77 lines
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77 lines
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<title>Requirements on synchronous socket operations</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="read_write_operations.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.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="asynchronous_socket_operations.html"><img src="../../next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.synchronous_socket_operations"></a><a class="link" href="synchronous_socket_operations.html" title="Requirements on synchronous socket operations">Requirements
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on synchronous socket operations</a>
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</h3></div></div></div>
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<p>
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In this section, <span class="emphasis"><em>synchronous socket operations</em></span> are those
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member functions specified as two overloads, with and without an argument
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of type <code class="computeroutput"><span class="identifier">error_code</span><span class="special">&</span></code>:
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</p>
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<pre class="programlisting"><span class="bold"><strong><span class="emphasis"><em>R f</em></span></strong></span><span class="special">(</span><span class="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> <span class="identifier">a1</span><span class="special">,</span> <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> <span class="identifier">a2</span><span class="special">,</span> <span class="special">...,</span> <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> <span class="identifier">aN</span><span class="special">);</span>
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<span class="bold"><strong><span class="emphasis"><em>R f</em></span></strong></span><span class="special">(</span><span class="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> <span class="identifier">a1</span><span class="special">,</span> <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> <span class="identifier">a2</span><span class="special">,</span> <span class="special">...,</span> <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> <span class="identifier">aN</span><span class="special">,</span> <span class="identifier">error_code</span><span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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</pre>
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<p>
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For an object <code class="computeroutput"><span class="identifier">s</span></code>, the conditions
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under which its synchronous socket operations may block the calling thread
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(C++Std [defns.block]) are determined as follows.
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</p>
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<p>
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If:
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</p>
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<p>
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— <code class="computeroutput"><span class="identifier">s</span><span class="special">.</span><span class="identifier">non_blocking</span><span class="special">()</span>
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<span class="special">==</span> <span class="keyword">true</span></code>,
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</p>
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<p>
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— the synchronous socket operation is specified in terms of a <span class="emphasis"><em>POSIX</em></span>
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function other than <code class="computeroutput"><a href="http://www.opengroup.org/onlinepubs/9699919799/functions/poll.html" target="_top"><code class="computeroutput"><span class="identifier">poll</span><span class="special">()</span></code></a></code>,
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</p>
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<p>
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— that <span class="emphasis"><em>POSIX</em></span> function lists <code class="computeroutput"><span class="identifier">EWOULDBLOCK</span></code>
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or <code class="computeroutput"><span class="identifier">EAGAIN</span></code> in its failure
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conditions, and
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</p>
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<p>
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— the effects of the operation cannot be established immediately
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</p>
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<p>
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then the synchronous socket operation shall not block the calling thread.
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[<span class="emphasis"><em>Note:</em></span> And the effects of the operation are not established.
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—<span class="emphasis"><em>end note</em></span>]
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</p>
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<p>
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Otherwise, the synchronous socket operation shall block the calling thread
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until the effects are established.
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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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