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<title>Requirements on synchronous socket operations</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_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">error_code&</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="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> a1, <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> a2, ..., <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> aN);
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<span class="bold"><strong><span class="emphasis"><em>R f</em></span></strong></span>(<span class="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> a1, <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> a2, ..., <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> aN, error_code& ec);
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</pre>
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<p>
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For an object <code class="computeroutput">s</code>, the conditions under which its synchronous
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socket operations may block the calling thread (C++Std [defns.block]) are
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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">s.non_blocking() == true</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">EWOULDBLOCK</code> or
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<code class="computeroutput">EAGAIN</code> in its failure 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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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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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