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<title>io_service::post</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_asio.reference.io_service.post"></a><a class="link" href="post.html" title="io_service::post">io_service::post</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="id1355424"></a>
Request the <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> to invoke the given
handler and return immediately.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="../CompletionHandler.html" title="Completion handler requirements">CompletionHandler</a><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">post</span><span class="special">(</span>
<span class="identifier">CompletionHandler</span> <span class="identifier">handler</span><span class="special">);</span>
</pre>
<p>
This function is used to ask the <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> to execute the given
handler, but without allowing the <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> to call the handler
from inside this function.
</p>
<p>
The <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a>
guarantees that the handler will only be called in a thread in which the
<code class="computeroutput"><span class="identifier">run</span><span class="special">()</span></code>,
<code class="computeroutput"><span class="identifier">run_one</span><span class="special">()</span></code>,
<code class="computeroutput"><span class="identifier">poll</span><span class="special">()</span></code>
or <code class="computeroutput"><span class="identifier">poll_one</span><span class="special">()</span></code>
member functions is currently being invoked.
</p>
<h6>
<a name="boost_asio.reference.io_service.post.h0"></a>
<span><a name="boost_asio.reference.io_service.post.parameters"></a></span><a class="link" href="post.html#boost_asio.reference.io_service.post.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">handler</span></dt>
<dd>
<p>
The handler to be called. The <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> will make a copy
of the handler object as required. The function signature of the
handler must be:
</p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">();</span>
</pre>
<p>
</p>
</dd>
</dl>
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<h6>
<a name="boost_asio.reference.io_service.post.h1"></a>
<span><a name="boost_asio.reference.io_service.post.remarks"></a></span><a class="link" href="post.html#boost_asio.reference.io_service.post.remarks">Remarks</a>
</h6>
<p>
This function throws an exception only if:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
the handler's <code class="computeroutput"><span class="identifier">asio_handler_allocate</span></code>
function; or
</li>
<li class="listitem">
the handler's copy constructor
</li>
</ul></div>
<p>
throws an exception.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2012 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>)
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