Robust futexes - a new approach [LWN.net]One of the many features added during the 2.5 development series was the "futex" - a sort of fast, user-space mutual exclusion primitive. In the non-contended case, futexes can be obtained and released with no kernel involvement at all, making them quite fast. When contention does happen (one process tries to obtain a futex currently owned by another), the kernel is called in to queue any waiting
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