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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent.locks</div>
<h2 title="Class ReentrantLock" class="title">Class ReentrantLock</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock</li>
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<dt>All Implemented Interfaces:</dt>
<dd><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>, java.io.Serializable</dd>
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<pre>public class <span class="strong">ReentrantLock</span>
extends java.lang.Object
implements <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>, java.io.Serializable</pre>
<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.
<p>A <code>ReentrantLock</code> is <em>owned</em> by the thread last
successfully locking, but not yet unlocking it. A thread invoking
<code>lock</code> will return, successfully acquiring the lock, when
the lock is not owned by another thread. The method will return
immediately if the current thread already owns the lock. This can
be checked using methods <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#isHeldByCurrentThread()"><code>isHeldByCurrentThread()</code></a>, and <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getHoldCount()"><code>getHoldCount()</code></a>.
<p>The constructor for this class accepts an optional
<em>fairness</em> parameter. When set <code>true</code>, under
contention, locks favor granting access to the longest-waiting
thread. Otherwise this lock does not guarantee any particular
access order. Programs using fair locks accessed by many threads
may display lower overall throughput (i.e., are slower; often much
slower) than those using the default setting, but have smaller
variances in times to obtain locks and guarantee lack of
starvation. Note however, that fairness of locks does not guarantee
fairness of thread scheduling. Thus, one of many threads using a
fair lock may obtain it multiple times in succession while other
active threads are not progressing and not currently holding the
lock.
Also note that the untimed <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#tryLock()"><code>tryLock</code></a> method does not
honor the fairness setting. It will succeed if the lock
is available even if other threads are waiting.
<p>It is recommended practice to <em>always</em> immediately
follow a call to <code>lock</code> with a <code>try</code> block, most
typically in a before/after construction such as:
<pre>
class X {
private final ReentrantLock lock = new ReentrantLock();
// ...
public void m() {
lock.lock(); // block until condition holds
try {
// ... method body
} finally {
lock.unlock()
}
}
}
</pre>
<p>In addition to implementing 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, this
class defines methods <code>isLocked</code> and
<code>getLockQueueLength</code>, as well as some associated
<code>protected</code> access methods that may be useful for
instrumentation and monitoring.
<p>Serialization of this class behaves in the same way as built-in
locks: a deserialized lock is in the unlocked state, regardless of
its state when serialized.
<p>This lock supports a maximum of 2147483647 recursive locks by
the same thread. Attempts to exceed this limit result in
<code>Error</code> throws from locking methods.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Doug Lea, Dawid Kurzyniec</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../../../serialized-form.html#edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock">Serialized Form</a></dd></dl>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#ReentrantLock()">ReentrantLock</a></strong>()</code>
<div class="block">Creates an instance of <code>ReentrantLock</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#ReentrantLock(boolean)">ReentrantLock</a></strong>(boolean fair)</code>
<div class="block">Creates an instance of <code>ReentrantLock</code> with the
given fairness policy.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getHoldCount()">getHoldCount</a></strong>()</code>
<div class="block">Queries the number of holds on this lock by the current thread.</div>
</td>
</tr>
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<td class="colFirst"><code>protected java.lang.Thread</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getOwner()">getOwner</a></strong>()</code>
<div class="block">Returns the thread that currently owns this lock, or
<code>null</code> if not owned.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Collection</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getQueuedThreads()">getQueuedThreads</a></strong>()</code>
<div class="block">Returns a collection containing threads that may be waiting to
acquire this lock.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getQueueLength()">getQueueLength</a></strong>()</code>
<div class="block">Returns an estimate of the number of threads waiting to
acquire this lock.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Collection</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getWaitingThreads(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">getWaitingThreads</a></strong>(<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> condition)</code>
<div class="block">Returns a collection containing those threads that may be
waiting on the given condition associated with this lock.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#getWaitQueueLength(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">getWaitQueueLength</a></strong>(<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> condition)</code>
<div class="block">Returns an estimate of the number of threads waiting on the
given condition associated with this lock.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#hasQueuedThread(java.lang.Thread)">hasQueuedThread</a></strong>(java.lang.Thread thread)</code>
<div class="block">Queries whether the given thread is waiting to acquire this
lock.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#hasQueuedThreads()">hasQueuedThreads</a></strong>()</code>
