pifuant commented on issue #238: [ISSUE #237] CLH spinlock URL: https://github.com/apache/rocketmq/pull/238#issuecomment-390714651 @iamzhoug37 Because the compareAndSet call forces other processors to discard their own cached copies of the lock, so every spinning thread encounters a cache miss almost every time, and must fetch the new, but unchanged value. Using CLH queue, a release thread just wakes up next spinning thread than all.
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