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JDK 6 时提供。

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.     */    private transient Thread exclusiveOwnerThread;    /**     *      * 设置当前拥有独占访问权的线程。     * null参数表示没有线程拥有访问权。     * 否则，此方法不会强制任何同步或易失性字段访问。     * @param thread 持有者线程     */    protected final void setExclusiveOwnerThread(Thread thread) {
           exclusiveOwnerThread = thread;    }    /**     * Returns the thread last set by {@code setExclusiveOwnerThread},     * or {@code null} if never set.  This method does not otherwise     * impose any synchronization or {@code volatile} field accesses.     * @return the owner thread     */    protected final Thread getExclusiveOwnerThread() {
           return exclusiveOwnerThread;    }}

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