<div class="block">Queries whether any threads are waiting to acquire this lock.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#hasWaiters(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">hasWaiters</a></strong>(<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> condition)</code>
<div class="block">Queries whether any threads are waiting on the given condition
associated with this lock.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#isFair()">isFair</a></strong>()</code>
<div class="block">Returns <code>true</code> if this lock has fairness set true.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#isHeldByCurrentThread()">isHeldByCurrentThread</a></strong>()</code>
<div class="block">Queries if this lock is held by the current thread.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#isLocked()">isLocked</a></strong>()</code>
<div class="block">Queries if this lock is held by any thread.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#lock()">lock</a></strong>()</code>
<div class="block">Acquires the lock.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#lockInterruptibly()">lockInterruptibly</a></strong>()</code>
<div class="block">Acquires the lock unless the current thread is
interrupted.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><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></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#newCondition()">newCondition</a></strong>()</code>
<div class="block">Returns a <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> instance for use with this
<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> instance.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#toString()">toString</a></strong>()</code>
<div class="block">Returns a string identifying this lock, as well as its lock state.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#tryLock()">tryLock</a></strong>()</code>
<div class="block">Acquires the lock only if it is not held by another thread at the time
of invocation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#tryLock(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">tryLock</a></strong>(long timeout,
<a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Acquires the lock if it is not held by another thread within the given
waiting time and the current thread has not been
interrupted.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#unlock()">unlock</a></strong>()</code>
<div class="block">Attempts to release this lock.</div>
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<h4>ReentrantLock</h4>
<pre>public ReentrantLock()</pre>
<div class="block">Creates an instance of <code>ReentrantLock</code>.
This is equivalent to using <code>ReentrantLock(false)</code>.</div>
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<h4>ReentrantLock</h4>
<pre>public ReentrantLock(boolean fair)</pre>
<div class="block">Creates an instance of <code>ReentrantLock</code> with the
given fairness policy.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>fair</code> - <code>true</code> if this lock should use a fair ordering policy</dd></dl>
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<h4>lock</h4>
<pre>public void lock()</pre>
<div class="block">Acquires the lock.
<p>Acquires the lock if it is not held by another thread and returns
immediately, setting the lock hold count to one.
<p>If the current thread already holds the lock then the hold
count is incremented by one and the method returns immediately.
<p>If the lock is held by another thread then the
current thread becomes disabled for thread scheduling
purposes and lies dormant until the lock has been acquired,
at which time the lock hold count is set to one.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#lock()">lock</a></code> in interface <code><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></code></dd>
</dl>
</li>
</ul>
<a name="lockInterruptibly()">
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<h4>lockInterruptibly</h4>
<pre>public void lockInterruptibly()
throws java.lang.InterruptedException</pre>
<div class="block">Acquires the lock unless the current thread is
interrupted.
<p>Acquires the lock if it is not held by another thread and returns
immediately, setting the lock hold count to one.
<p>If the current thread already holds this lock then the hold count
is incremented by one and the method returns immediately.
<p>If the lock is held by another thread then the
current thread becomes disabled for thread scheduling
purposes and lies dormant until one of two things happens:
<ul>
<li>The lock is acquired by the current thread; or
<li>Some other thread interrupts the
current thread.
</ul>
<p>If the lock is acquired by the current thread then the lock hold
count is set to one.
<p>If the current thread:
<ul>
<li>has its interrupted status set on entry to this method; or
<li>is interrupted while acquiring
the lock,
</ul>
then <code>InterruptedException</code> is thrown and the current thread's
interrupted status is cleared.
<p>In this implementation, as this method is an explicit
interruption point, preference is given to responding to the
interrupt over normal or reentrant acquisition of the lock.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#lockInterruptibly()">lockInterruptibly</a></code> in interface <code><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></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if the current thread is interrupted</dd></dl>
</li>
</ul>
<a name="tryLock()">
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<h4>tryLock</h4>
<pre>public boolean tryLock()</pre>
<div class="block">Acquires the lock only if it is not held by another thread at the time
of invocation.
<p>Acquires the lock if it is not held by another thread and
returns immediately with the value <code>true</code>, setting the
lock hold count to one. Even when this lock has been set to use a
fair ordering policy, a call to <code>tryLock()</code> <em>will</em>
immediately acquire the lock if it is available, whether or not
other threads are currently waiting for the lock.
