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std: ensure that the deadline has passed in sleep_until #151494

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Merged
rust-bors merged 1 commit into from
Jan 23, 2026
Merged

std: ensure that the deadline has passed in sleep_until #151494

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13 changes: 10 additions & 3 deletions library/std/src/sys/thread/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -139,9 +139,16 @@ cfg_select! {
pub fn sleep_until(deadline: crate::time::Instant) {
use crate::time::Instant;

let now = Instant::now();

if let Some(delay) = deadline.checked_duration_since(now) {
// The clock source used for `sleep` might not be the same used for `Instant`.
// Since this function *must not* return before the deadline, we recheck the
// time after every call to `sleep`. See #149935 for an example of this
// occurring on older Windows systems.
while let Some(delay) = deadline.checked_duration_since(Instant::now()) {
// Sleep for the estimated time remaining until the deadline.
//
// If your system has a better way of estimating the delay time or
// provides a way to sleep until an absolute time, specialize this
// function for your system.
sleep(delay);
}
}
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