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Tail
抢占锁
Head
Thread A
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AbstractQueuedSynchronizer compareAndSetState方法 stateOffset 0-->1 exclusiveOwnerThread = Thread B
Thread B
lock 临界区代码块unLock
Thread ...
唤醒
释放锁
Node
自旋
Thread C
AbstractQueuedSynchronizer compareAndSetState方法 stateOffset 1-->0 exclusiveOwnerThread = null
waitStatusOffset=0
没有抢占到锁
