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LibC: Fix sem_{,timed}wait

This commit is contained in:
Bananymous 2026-04-02 15:43:34 +03:00
parent c1b8f5e475
commit 876fbe3d7c
1 changed files with 5 additions and 1 deletions
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6
userspace/libraries/LibC/semaphore.cpp
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@ -49,8 +49,12 @@ int sem_timedwait(sem_t* __restrict sem, const struct timespec* __restrict absti
for (;;) for (;;)
{ {
uint32_t expected = BAN::atomic_load(sem->value); uint32_t expected = BAN::atomic_load(sem->value);
if (expected > 0 && BAN::atomic_compare_exchange(sem->value, expected, expected - 1)) if (expected > 0)
{
if (!BAN::atomic_compare_exchange(sem->value, expected, expected - 1))
continue;
return 0; return 0;
}
const int op = FUTEX_WAIT | (sem->shared ? 0 : FUTEX_PRIVATE) | FUTEX_REALTIME; const int op = FUTEX_WAIT | (sem->shared ? 0 : FUTEX_PRIVATE) | FUTEX_REALTIME;
if (futex(op, &sem->value, expected, abstime) == -1 && (errno == EINTR || errno == ETIMEDOUT)) if (futex(op, &sem->value, expected, abstime) == -1 && (errno == EINTR || errno == ETIMEDOUT))