43c2e845ab
Heavy-weight locking isn't required to pass the work queue pointer between threads and simple atomic acquire/release semantics can be used instead. This is especially important as pthread_mutex_lock() isn't fair. We've observed substantial variation in runtime because of the the unfairness of these locks which complety goes away with this implementation. The locks themselves are left to provide a portable way for idling threads to sleep/wakeup after many unsuccessful iterations waiting. |
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