1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>io_context::poll (2 of 2 overloads)</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../poll.html" title="io_context::poll"> 9<link rel="prev" href="overload1.html" title="io_context::poll (1 of 2 overloads)"> 10<link rel="next" href="../poll_one.html" title="io_context::poll_one"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="overload1.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../poll.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../poll_one.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="boost_asio.reference.io_context.poll.overload2"></a><a class="link" href="overload2.html" title="io_context::poll (2 of 2 overloads)">io_context::poll 28 (2 of 2 overloads)</a> 29</h5></div></div></div> 30<p> 31 (Deprecated: Use non-error_code overload.) Run the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a> 32 object's event processing loop to execute ready handlers. 33 </p> 34<pre class="programlisting">count_type poll( 35 boost::system::error_code & ec); 36</pre> 37<p> 38 The <code class="computeroutput">poll()</code> function runs handlers that are ready to run, 39 without blocking, until the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a> 40 has been stopped or there are no more ready handlers. 41 </p> 42<h6> 43<a name="boost_asio.reference.io_context.poll.overload2.h0"></a> 44 <span class="phrase"><a name="boost_asio.reference.io_context.poll.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.io_context.poll.overload2.parameters">Parameters</a> 45 </h6> 46<div class="variablelist"> 47<p class="title"><b></b></p> 48<dl class="variablelist"> 49<dt><span class="term">ec</span></dt> 50<dd><p> 51 Set to indicate what error occurred, if any. 52 </p></dd> 53</dl> 54</div> 55<h6> 56<a name="boost_asio.reference.io_context.poll.overload2.h1"></a> 57 <span class="phrase"><a name="boost_asio.reference.io_context.poll.overload2.return_value"></a></span><a class="link" href="overload2.html#boost_asio.reference.io_context.poll.overload2.return_value">Return 58 Value</a> 59 </h6> 60<p> 61 The number of handlers that were executed. 62 </p> 63</div> 64<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 65<td align="left"></td> 66<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 67 Kohlhoff<p> 68 Distributed under the Boost Software License, Version 1.0. (See accompanying 69 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>) 70 </p> 71</div></td> 72</tr></table> 73<hr> 74<div class="spirit-nav"> 75<a accesskey="p" href="overload1.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../poll.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../poll_one.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 76</div> 77</body> 78</html> 79
