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Windows: Support sub-millisecond sleep #116461
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Windows: Support sub-millisecond sleep
Use `CreateWaitableTimerExW` with `CREATE_WAITABLE_TIMER_HIGH_RESOLUTION`. Does not work before Windows 10, version 1803 so in that case we fallback to using `Sleep`.
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How good is the performance of
CreateWaitableTimerExW
? If it is slow, it might be better to cache the timer in a thread local.There was a problem hiding this comment.
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It's around 2,000 nanoseconds on my machine (minus the time it takes to call
QueryPerformanceCounter
). That is well within noise for waiting on my machine. Granted, other hardware may be able to perform better but I'd rather avoid adding a thread local unless or until someone can show it's worth it.