This "barging" behavior can be useful in certain
circumstances, even though it breaks fairness. If you want to honor
the fairness setting for this lock, then use
<a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#tryLock(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)"><code>tryLock(0, TimeUnit.SECONDS) </code></a>
which is almost equivalent (it also detects interruption).
<p> If the current thread already holds this lock then the hold
count is incremented by one and the method returns <code>true</code>.
<p>If the lock is held by another thread then this method will return
immediately with the value <code>false</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#tryLock()">tryLock</a></code> in interface <code><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></code></dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the lock was free and was acquired by the
current thread, or the lock was already held by the current
thread; and <code>false</code> otherwise</dd></dl>
</li>
</ul>
<a name="tryLock(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>tryLock</h4>
<pre>public boolean tryLock(long timeout,
<a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)
throws java.lang.InterruptedException</pre>
<div class="block">Acquires the lock if it is not held by another thread within the given
waiting time and the current thread has not been
interrupted.
<p>Acquires the lock if it is not held by another thread and returns
immediately with the value <code>true</code>, setting the lock hold count
to one. If this lock has been set to use a fair ordering policy then
an available lock <em>will not</em> be acquired if any other threads
are waiting for the lock. This is in contrast to the <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/ReentrantLock.html#tryLock()"><code>tryLock()</code></a>
method. If you want a timed <code>tryLock</code> that does permit barging on
a fair lock then combine the timed and un-timed forms together:
<pre>if (lock.tryLock() || lock.tryLock(timeout, unit) ) { ... }
</pre>
<p>If the current thread
already holds this lock then the hold count is incremented by one and
the method returns <code>true</code>.
<p>If the lock is held by another thread then the
current thread becomes disabled for thread scheduling
purposes and lies dormant until one of three things happens:
<ul>
<li>The lock is acquired by the current thread; or
<li>Some other thread interrupts
the current thread; or
<li>The specified waiting time elapses
</ul>
<p>If the lock is acquired then the value <code>true</code> is returned and
the lock hold count is set to one.
<p>If the current thread:
<ul>
<li>has its interrupted status set on entry to this method; or
<li>is interrupted while
acquiring the lock,
</ul>
then <code>InterruptedException</code> is thrown and the current thread's
interrupted status is cleared.
<p>If the specified waiting time elapses then the value <code>false</code>
is returned. If the time is less than or equal to zero, the method
will not wait at all.
<p>In this implementation, as this method is an explicit
interruption point, preference is given to responding to the
interrupt over normal or reentrant acquisition of the lock, and
over reporting the elapse of the waiting time.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#tryLock(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">tryLock</a></code> in interface <code><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></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - the time to wait for the lock</dd><dd><code>unit</code> - the time unit of the timeout argument</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the lock was free and was acquired by the
current thread, or the lock was already held by the current
thread; and <code>false</code> if the waiting time elapsed before
the lock could be acquired</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if the current thread is interrupted</dd>
<dd><code>java.lang.NullPointerException</code> - if the time unit is null</dd></dl>
</li>
</ul>
<a name="unlock()">
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<ul class="blockList">
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<h4>unlock</h4>
<pre>public void unlock()</pre>
<div class="block">Attempts to release this lock.
<p>If the current thread is the holder of this lock then the hold
count is decremented. If the hold count is now zero then the lock
is released. If the current thread is not the holder of this
lock then <code>IllegalMonitorStateException</code> is thrown.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#unlock()">unlock</a></code> in interface <code><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></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalMonitorStateException</code> - if the current thread does not
hold this lock</dd></dl>
</li>
</ul>
<a name="newCondition()">
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<h4>newCondition</h4>
<pre>public <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> newCondition()</pre>
<div class="block">Returns a <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> instance for use with this
<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> instance.
<p>The returned <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> instance supports the same
usages as do the <code>Object</code> monitor methods (<code>wait</code>, <code>notify</code>, and <code>notifyAll</code>) when used with the built-in
monitor lock.
<ul>
<li>If this lock is not held when any of 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>
<a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Condition.html#await()">waiting</a> or <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Condition.html#signal()">signalling</a> methods are called, then an <code>IllegalMonitorStateException</code> is thrown.
