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Co-authored-by: Amanieu d'Antras <amanieu@gmail.com>
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the8472 2021-08-16 00:01:41 +02:00 committed by GitHub
parent a98a30976b
commit 7256a6a86d
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1 changed files with 2 additions and 2 deletions
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4
library/std/src/time/monotonic.rs
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@ -34,14 +34,14 @@ pub mod inner {
let packed = (secs << 32) | nanos;
let old = MONO.load(Relaxed);
if packed == UNINITIALIZED || packed.wrapping_sub(old) < u64::MAX / 2 {
if old == UNINITIALIZED || packed.wrapping_sub(old) < u64::MAX / 2 {
MONO.store(packed, Relaxed);
raw
} else {
// Backslide occurred. We reconstruct monotonized time by assuming the clock will never
// backslide more than 2`32 seconds which means we can reuse the upper 32bits from
// the seconds.
let secs = (secs & 0xffff_ffff << 32) | old >> 32;
let secs = (secs & 0xffff_ffff_0000_0000) | old >> 32;
let nanos = old as u32;
ZERO.checked_add_duration(&Duration::new(secs, nanos)).unwrap()
}