JavaQ



JavaQ

AbstractQueuedSynchronizer简称AQS,它是java.util.concurrent包下CountDownLatch/FutureTask/ReentrantLock/RenntrantReadWriteLock/Semaphore实现的基础,所以深入理解AQS非常有必要。

AQS通过内部实现的FIFO同步等待队列来完成资源获取线程的等待工作,如果当前线程获取资源失败,AQS则会将当前线程以及等待状态等信息构造成一个Node结构的节点,并将其加入等待队列中,同时会阻塞当前线程;当其它获取到资源的线程释放持有的资源时,则会把等待队列节点中的线程唤醒,使其再次尝试获取对应资源。


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