a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> object_type</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_parameters</code></em>,
<em class="parameter"><code><a href="../gobject-The-Base-Object-Type.html#GParameter"><span class="type">GParameter</span></a> *parameters</code></em>,
<em class="parameter"><code><span class="type">int</span> io_priority</code></em>,
<em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
<em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Helper function for constructing <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a> object. This is
similar to <a href="../gobject-The-Base-Object-Type.html#g-object-newv"><code class="function">g_object_newv()</code></a> but also initializes the object asynchronously.</p>
<p>When the initialization is finished, <em class="parameter"><code>callback</code></em>
will be called. You can
then call <a class="link" href="GAsyncInitable.html#g-async-initable-new-finish" title="g_async_initable_new_finish ()"><code class="function">g_async_initable_new_finish()</code></a> to get the new object and check
for any errors.</p>
<div class="refsect3">
<a name="g-async-initable-newv-async.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>object_type</p></td>
<td class="parameter_description"><p>a <a href="../gobject-Type-Information.html#GType"><span class="type">GType</span></a> supporting <a class="link" href="GAsyncInitable.html" title="GAsyncInitable"><span class="type">GAsyncInitable</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_parameters</p></td>
<td class="parameter_description"><p>the number of parameters in <em class="parameter"><code>parameters</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parameters</p></td>
<td class="parameter_description"><p>the parameters to use to construct the object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>io_priority</p></td>
<td class="parameter_description"><p>the <a class="link" href="GAsyncResult.html#io-priority" title="I/O Priority">I/O priority</a> of the operation</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>optional <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> object, <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>a <a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> to call when the initialization is
finished</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the data to pass to callback function</p></td>
<td class="parameter_annotations"> </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>
</div>
<div class="refsect1">
<a name="GAsyncInitable.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GAsyncInitable-struct"></a><h3>GAsyncInitable</h3>
<pre class="programlisting">typedef struct _GAsyncInitable GAsyncInitable;</pre>
<p>Interface for asynchronously initializable objects.</p>
<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="GAsyncInitableIface"></a><h3>struct GAsyncInitableIface</h3>
<pre class="programlisting">struct GAsyncInitableIface {
GTypeInterface g_iface;
/* Virtual Table */
void (* init_async) (GAsyncInitable *initable,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean (* init_finish) (GAsyncInitable *initable,
GAsyncResult *res,
GError **error);
};
</pre>
<p>Provides an interface for asynchronous initializing object such that
initialization may fail.</p>
<div class="refsect3">
<a name="GAsyncInitableIface.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="GAsyncInitableIface.init-async"></a>init_async</code></em> ()</p></td>
<td class="struct_member_description"><p>Starts initialization of the object.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GAsyncInitableIface.init-finish"></a>init_finish</code></em> ()</p></td>
<td class="struct_member_description"><p>Finishes initialization of the object.</p></td>
<td class="struct_member_annotations"> </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>
</div>
<div class="refsect1">
<a name="GAsyncInitable.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GInitable.html" title="GInitable"><span class="type">GInitable</span></a></p>
</div>
</div>
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