mirror of git://gcc.gnu.org/git/gcc.git
58 lines
1.8 KiB
Java
58 lines
1.8 KiB
Java
/*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/licenses/publicdomain
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*/
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package java.util.concurrent.locks;
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/**
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* A synchronizer that may be exclusively owned by a thread. This
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* class provides a basis for creating locks and related synchronizers
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* that may entail a notion of ownership. The
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* <tt>AbstractOwnableSynchronizer</tt> class itself does not manage or
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* use this information. However, subclasses and tools may use
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* appropriately maintained values to help control and monitor access
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* and provide diagnostics.
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*
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* @since 1.6
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* @author Doug Lea
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*/
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public abstract class AbstractOwnableSynchronizer
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implements java.io.Serializable {
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/** Use serial ID even though all fields transient. */
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private static final long serialVersionUID = 3737899427754241961L;
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/**
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* Empty constructor for use by subclasses.
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*/
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protected AbstractOwnableSynchronizer() { }
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/**
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* The current owner of exclusive mode synchronization.
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*/
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private transient Thread exclusiveOwnerThread;
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/**
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* Sets the thread that currently owns exclusive access. A
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* <tt>null</tt> argument indicates that no thread owns access.
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* This method does not otherwise impose any synchronization or
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* <tt>volatile</tt> field accesses.
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*/
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protected final void setExclusiveOwnerThread(Thread t) {
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exclusiveOwnerThread = t;
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}
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/**
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* Returns the thread last set by
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* <tt>setExclusiveOwnerThread</tt>, or <tt>null</tt> if never
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* set. This method does not otherwise impose any synchronization
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* or <tt>volatile</tt> field accesses.
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* @return the owner thread
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*/
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protected final Thread getExclusiveOwnerThread() {
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return exclusiveOwnerThread;
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}
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}
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