Why are POSIX mutexes considered heavier or slower than futexes? Where is the overhead coming from in the pthread mutex type? I've heard that pthread mutexes are based on futexes, and when uncontested, do not make any calls into the kernel. It seems then that a pthread mutex is merely a "wrapper" around a futex.Why are POSIX mutexes considered heavier or slo
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为什么pthread互斥对象被认为比互斥对象“慢”?
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