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Fix WaitChannel_Wake to do nothing if there's no threads to wake up.

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This commit is contained in:
Ali Mashtizadeh 2023-09-02 18:41:20 -04:00
parent d3349d9eaa
commit 72341c3c8b
1 changed files with 5 additions and 3 deletions
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8
sys/kern/waitchannel.c
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@ -92,9 +92,11 @@ WaitChannel_Wake(WaitChannel *wchan)
Spinlock_Lock(&wchan->lock); Spinlock_Lock(&wchan->lock);
thr = TAILQ_FIRST(&wchan->chanQueue); thr = TAILQ_FIRST(&wchan->chanQueue);
TAILQ_REMOVE(&wchan->chanQueue, thr, chanQueue); if (thr != NULL) {
Sched_SetRunnable(thr); TAILQ_REMOVE(&wchan->chanQueue, thr, chanQueue);
Thread_Release(thr); Sched_SetRunnable(thr);
Thread_Release(thr);
}
Spinlock_Unlock(&wchan->lock); Spinlock_Unlock(&wchan->lock);
} }