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<h1 title="Package" class="title">Package&nbsp;edu.emory.mathcs.backport.java.util.concurrent.locks</h1>
<div class="docSummary">
<div class="block">Interfaces and classes providing a framework for locking and waiting
for conditions that is distinct from built-in synchronization and
monitors.</div>
</div>
<p>See:&nbsp;<a href="#package_description">Description</a></p>
</div>
<div class="contentContainer">
<ul class="blockList">
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<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Condition.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks">Condition</a></td>
<td class="colLast">
<div class="block"><code>Condition</code> factors out the <code>Object</code> monitor
 methods (<code>wait</code>, <code>notify</code>
 and <code>notifyAll</code>) into distinct objects to
 give the effect of having multiple wait-sets per object, by
 combining them with the use of arbitrary <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>Lock</code></a> implementations.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks">Lock</a></td>
<td class="colLast">
<div class="block"><code>Lock</code> implementations provide more extensive locking
 operations than can be obtained using <code>synchronized</code> methods
 and statements.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReadWriteLock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks">ReadWriteLock</a></td>
<td class="colLast">
<div class="block">A <tt>ReadWriteLock</tt> maintains a pair of associated <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>locks</code></a>, one for read-only operations and one for writing.</div>
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<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks">ReentrantLock</a></td>
<td class="colLast">
<div class="block">A reentrant mutual exclusion <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>Lock</code></a> with the same basic
 behavior and semantics as the implicit monitor lock accessed using
 <code>synchronized</code> methods and statements, but with extended
 capabilities.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks">ReentrantReadWriteLock</a></td>
<td class="colLast">
<div class="block">An implementation of <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReadWriteLock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>ReadWriteLock</code></a> supporting similar
 semantics to <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>ReentrantLock</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.ReadLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks">ReentrantReadWriteLock.ReadLock</a></td>
<td class="colLast">
<div class="block">The lock returned by method <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.html#readLock()"><code>ReentrantReadWriteLock.readLock()</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.WriteLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks">ReentrantReadWriteLock.WriteLock</a></td>
<td class="colLast">
<div class="block">The lock returned by method <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.html#writeLock()"><code>ReentrantReadWriteLock.writeLock()</code></a>.</div>
</td>
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<h2 title="Package edu.emory.mathcs.backport.java.util.concurrent.locks Description">Package edu.emory.mathcs.backport.java.util.concurrent.locks Description</h2>
<div class="block">Interfaces and classes providing a framework for locking and waiting
for conditions that is distinct from built-in synchronization and
monitors. The framework permits much greater flexibility in the use of
locks and conditions, at the expense of more awkward syntax.

<p> The <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>Lock</code></a> interface supports
locking disciplines that differ in semantics (reentrant, fair, etc),
and that can be used in non-block-structured contexts including
hand-over-hand and lock reordering algorithms. The main implementation
is <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>ReentrantLock</code></a>.

<p> The <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReadWriteLock.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>ReadWriteLock</code></a> interface
similarly defines locks that may be shared among readers but are
exclusive to writers.  Only a single implementation, <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantReadWriteLock.html" title="class in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>ReentrantReadWriteLock</code></a>, is provided, since
it covers most standard usage contexts. But programmers may create
their own implementations to cover nonstandard requirements.

<p> The <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Condition.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent.locks"><code>Condition</code></a> interface
describes condition variables that may be associated with Locks.
These are similar in usage to the implicit monitors accessed using
<tt>Object.wait</tt>, but offer extended capabilities.  In particular,
multiple <tt>Condition</tt> objects may be associated with a single
<tt>Lock</tt>.  To avoid compatibility issues, the names of
<tt>Condition</tt> methods are different than the corresponding
<tt>Object</tt> versions.

<!--
<p> The <code>edu.emory.mathcs.backport.java.util.concurrent.locks.AbstractQueuedSynchronizer</code>
class serves as a useful superclass for defining locks and other
synchronizers that rely on queuing blocked threads.  The <code>edu.emory.mathcs.backport.java.util.concurrent.locks.AbstractQueuedLongSynchronizer</code> class
provides the same functionality but extends support to 64 bits of
synchronization state. Both extend class <code>edu.emory.mathcs.backport.java.util.concurrent.locks.AbstractOwnableSynchronizer</code>, a simple
class that helps record the thread currently holding exclusive
synchronization.  The <code>edu.emory.mathcs.backport.java.util.concurrent.locks.LockSupport</code>
class provides lower-level blocking and unblocking support that is
useful for those developers implementing their own customized lock
classes.--></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>1.5</dd></dl>
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