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说说自旋锁与互斥锁的区别，以及自旋锁适用的场景 #90

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tbfungeek opened this issue Feb 13, 2020 · 0 comments
Open

说说自旋锁与互斥锁的区别，以及自旋锁适用的场景 #90

tbfungeek opened this issue Feb 13, 2020 · 0 comments

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@tbfungeek
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二者区别在于在争夺锁的过程，没获得锁的那一方的行为，互斥锁会阻塞线程睡眠等待，而自旋锁会不断尝试，直到获得锁为止。自旋锁在未获得锁的情况下会占用着CPU一直运行，在长时间未能获得锁的情况会降低CPU的效率，并且自旋锁有优先级反转的问题存在，所以自旋锁适用于内核可抢占式的系统，对于单CPU且不可抢占式的内核下仅适合于锁使用者保持锁时间比较短的情况。
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