<li>When the condition <a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Condition.html#await()">waiting</a>
methods are called the lock is released and, before they
return, the lock is reacquired and the lock hold count restored
to what it was when the method was called.
<li>If a thread is interrupted
while waiting then the wait will terminate, an <code>InterruptedException</code> will be thrown, and the thread's
interrupted status will be cleared.
<li> Waiting threads are signalled in FIFO order.
<li>The ordering of lock reacquisition for threads returning
from waiting methods is the same as for threads initially
acquiring the lock, which is in the default case not specified,
but for <em>fair</em> locks favors those threads that have been
waiting the longest.
</ul></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/locks/Lock.html#newCondition()">newCondition</a></code> in interface <code><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></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the Condition object</dd></dl>
</li>
</ul>
<a name="getHoldCount()">
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<ul class="blockList">
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<h4>getHoldCount</h4>
<pre>public int getHoldCount()</pre>
<div class="block">Queries the number of holds on this lock by the current thread.
<p>A thread has a hold on a lock for each lock action that is not
matched by an unlock action.
<p>The hold count information is typically only used for testing and
debugging purposes. For example, if a certain section of code should
not be entered with the lock already held then we can assert that
fact:
<pre>
class X {
ReentrantLock lock = new ReentrantLock();
// ...
public void m() {
assert lock.getHoldCount() == 0;
lock.lock();
try {
// ... method body
} finally {
lock.unlock();
}
}
}
</pre></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the number of holds on this lock by the current thread,
or zero if this lock is not held by the current thread</dd></dl>
</li>
</ul>
<a name="isHeldByCurrentThread()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>isHeldByCurrentThread</h4>
<pre>public boolean isHeldByCurrentThread()</pre>
<div class="block">Queries if this lock is held by the current thread.
<p>Analogous to the <code>Thread.holdsLock(java.lang.Object)</code> method for built-in
monitor locks, this method is typically used for debugging and
testing. For example, a method that should only be called while
a lock is held can assert that this is the case:
<pre>
class X {
ReentrantLock lock = new ReentrantLock();
// ...
public void m() {
assert lock.isHeldByCurrentThread();
// ... method body
}
}
</pre>
<p>It can also be used to ensure that a reentrant lock is used
in a non-reentrant manner, for example:
<pre>
class X {
ReentrantLock lock = new ReentrantLock();
// ...
public void m() {
assert !lock.isHeldByCurrentThread();
lock.lock();
try {
// ... method body
} finally {
lock.unlock();
}
}
}
</pre></div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if current thread holds this lock and
<code>false</code> otherwise</dd></dl>
</li>
</ul>
<a name="isLocked()">
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<h4>isLocked</h4>
<pre>public boolean isLocked()</pre>
<div class="block">Queries if this lock is held by any thread. This method is
designed for use in monitoring of the system state,
not for synchronization control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if any thread holds this lock and
<code>false</code> otherwise</dd></dl>
</li>
</ul>
<a name="isFair()">
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<ul class="blockList">
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<h4>isFair</h4>
<pre>public final boolean isFair()</pre>
<div class="block">Returns <code>true</code> if this lock has fairness set true.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if this lock has fairness set true</dd></dl>
</li>
</ul>
<a name="getOwner()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getOwner</h4>
<pre>protected java.lang.Thread getOwner()</pre>
<div class="block">Returns the thread that currently owns this lock, or
<code>null</code> if not owned. When this method is called by a
thread that is not the owner, the return value reflects a
best-effort approximation of current lock status. For example,
the owner may be momentarily <code>null</code> even if there are
threads trying to acquire the lock but have not yet done so.
