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Snailclimb merged 1 commit into from
Nov 26, 2019
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fix-569 #570

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2 changes: 1 addition & 1 deletion docs/java/Multithread/AQS.md
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Expand Up @@ -78,7 +78,7 @@ protected final boolean compareAndSetState(int expect, int update) {

- **Exclusive**（独占）：只有一个线程能执行，如ReentrantLock。又可分为公平锁和非公平锁：
- 公平锁：按照线程在队列中的排队顺序，先到者先拿到锁
- 非公平锁：当线程要获取锁时，无视队列顺序直接去抢锁，谁抢到就是谁的
- 非公平锁：当线程要获取锁时，先通过 CAS 操作和队列头的线程去抢锁，如果没抢到，当前线程再加入到队列中等待唤醒。
- **Share**（共享）：多个线程可同时执行，如Semaphore/CountDownLatch。Semaphore、CountDownLatCh、 CyclicBarrier、ReadWriteLock 我们都会在后面讲到。

ReentrantReadWriteLock 可以看成是组合式，因为ReentrantReadWriteLock也就是读写锁允许多个线程同时对某一资源进行读。
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