Use os_unfair_lock on Darwin when available.#942
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This PR refactors the `Locked` type to be generic over the type of lock it uses, allowing us to adopt `os_unfair_lock` in most places, but also allowing us to use other lock types as needed (i.e. `pthread_mutex_t` in WaitFor.swift if libdispatch is unavailable.) Under `-O`, locking and unlocking is fully inlined, while initialization (which is relatively rare) is partially, but not completely, inlined.
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stmontgomery
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Feb 5, 2025
stmontgomery
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Feb 5, 2025
Co-authored-by: Stuart Montgomery <smontgomery@apple.com>
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stmontgomery
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Feb 5, 2025
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stmontgomery
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Feb 6, 2025
stmontgomery
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Feb 6, 2025
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This PR refactors the
Lockedtype to be generic over the type of lock it uses, allowing us to adoptos_unfair_lockin most places, but also allowing us to use other lock types as needed (i.e.pthread_mutex_tin WaitFor.swift if libdispatch is unavailable.)Under
-O, locking and unlocking is fully inlined, while initialization (which is relatively rare) is partially, but not completely, inlined.Checklist: