15ce06c931
std: ensure that the deadline has passed in `sleep_until` The clock source used for `sleep` might not be the same as the one used for `Instant`, so the implementation of `sleep_until` may not assume that the `Instant` has elapsed. This is particularly relevant on Windows, where [`QueryPerformanceCounter`](https://learn.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileapi-queryperformancecounter) is used for `Instant`, but [`SetWaitableTimer`](https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-setwaitabletimer) is (probably[^1]) based on [`QueryUnbiasedInterruptTimePrecise`](https://learn.microsoft.com/en-us/windows/win32/api/realtimeapiset/nf-realtimeapiset-queryunbiasedinterrupttimeprecise). If these clocks drift apart, the `sleep` might return before the deadline has passed. Thus, this PR makes `sleep_until` recheck the current time after waking up and restart the `sleep` if necessary. [^1]: The documentation doesn't specify a clock, but `QueryUnbiasedInterruptTimePrecise` uses the same units and doesn't count time during sleep either, so I'd wager it's what is used for the timer. |
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| Cargo.toml | ||