Bug 14665 – thread priority does nothing on linux

pthread_setschedprio does nothing for non-realtime threads on linux, and setting it to non-zero with a non-realtime scheduling policy is undefined behavior[1]. I believe the correct thing to do is use nice levels(as it is per-thread, not per-process in linux[2]) for thread priority[3] [1] - sched(7) - For threads scheduled under one of the normal scheduling policies (SCHED_OTHER, SCHED_IDLE, SCHED_BATCH), sched_priority is not used in scheduling decisions (it must be specified as 0). [2] - "The scheduling policy and parameters are in fact per-thread attributes on Linux." "The LinuxThreads implementation deviates from the POSIX.1 specification in a number of ways, including the following ... Threads do not share a common nice value." - pthreads(7) [3] - The dynamic priority is based on the nice value (set by nice(2), setpriority(2), or sched_setattr(2)) and increased for each time quantum the thread is ready to run, but denied to run by the scheduler. This ensures fair progress among all SCHED_OTHER threads.

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