<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>io_service::poll_one (2 of 2 overloads)</title> <link rel="stylesheet" href="../../../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2"> <link rel="start" href="../../../../index.html" title="Asio"> <link rel="up" href="../poll_one.html" title="io_service::poll_one"> <link rel="prev" href="overload1.html" title="io_service::poll_one (1 of 2 overloads)"> <link rel="next" href="../post.html" title="io_service::post"> </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="overload1.html"><img src="../../../../prev.png" alt="Prev"></a><a accesskey="u" href="../poll_one.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="../post.html"><img src="../../../../next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h5 class="title"> <a name="asio.reference.io_service.poll_one.overload2"></a><a class="link" href="overload2.html" title="io_service::poll_one (2 of 2 overloads)">io_service::poll_one (2 of 2 overloads)</a> </h5></div></div></div> <p> Run the <a class="link" href="../../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> object's event processing loop to execute one ready handler. </p> <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">poll_one</span><span class="special">(</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span> </pre> <p> The <code class="computeroutput"><span class="identifier">poll_one</span><span class="special">()</span></code> function runs at most one handler that is ready to run, without blocking. </p> <a name="asio.reference.io_service.poll_one.overload2.parameters"></a><h6> <a name="id992023"></a> <a class="link" href="overload2.html#asio.reference.io_service.poll_one.overload2.parameters">Parameters</a> </h6> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term">ec</span></dt> <dd><p> Set to indicate what error occurred, if any. </p></dd> </dl> </div> <a name="asio.reference.io_service.poll_one.overload2.return_value"></a><h6> <a name="id992061"></a> <a class="link" href="overload2.html#asio.reference.io_service.poll_one.overload2.return_value">Return Value</a> </h6> <p> The number of handlers that were executed. </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="overload1.html"><img src="../../../../prev.png" alt="Prev"></a><a accesskey="u" href="../poll_one.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="../post.html"><img src="../../../../next.png" alt="Next"></a> </div> </body> </html>