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87 lines
2.0 KiB
87 lines
2.0 KiB
/*
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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/*
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*
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*
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*
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*
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*
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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/publicdomain/zero/1.0/
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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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* {@code AbstractOwnableSynchronizer} 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.
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* A {@code null} argument indicates that no thread owns access.
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* This method does not otherwise impose any synchronization or
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* {@code volatile} field accesses.
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* @param thread the owner thread
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*/
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protected final void setExclusiveOwnerThread(Thread thread) {
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exclusiveOwnerThread = thread;
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}
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/**
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* Returns the thread last set by {@code setExclusiveOwnerThread},
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* or {@code null} if never set. This method does not otherwise
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* impose any synchronization or {@code volatile} 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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