| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Object HANDLEs</title> |
| <link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> |
| <link rel="home" href="../../../boost_asio.html" title="Boost.Asio"> |
| <link rel="up" href="../windows.html" title="Windows-Specific Functionality"> |
| <link rel="prev" href="random_access_handle.html" title="Random-Access HANDLEs"> |
| <link rel="next" href="../ssl.html" title="SSL"> |
| </head> |
| <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> |
| <table cellpadding="2" width="100%"><tr> |
| <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> |
| <td align="center"><a href="../../../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="random_access_handle.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../boost_asio.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../ssl.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.overview.windows.object_handle"></a><a class="link" href="object_handle.html" title="Object HANDLEs">Object HANDLEs</a> |
| </h4></div></div></div> |
| <p> |
| Boost.Asio provides Windows-specific classes that permit asynchronous wait |
| operations to be performed on HANDLEs to kernel objects of the following |
| types: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| Change notification |
| </li> |
| <li class="listitem"> |
| Console input |
| </li> |
| <li class="listitem"> |
| Event |
| </li> |
| <li class="listitem"> |
| Memory resource notification |
| </li> |
| <li class="listitem"> |
| Process |
| </li> |
| <li class="listitem"> |
| Semaphore |
| </li> |
| <li class="listitem"> |
| Thread |
| </li> |
| <li class="listitem"> |
| Waitable timer |
| </li> |
| </ul></div> |
| <p> |
| For example, to perform asynchronous operations on an event, the following |
| object may be created: |
| </p> |
| <pre class="programlisting"><span class="identifier">HANDLE</span> <span class="identifier">handle</span> <span class="special">=</span> <span class="special">::</span><span class="identifier">CreateEvent</span><span class="special">(...);</span> |
| <span class="identifier">windows</span><span class="special">::</span><span class="identifier">object_handle</span> <span class="identifier">file</span><span class="special">(</span><span class="identifier">my_io_service</span><span class="special">,</span> <span class="identifier">handle</span><span class="special">);</span> |
| </pre> |
| <p> |
| The <code class="computeroutput"><span class="identifier">wait</span><span class="special">()</span></code> |
| and <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code> |
| member functions may then be used to wait until the kernel object is signalled. |
| </p> |
| <h6> |
| <a name="boost_asio.overview.windows.object_handle.h0"></a> |
| <span class="phrase"><a name="boost_asio.overview.windows.object_handle.see_also"></a></span><a class="link" href="object_handle.html#boost_asio.overview.windows.object_handle.see_also">See Also</a> |
| </h6> |
| <p> |
| <a class="link" href="../../reference/windows__object_handle.html" title="windows::object_handle">windows::object_handle</a>, |
| <a class="link" href="../../reference/windows__basic_object_handle.html" title="windows::basic_object_handle">windows::basic_object_handle</a>, |
| <a class="link" href="../../reference/windows__object_handle_service.html" title="windows::object_handle_service">windows::object_handle_service</a>. |
| </p> |
| <h6> |
| <a name="boost_asio.overview.windows.object_handle.h1"></a> |
| <span class="phrase"><a name="boost_asio.overview.windows.object_handle.notes"></a></span><a class="link" href="object_handle.html#boost_asio.overview.windows.object_handle.notes">Notes</a> |
| </h6> |
| <p> |
| Windows object <code class="computeroutput"><span class="identifier">HANDLE</span></code>s |
| are only available at compile time when targeting Windows. Programs may |
| test for the macro <code class="computeroutput"><span class="identifier">BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE</span></code> |
| to determine whether they are supported. |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2003-2015 Christopher M. |
| Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
| </p> |
| </div></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="random_access_handle.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../boost_asio.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../ssl.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
