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<title>Class Poco::NamedMutex</title>
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<meta name="copyright" content="Copyright (c) 2009, Applied Informatics Software Engineering GmbH and Contributors"/>
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<meta name="date" content="2009-11-24"/>
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<h1 class="namespace"><a href="Poco.html" class="namespace">Poco</a></h1>
<h1 class="symbol">class NamedMutex</h1>
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<p>
<b>Library:</b> Foundation<br />
<b>Package:</b> Processes<br />
<b>Header:</b> Poco/NamedMutex.h</p>
<h2>Description</h2>
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<p>A <a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a> (mutual exclusion) is a global synchronization mechanism used to control access to a shared resource in a concurrent (multi process) scenario. Using the <a href="Poco.NamedMutex.html#8599" title="Poco::NamedMutex::ScopedLock">ScopedLock</a> class is the preferred way to automatically lock and unlock a mutex. </p>
<p>Unlike a <a href="Poco.Mutex.html" title="class Poco::Mutex">Mutex</a> or a <a href="Poco.FastMutex.html" title="class Poco::FastMutex">FastMutex</a>, which itself is the unit of synchronization, a <a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a> refers to a named operating system resource being the unit of synchronization. In other words, there can be multiple instances of <a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a> referring to the same actual synchronization object. </p>
<p></p>
<p>There should not be more than one instance of <a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a> for a given name in a process. Otherwise, the instances may interfere with each other. </p>
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<h2>Inheritance</h2>
<p><b>Direct Base Classes: </b>NamedMutexImpl</p>
<p><b>All Base Classes: </b>NamedMutexImpl</p>
<h2>Member Summary</h2>
<p><b>Member Functions: </b><a href="Poco.NamedMutex.html#8603" title="Poco::NamedMutex::lock()">lock</a>, <a href="Poco.NamedMutex.html#8604" title="Poco::NamedMutex::tryLock()">tryLock</a>, <a href="Poco.NamedMutex.html#8605" title="Poco::NamedMutex::unlock()">unlock</a></p>
<h2>Types</h2>
<h3><a name="8599">ScopedLock</a></h3>
<p class="decl">typedef <a href="Poco.ScopedLock.html" title="class Poco::ScopedLock">Poco::ScopedLock</a> < <a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a> > <a href="Poco.NamedMutex.html#8599" title="Poco::NamedMutex::ScopedLock">ScopedLock</a>;</p>
<div class="description">
<p></p>
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<h2>Constructors</h2>
<h3><a name="8600">NamedMutex</a></h3>
<p class="decl"><a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a>(<br /> const std::string & name<br />);</p>
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<p>creates the <a href="Poco.Mutex.html" title="class Poco::Mutex">Mutex</a>. </p>
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<h2>Destructor</h2>
<h3><a name="8602">~NamedMutex</a></h3>
<p class="decl">~<a href="Poco.NamedMutex.html" title="class Poco::NamedMutex">NamedMutex</a>();</p>
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<p>destroys the <a href="Poco.Mutex.html" title="class Poco::Mutex">Mutex</a>. </p>
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<h2>Member Functions</h2>
<h3><a name="8603">lock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void lock();</p>
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<p>Locks the mutex. Blocks if the mutex is held by another process or thread. </p>
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<h3><a name="8604">tryLock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool tryLock();</p>
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<p>Tries to lock the mutex. Returns false immediately if the mutex is already held by another process or thread. Returns true if the mutex was successfully locked. </p>
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<h3><a name="8605">unlock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void unlock();</p>
<div class="description">
<p>Unlocks the mutex so that it can be acquired by other threads. </p>
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<p class="footer">POCO C++ Libraries 1.3.6-all<br />
Copyright © 2009, <a href="http://pocoproject.org/" target="_blank">Applied Informatics Software Engineering GmbH and Contributors</a></p>
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