asynchronous_socket_operations.html
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<title>Requirements on asynchronous socket operations</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.asynchronous_socket_operations"></a><a class="link" href="asynchronous_socket_operations.html" title="Requirements on asynchronous socket operations">Requirements
on asynchronous socket operations</a>
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<p>
In this library, <span class="emphasis"><em>asynchronous socket operations</em></span> are
those member functions having prefix <code class="computeroutput">async_</code>.
</p>
<p>
For an object <code class="computeroutput">s</code>, a program may initiate asynchronous socket
operations such that there are multiple simultaneously outstanding asynchronous
operations.
</p>
<p>
When there are multiple outstanding asynchronous <a class="link" href="read_write_operations.html" title="Requirements on read and write operations">read
operations</a> on <code class="computeroutput">s</code>:
</p>
<p>
— having no argument <code class="computeroutput">flags</code> of type <code class="computeroutput">socket_base::message_flags</code>,
or
</p>
<p>
— having an argument <code class="computeroutput">flags</code> of type <code class="computeroutput">socket_base::message_flags</code>
but where <code class="computeroutput">(flags & socket_base::message_out_of_band) == 0</code>
</p>
<p>
then the <code class="computeroutput">buffers</code> are filled in the order in which these operations
were issued. The order of invocation of the completion handlers for these
operations is unspecified.
</p>
<p>
When there are multiple outstanding asynchronous <a class="link" href="read_write_operations.html" title="Requirements on read and write operations">read
operations</a> on <code class="computeroutput">s</code> having an argument <code class="computeroutput">flags</code>
of type <code class="computeroutput">socket_base::message_flags</code> where <code class="computeroutput">(flags &
socket_base::message_out_of_band) != 0</code> then the <code class="computeroutput">buffers</code>
are filled in the order in which these operations were issued.
</p>
<p>
When there are multiple outstanding asynchronous <a class="link" href="read_write_operations.html" title="Requirements on read and write operations">write
operations</a> on <code class="computeroutput">s</code>, the <code class="computeroutput">buffers</code> are transmitted
in the order in which these operations were issued. The order of invocation
of the completion handlers for these operations is unspecified.
</p>
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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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