This method is designed to facilitate construction of
subclasses that provide more extensive lock monitoring
facilities.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the owner, or <code>null</code> if not owned</dd></dl>
</li>
</ul>
<a name="hasQueuedThreads()">
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</a>
<ul class="blockList">
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<h4>hasQueuedThreads</h4>
<pre>public final boolean hasQueuedThreads()</pre>
<div class="block">Queries whether any threads are waiting to acquire this lock. Note that
because cancellations may occur at any time, a <code>true</code>
return does not guarantee that any other thread will ever
acquire this lock. This method is designed primarily for use in
monitoring of the system state.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if there may be other threads waiting to
acquire the lock</dd></dl>
</li>
</ul>
<a name="hasQueuedThread(java.lang.Thread)">
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<ul class="blockList">
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<h4>hasQueuedThread</h4>
<pre>public final boolean hasQueuedThread(java.lang.Thread thread)</pre>
<div class="block">Queries whether the given thread is waiting to acquire this
lock. Note that because cancellations may occur at any time, a
<code>true</code> return does not guarantee that this thread
will ever acquire this lock. This method is designed primarily for use
in monitoring of the system state.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>thread</code> - the thread</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the given thread is queued waiting for this lock</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the thread is null</dd></dl>
</li>
</ul>
<a name="getQueueLength()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getQueueLength</h4>
<pre>public final int getQueueLength()</pre>
<div class="block">Returns an estimate of the number of threads waiting to
acquire this lock. The value is only an estimate because the number of
threads may change dynamically while this method traverses
internal data structures. This method is designed for use in
monitoring of the system state, not for synchronization
control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the estimated number of threads waiting for this lock</dd></dl>
</li>
</ul>
<a name="getQueuedThreads()">
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<ul class="blockList">
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<h4>getQueuedThreads</h4>
<pre>protected java.util.Collection getQueuedThreads()</pre>
<div class="block">Returns a collection containing threads that may be waiting to
acquire this lock. Because the actual set of threads may change
dynamically while constructing this result, the returned
collection is only a best-effort estimate. The elements of the
returned collection are in no particular order. This method is
designed to facilitate construction of subclasses that provide
more extensive monitoring facilities.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the collection of threads</dd></dl>
</li>
</ul>
<a name="hasWaiters(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>hasWaiters</h4>
<pre>public boolean hasWaiters(<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> condition)</pre>
<div class="block">Queries whether any threads are waiting on the given condition
associated with this lock. Note that because timeouts and
interrupts may occur at any time, a <code>true</code> return does
not guarantee that a future <code>signal</code> will awaken any
threads. This method is designed primarily for use in
monitoring of the system state.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>condition</code> - the condition</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if there are any waiting threads</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalMonitorStateException</code> - if this lock is not held</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the given condition is
not associated with this lock</dd>
<dd><code>java.lang.NullPointerException</code> - if the condition is null</dd></dl>
</li>
</ul>
<a name="getWaitQueueLength(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getWaitQueueLength</h4>
<pre>public int getWaitQueueLength(<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> condition)</pre>
<div class="block">Returns an estimate of the number of threads waiting on the
given condition associated with this lock. Note that because
timeouts and interrupts may occur at any time, the estimate
serves only as an upper bound on the actual number of waiters.
This method is designed for use in monitoring of the system
state, not for synchronization control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>condition</code> - the condition</dd>
<dt><span class="strong">Returns:</span></dt><dd>the estimated number of waiting threads</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalMonitorStateException</code> - if this lock is not held</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the given condition is
not associated with this lock</dd>
<dd><code>java.lang.NullPointerException</code> - if the condition is null</dd></dl>
</li>
</ul>
<a name="getWaitingThreads(edu.emory.mathcs.backport.java.util.concurrent.locks.Condition)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getWaitingThreads</h4>
<pre>protected java.util.Collection getWaitingThreads(<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> condition)</pre>
<div class="block">Returns a collection containing those threads that may be
waiting on the given condition associated with this lock.
Because the actual set of threads may change dynamically while
constructing this result, the returned collection is only a
best-effort estimate. The elements of the returned collection
are in no particular order. This method is designed to
facilitate construction of subclasses that provide more
extensive condition monitoring facilities.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>condition</code> - the condition</dd>
<dt><span class="strong">Returns:</span></dt><dd>the collection of threads</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalMonitorStateException</code> - if this lock is not held</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the given condition is
not associated with this lock</dd>
<dd><code>java.lang.NullPointerException</code> - if the condition is null</dd></dl>
</li>
</ul>
<a name="toString()">
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</a>
<ul class="blockListLast">
<li class="blockList">
<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
<div class="block">Returns a string identifying this lock, as well as its lock state.
The state, in brackets, includes either the String <code>"Unlocked"</code>
or the String <code>"Locked by"</code> followed by the
name of the owning thread.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>a string identifying this lock, as well as its lock state</dd></dl>
</li>
</ul>
</li>
</ul>
</li>
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