1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Class dummy_mutex</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../signals2/reference.html#header.boost.signals2.dummy_mutex_hpp" title="Header <boost/signals2/dummy_mutex.hpp>"> 10<link rel="prev" href="postconstructor_invoker.html" title="Class postconstructor_invoker"> 11<link rel="next" href="last_value.html" title="Class template last_value"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" 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name="boost.signals2.dummy_mutex"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class dummy_mutex</span></h2> 30<p>boost::signals2::dummy_mutex — Fake mutex which does nothing.</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../signals2/reference.html#header.boost.signals2.dummy_mutex_hpp" title="Header <boost/signals2/dummy_mutex.hpp>">boost/signals2/dummy_mutex.hpp</a>> 34 35</span> 36<span class="keyword">class</span> <a class="link" href="dummy_mutex.html" title="Class dummy_mutex">dummy_mutex</a> <span class="special">:</span> <span class="keyword">public</span> noncopyable <span class="special">{</span> 37<span class="keyword">public</span><span class="special">:</span> 38 <span class="keyword">void</span> <a class="link" href="dummy_mutex.html#id-1_3_36_6_4_3_1_1_4_1-bb"><span class="identifier">lock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 39 <span class="keyword">bool</span> <a class="link" href="dummy_mutex.html#id-1_3_36_6_4_3_1_1_4_2-bb"><span class="identifier">try_lock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 40 <span class="keyword">void</span> <a class="link" href="dummy_mutex.html#id-1_3_36_6_4_3_1_1_4_3-bb"><span class="identifier">unlock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 41<span class="special">}</span><span class="special">;</span></pre></div> 42<div class="refsect1"> 43<a name="id-1.3.36.6.5.3.4"></a><h2>Description</h2> 44<p>You may wish to use the <code class="computeroutput">dummy_mutex</code> class for the <code class="computeroutput">Mutex</code> 45 template type of your signals if you are not concerned about thread safety. 46 This may give slightly faster 47 performance, since <code class="computeroutput">dummy_mutex</code> performs no actual locking. 48 </p> 49<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_36_6_4_3_1_1_4_1-bb"></a><span class="identifier">lock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 50<p>No effect. 51 </p> 52<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_36_6_4_3_1_1_4_2-bb"></a><span class="identifier">try_lock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 53<p>No effect. 54 </p> 55<div class="variablelist"><table border="0" class="variablelist compact"> 56<colgroup> 57<col align="left" valign="top"> 58<col> 59</colgroup> 60<tbody><tr> 61<td><p><span class="term">Returns:</span></p></td> 62<td><p><code class="computeroutput">true</code>.</p></td> 63</tr></tbody> 64</table></div> 65<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_36_6_4_3_1_1_4_3-bb"></a><span class="identifier">unlock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 66<p>No effect. 67 </p> 68</div> 69</div> 70<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 71<td align="left"></td> 72<td align="right"><div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<br>Copyright © 2007-2009 Frank Mori Hess<p>Distributed under the Boost 73 Software License, Version 1.0. (See accompanying file 74 <code class="filename">LICENSE_1_0.txt</code> 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> 75</div></td> 76</tr></table> 77<hr> 78<div class="spirit-nav"> 79<a accesskey="p" href="postconstructor_invoker.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../signals2/reference.html#header.boost.signals2.dummy_mutex_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="last_value.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 80</div> 81</body> 82</html> 83
