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[Concurrency] Prevent negative sleeps from sleeping forever. #82564

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Merged
merged 1 commit into from
Jul 2, 2025
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[Concurrency] Prevent negative sleeps from sleeping forever. #82564

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10 changes: 7 additions & 3 deletions stdlib/public/Concurrency/DispatchGlobalExecutor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -333,7 +333,9 @@ void swift_dispatchEnqueueWithDeadline(bool global,
}

uint64_t deadline;
if (__builtin_mul_overflow(sec, NSEC_PER_SEC, &deadline)
if (sec < 0 || sec == 0 && nsec < 0)
deadline = 0;
else if (__builtin_mul_overflow(sec, NSEC_PER_SEC, &deadline)
|| __builtin_add_overflow(nsec, deadline, &deadline)) {
deadline = UINT64_MAX;
}
Expand All @@ -342,8 +344,10 @@ void swift_dispatchEnqueueWithDeadline(bool global,

if (tnsec != -1) {
uint64_t leeway;
if (__builtin_mul_overflow(tsec, NSEC_PER_SEC, &leeway)
|| __builtin_add_overflow(tnsec, leeway, &leeway)) {
if (tsec < 0 || tsec == 0 && tnsec < 0)
leeway = 0;
else if (__builtin_mul_overflow(tsec, NSEC_PER_SEC, &leeway)
|| __builtin_add_overflow(tnsec, leeway, &leeway)) {
leeway = UINT64_MAX;
}

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