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锁持有者管理器AbstractOwnableSynchronizer

程序员文章站 2022-04-17 21:31:29
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/*
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/

package java.util.concurrent.locks;

/**
* A synchronizer that may be exclusively owned by a thread. This
* class provides a basis for creating locks and related synchronizers
* that may entail a notion of ownership. The
* <tt>AbstractOwnableSynchronizer</tt> class itself does not manage or
* use this information. However, subclasses and tools may use
* appropriately maintained values to help control and monitor access
* and provide diagnostics.
*
一个线程,可能独占一个同步锁。AbstractOwnableSynchronizer用于表示锁与持有者之间的关系;
AbstractOwnableSynchronizer不管理这种关系;主要是其子类,用于控制或监视锁的状态,提供
帮助。
* @since 1.6
* @author Doug Lea
*/
public abstract class AbstractOwnableSynchronizer
implements java.io.Serializable {

/** Use serial ID even though all fields transient. */
private static final long serialVersionUID = 3737899427754241961L;

/**
* Empty constructor for use by subclasses.
*/
protected AbstractOwnableSynchronizer() { }

/**
* The current owner of exclusive mode synchronization.
*/
//独占模式,锁的持有者
private transient Thread exclusiveOwnerThread;

/**
* Sets the thread that currently owns exclusive access. A
* <tt>null</tt> argument indicates that no thread owns access.
* This method does not otherwise impose any synchronization or
* <tt>volatile</tt> field accesses.
*/
//设置锁持有者
protected final void setExclusiveOwnerThread(Thread t) {
exclusiveOwnerThread = t;
}

/**
* Returns the thread last set by
* <tt>setExclusiveOwnerThread</tt>, or <tt>null</tt> if never
* set. This method does not otherwise impose any synchronization
* or <tt>volatile</tt> field accesses.
* @return the owner thread
*/
//获取锁的持有线程
protected final Thread getExclusiveOwnerThread() {
return exclusiveOwnerThread;
}
}
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