Mike Ash dd6c235a2d [Runtime] Use os_unfair_lock for Mutex and StaticMutex on Darwin. ...

os_unfair_lock is much smaller than pthread_mutex_t (4 bytes versus 64) and a bit faster.

However, it doesn't support condition variables. Most of our uses of Mutex don't use condition variables, but a few do. Introduce ConditionMutex and StaticConditionMutex, which allow condition variables and continue to use pthread_mutex_t.

On all other platforms, we continue to use the same backing mutex type for both Mutex and ConditionMutex.

rdar://problem/45412121

2020-11-06 13:05:37 -05:00

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