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5ad02062d9
Fix memory barrier issues on releasing mutexes. We must have a full memory barrier between releasing a mutex lock and reading its waiters. This prevents us from missing to release waiters due to reading the number of waiters speculatively before releasing the lock. If threads try and wait between us reading the waiters count and releasing the lock, those threads might stall indefinitely. Also, we must use proper ACQUIRE/RELEASE semantics for atomic operations, not ACQUIRE/ACQUIRE. |
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