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thread-posix: optimize qemu_sem_timedwait with zero timeout 

In this case there is no need to call pthread_cond_timedwait; the
function is just a trywait and waiting on the condition variable would
always time out.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-02-21 12:46:32 +01:00
parent a0d45db854
commit 8ab3026489
1 changed files with 6 additions and 2 deletions
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8
util/qemu-thread-posix.c
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@ -284,8 +284,12 @@ int qemu_sem_timedwait(QemuSemaphore *sem, int ms)
compute_abs_deadline(&ts, ms);
qemu_mutex_lock(&sem->mutex);
while (sem->count == 0) {
rc = qemu_cond_timedwait_ts(&sem->cond, &sem->mutex, &ts,
__FILE__, __LINE__);
if (ms == 0) {
rc = false;
} else {
rc = qemu_cond_timedwait_ts(&sem->cond, &sem->mutex, &ts,
__FILE__, __LINE__);
}
if (!rc) { /* timeout */
break;
}