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自旋与sleep的区别
2022-07-06 17:22:00 【raoxiaoya】
sleep:是通过定时器来实现的,线程会被挂起,让出CPU,时间到了操作系统就会将线程修改为就绪状态,并加入到就绪队列等待被调度。
自旋:一般使用在抢夺锁的时候,抢锁失败了就左一定次数的自旋,自旋操作会调用CPU的PAUSE指令。PAUSE指令什么都不做,但是会消耗CPU时间,因此不会让出CPU。
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