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bc9d9844d5
Calculate if the fd or task should be locked once, before locking, and reuse the calculation when determing when to unlock. Fixes a race condition added in 87d54a9a for fds, and b20aa9ee for tasks, released in 1.9-dev4. When one thread modifies thread_mask to be a single thread for a task or fd while a second thread has locked or is waiting on a lock for that task or fd, the second thread will not unlock it. For FDs, this is observable when a listener is polled by multiple threads, and is closed while those threads have events pending. For tasks, this seems possible, where task_set_affinity is called, but I did not observe it. This must be backported to 1.9.