Utility: add a Windows path to the synchronisation support #603
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Use a `SRWLOCK` on Windows to support locking. Slim Reader-Writer locks are lightweight mutexes that closely resemble `pthread_mutex_t` in functionality. While possible to use `WaitOnAddress` to implement `os_unfair_lock`, that would be more complex and a slightly heavier mutex as a starting point seems reasonable. If it turns out that the performance really requires an even lighter weight locking primitive, we can refine this to `WaitOnAddress` subsequently.
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@swift-ci please test |
daniel-grumberg
approved these changes
May 31, 2023
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Use a
SRWLOCKon Windows to support locking. Slim Reader-Writer locks are lightweight mutexes that closely resemblepthread_mutex_tin functionality. While possible to useWaitOnAddressto implementos_unfair_lock, that would be more complex and a slightly heavier mutex as a starting point seems reasonable. If it turns out that the performance really requires an even lighter weight locking primitive, we can refine this toWaitOnAddresssubsequently.