Basic Linux and Windows Thread Prioritisation for worker threads #842
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This PR implements basic thread prioritisation on Linux and Windows and fixes a bug in
dispatch_get_global_queue
where the wrong QOS type is used.Note that this only sets the initial thread priority by translating QoS to thread priorities. Relative priorities are ignored for now. Later QoS overrides and other priority adjustments have no effect.
See the comments for implementation details.
Result on Windows
hugo@YellowBox MSYS /tmp # ./a.exe priority 0 descr com.apple.root.default-qos priority -1 descr com.apple.root.utility-qos priority -4 descr com.apple.root.background-qos priority 1 descr com.apple.root.user-initiated-qos
Result on Linux