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<title>Class Poco::RWLock</title>
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<div class="header">
<h1 class="namespace"><a href="Poco.html" class="namespace">Poco</a></h1>
<h1 class="symbol">class RWLock</h1>
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<p>
<b>Library:</b> Foundation<br />
<b>Package:</b> Threading<br />
<b>Header:</b> Poco/RWLock.h</p>
<h2>Description</h2>
<div class="description">
<p>A reader writer lock allows multiple concurrent readers or one exclusive writer. </p>
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<h2>Inheritance</h2>
<p><b>Direct Base Classes: </b>RWLockImpl</p>
<p><b>All Base Classes: </b>RWLockImpl</p>
<h2>Member Summary</h2>
<p><b>Member Functions: </b><a href="Poco.RWLock.html#9578" title="Poco::RWLock::readLock()">readLock</a>, <a href="Poco.RWLock.html#9579" title="Poco::RWLock::tryReadLock()">tryReadLock</a>, <a href="Poco.RWLock.html#9581" title="Poco::RWLock::tryWriteLock()">tryWriteLock</a>, <a href="Poco.RWLock.html#9582" title="Poco::RWLock::unlock()">unlock</a>, <a href="Poco.RWLock.html#9580" title="Poco::RWLock::writeLock()">writeLock</a></p>
<h2>Types</h2>
<h3><a name="9573">ScopedLock</a></h3>
<p class="decl">typedef <a href="Poco.ScopedRWLock.html" title="class Poco::ScopedRWLock">ScopedRWLock</a> <a href="Poco.RWLock.html#9573" title="Poco::RWLock::ScopedLock">ScopedLock</a>;</p>
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<p></p>
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<h3><a name="9574">ScopedReadLock</a></h3>
<p class="decl">typedef <a href="Poco.ScopedReadRWLock.html" title="class Poco::ScopedReadRWLock">ScopedReadRWLock</a> <a href="Poco.RWLock.html#9574" title="Poco::RWLock::ScopedReadLock">ScopedReadLock</a>;</p>
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<p></p>
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<h3><a name="9575">ScopedWriteLock</a></h3>
<p class="decl">typedef <a href="Poco.ScopedWriteRWLock.html" title="class Poco::ScopedWriteRWLock">ScopedWriteRWLock</a> <a href="Poco.RWLock.html#9575" title="Poco::RWLock::ScopedWriteLock">ScopedWriteLock</a>;</p>
<div class="description">
<p></p>
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<h2>Constructors</h2>
<h3><a name="9576">RWLock</a></h3>
<p class="decl"><a href="Poco.RWLock.html" title="class Poco::RWLock">RWLock</a>();</p>
<div class="description">
<p>Creates the Reader/Writer lock. </p>
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<h2>Destructor</h2>
<h3><a name="9577">~RWLock</a></h3>
<p class="decl">~<a href="Poco.RWLock.html" title="class Poco::RWLock">RWLock</a>();</p>
<div class="description">
<p>Destroys the Reader/Writer lock. </p>
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<h2>Member Functions</h2>
<h3><a name="9578">readLock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void readLock();</p>
<div class="description">
<p>Acquires a read lock. If another thread currently holds a write lock, waits until the write lock is released. </p>
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<h3><a name="9579">tryReadLock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool tryReadLock();</p>
<div class="description">
<p>Tries to acquire a read lock. Immediately returns true if successful, or false if another thread currently holds a write lock. </p>
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<h3><a name="9581">tryWriteLock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool tryWriteLock();</p>
<div class="description">
<p>Tries to acquire a write lock. Immediately returns true if successful, or false if one or more other threads currently hold locks. The result is undefined if the same thread already holds a read or write lock. </p>
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<h3><a name="9582">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>Releases the read or write lock. </p>
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<h3><a name="9580">writeLock</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void writeLock();</p>
<div class="description">
<p>Acquires a write lock. If one or more other threads currently hold locks, waits until all locks are released. The results are undefined if the same thread already holds a read or write lock </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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