95 lines
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95 lines
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Object HANDLEs</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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<a accesskey="p" href="random_access_handle.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../ssl.html"><img src="../../../next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.overview.windows.object_handle"></a><a class="link" href="object_handle.html" title="Object HANDLEs">Object HANDLEs</a>
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</h4></div></div></div>
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<p>
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Asio provides Windows-specific classes that permit asynchronous wait operations
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to be performed on HANDLEs to kernel objects of the following types:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Change notification
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</li>
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<li class="listitem">
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Console input
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</li>
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<li class="listitem">
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Event
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</li>
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<li class="listitem">
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Memory resource notification
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</li>
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<li class="listitem">
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Process
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</li>
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<li class="listitem">
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Semaphore
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</li>
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<li class="listitem">
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Thread
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</li>
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<li class="listitem">
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Waitable timer
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</li>
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</ul></div>
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<p>
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For example, to perform asynchronous operations on an event, the following
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object may be created:
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</p>
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<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>
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<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_context</span><span class="special">,</span> <span class="identifier">handle</span><span class="special">);</span>
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</pre>
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<p>
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The <code class="computeroutput"><span class="identifier">wait</span><span class="special">()</span></code>
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and <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code>
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member functions may then be used to wait until the kernel object is signalled.
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</p>
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<h6>
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<a name="asio.overview.windows.object_handle.h0"></a>
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<span><a name="asio.overview.windows.object_handle.see_also"></a></span><a class="link" href="object_handle.html#asio.overview.windows.object_handle.see_also">See
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Also</a>
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</h6>
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<p>
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<a class="link" href="../../reference/windows__object_handle.html" title="windows::object_handle">windows::object_handle</a>.
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</p>
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<h6>
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<a name="asio.overview.windows.object_handle.h1"></a>
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<span><a name="asio.overview.windows.object_handle.notes"></a></span><a class="link" href="object_handle.html#asio.overview.windows.object_handle.notes">Notes</a>
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</h6>
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<p>
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Windows object <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
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are only available at compile time when targeting Windows. Programs may
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test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_WINDOWS_OBJECT_HANDLE</span></code>
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to determine whether they are supported.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div>
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