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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class null_mutex</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../interprocess/indexes_reference.html#header.boost.interprocess.sync.null_mutex_hpp" title="Header <boost/interprocess/sync/null_mutex.hpp>"> <link rel="prev" href="named_upgradable_mutex.html" title="Class named_upgradable_mutex"> <link rel="next" href="scoped_lock.html" title="Class template scoped_lock"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="named_upgradable_mutex.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../interprocess/indexes_reference.html#header.boost.interprocess.sync.null_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="scoped_lock.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.interprocess.null_mutex"></a><div class="titlepage"></div> <div class="refnamediv"> <h2>Class null_mutex</h2> boost::interprocess::null_mutex </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis">// In header: <<a class="link" href="../../interprocess/indexes_reference.html#header.boost.interprocess.sync.null_mutex_hpp" title="Header <boost/interprocess/sync/null_mutex.hpp>">boost/interprocess/sync/null_mutex.hpp</a>> class <a class="link" href="null_mutex.html" title="Class null_mutex">null_mutex</a> { public: // <a class="link" href="null_mutex.html#boost.interprocess.null_mutexconstruct-copy-destruct">construct/copy/destruct</a> <a class="link" href="null_mutex.html#idp67136736-bb">null_mutex</a>(); <a class="link" href="null_mutex.html#idp67137440-bb">~null_mutex</a>(); // <a class="link" href="null_mutex.html#idp67106896-bb">public member functions</a> void <a class="link" href="null_mutex.html#idp67107456-bb">lock</a>(); bool <a class="link" href="null_mutex.html#idp67108624-bb">try_lock</a>(); bool <a class="link" href="null_mutex.html#idp67109936-bb">timed_lock</a>(const boost::posix_time::ptime &); void <a class="link" href="null_mutex.html#idp67111952-bb">unlock</a>(); void <a class="link" href="null_mutex.html#idp67113248-bb">lock_sharable</a>(); bool <a class="link" href="null_mutex.html#idp67114560-bb">try_lock_sharable</a>(); bool <a class="link" href="null_mutex.html#idp67115888-bb">timed_lock_sharable</a>(const boost::posix_time::ptime &); void <a class="link" href="null_mutex.html#idp67117920-bb">unlock_sharable</a>(); void <a class="link" href="null_mutex.html#idp67119232-bb">lock_upgradable</a>(); bool <a class="link" href="null_mutex.html#idp67120544-bb">try_lock_upgradable</a>(); bool <a class="link" href="null_mutex.html#idp67121872-bb">timed_lock_upgradable</a>(const boost::posix_time::ptime &); void <a class="link" href="null_mutex.html#idp67123904-bb">unlock_upgradable</a>(); void <a class="link" href="null_mutex.html#idp67125216-bb">unlock_and_lock_upgradable</a>(); void <a class="link" href="null_mutex.html#idp67126544-bb">unlock_and_lock_sharable</a>(); void <a class="link" href="null_mutex.html#idp67127856-bb">unlock_upgradable_and_lock_sharable</a>(); void <a class="link" href="null_mutex.html#idp67129184-bb">unlock_upgradable_and_lock</a>(); bool <a class="link" href="null_mutex.html#idp67130512-bb">try_unlock_upgradable_and_lock</a>(); bool <a class="link" href="null_mutex.html#idp67131856-bb">timed_unlock_upgradable_and_lock</a>(const boost::posix_time::ptime &); bool <a class="link" href="null_mutex.html#idp67133904-bb">try_unlock_sharable_and_lock</a>(); bool <a class="link" href="null_mutex.html#idp67135232-bb">try_unlock_sharable_and_lock_upgradable</a>(); };</pre></div> <div class="refsect1"> <a name="idp251127552"></a><h2>Description</h2> Implements a mutex that simulates a mutex without doing any operation and simulates a successful operation. <div class="refsect2"> <a name="idp251128352"></a><h3> <a name="boost.interprocess.null_mutexconstruct-copy-destruct"></a><code class="computeroutput">null_mutex</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><a name="idp67136736-bb"></a>null_mutex();</pre> Constructor. Empty. </li> <li class="listitem"> <pre class="literallayout"><a name="idp67137440-bb"></a>~null_mutex();</pre> Destructor. Empty. </li> </ol></div> </div> <div class="refsect2"> <a name="idp251138960"></a><h3> <a name="idp67106896-bb"></a><code class="computeroutput">null_mutex</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout">void <a name="idp67107456-bb"></a>lock();</pre>Simulates a mutex lock() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67108624-bb"></a>try_lock();</pre> Simulates a mutex try_lock() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67109936-bb"></a>timed_lock(const boost::posix_time::ptime &);</pre> Simulates a mutex timed_lock() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67111952-bb"></a>unlock();</pre> Simulates a mutex unlock() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67113248-bb"></a>lock_sharable();</pre> Simulates a mutex lock_sharable() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67114560-bb"></a>try_lock_sharable();</pre> Simulates a mutex try_lock_sharable() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67115888-bb"></a>timed_lock_sharable(const boost::posix_time::ptime &);</pre> Simulates a mutex timed_lock_sharable() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67117920-bb"></a>unlock_sharable();</pre> Simulates a mutex unlock_sharable() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67119232-bb"></a>lock_upgradable();</pre> Simulates a mutex lock_upgradable() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67120544-bb"></a>try_lock_upgradable();</pre> Simulates a mutex try_lock_upgradable() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67121872-bb"></a>timed_lock_upgradable(const boost::posix_time::ptime &);</pre> Simulates a mutex timed_lock_upgradable() operation. Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67123904-bb"></a>unlock_upgradable();</pre> Simulates a mutex unlock_upgradable() operation. Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67125216-bb"></a>unlock_and_lock_upgradable();</pre> Simulates unlock_and_lock_upgradable(). Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67126544-bb"></a>unlock_and_lock_sharable();</pre> Simulates unlock_and_lock_sharable(). Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67127856-bb"></a>unlock_upgradable_and_lock_sharable();</pre> Simulates unlock_upgradable_and_lock_sharable(). Empty function. </li> <li class="listitem"> <pre class="literallayout">void <a name="idp67129184-bb"></a>unlock_upgradable_and_lock();</pre> Simulates unlock_upgradable_and_lock(). Empty function. </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67130512-bb"></a>try_unlock_upgradable_and_lock();</pre> Simulates try_unlock_upgradable_and_lock(). Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67131856-bb"></a>timed_unlock_upgradable_and_lock(const boost::posix_time::ptime &);</pre> Simulates timed_unlock_upgradable_and_lock(). Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67133904-bb"></a>try_unlock_sharable_and_lock();</pre> Simulates try_unlock_sharable_and_lock(). Equivalent to "return true;" </li> <li class="listitem"> <pre class="literallayout">bool <a name="idp67135232-bb"></a>try_unlock_sharable_and_lock_upgradable();</pre> Simulates try_unlock_sharable_and_lock_upgradable(). Equivalent to "return true;" </li> </ol></div> </div> </div> </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 © 2005-2012 Ion Gaztanaga 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>) </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="named_upgradable_mutex.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../interprocess/indexes_reference.html#header.boost.interprocess.sync.null_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="scoped_lock.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>