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                自旋鎖(spinlock)和互斥鎖(mutex) 對于鎖的兩點認識: 1.?鎖操作本身很快,不應把注意力放在加解鎖操作(包括那種濫用原子操作搞無鎖隊列之類的行為其實沒有大的必要)。關鍵是不要長時間持有鎖。 2.?讀寫鎖的特點是,并發讀,不互斥,但是讀寫互斥,寫互斥。所以讀寫鎖的應用場景是,對資源的寫頻率不高,但是讀頻率很高的場景
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