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                #### 6.什么是AQS鎖? AQS是一個抽象類,可以用來構造鎖和同步類,如ReentrantLock,Semaphore,CountDownLatch,CyclicBarrier。 AQS 核心思想是,如果被請求的共享資源空閑,則將當前請求資源的線程設置為有效的工作線程,并且將共享資源設置為鎖定狀態。如果被請求的共享資源被占用,那么就需要一套線程阻塞等待以及被喚醒時鎖分配的機制,這個機制是將暫時獲取不到鎖的線程加入到同步阻塞隊列中。這個隊列是用雙向鏈表實現的。
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