95 lines
5.0 KiB
HTML
95 lines
5.0 KiB
HTML
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
|
||
|
|
<title>Object HANDLEs</title>
|
||
|
|
<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
|
||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
|
||
|
|
<link rel="home" href="../../../index.html" title="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">
|
||
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
|
|
</head>
|
||
|
|
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||
|
|
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
|
||
|
|
<hr>
|
||
|
|
<div class="spirit-nav">
|
||
|
|
<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>
|
||
|
|
</div>
|
||
|
|
<div class="section">
|
||
|
|
<div class="titlepage"><div><div><h4 class="title">
|
||
|
|
<a name="asio.overview.windows.object_handle"></a><a class="link" href="object_handle.html" title="Object HANDLEs">Object HANDLEs</a>
|
||
|
|
</h4></div></div></div>
|
||
|
|
<p>
|
||
|
|
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" 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_context</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="asio.overview.windows.object_handle.h0"></a>
|
||
|
|
<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
|
||
|
|
Also</a>
|
||
|
|
</h6>
|
||
|
|
<p>
|
||
|
|
<a class="link" href="../../reference/windows__object_handle.html" title="windows::object_handle">windows::object_handle</a>.
|
||
|
|
</p>
|
||
|
|
<h6>
|
||
|
|
<a name="asio.overview.windows.object_handle.h1"></a>
|
||
|
|
<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>
|
||
|
|
</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">ASIO_HAS_WINDOWS_OBJECT_HANDLE</span></code>
|
||
|
|
to determine whether they are supported.
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
<div class="copyright-footer">Copyright © 2003-2023 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>
|
||
|
|
<hr>
|
||
|
|
<div class="spirit-nav">
|
||
|
|
<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>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|