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coreaudio: Don't crash on shutdown in a race condition.

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Fixed #6159.
(cherry picked from commit 411582c710)
This commit is contained in:
Ryan C. Gordon 2022-09-28 09:22:17 -04:00 committed by Ozkan Sezer
parent 128c34b839
commit d6e939ddb5
1 changed files with 8 additions and 0 deletions
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8
src/audio/coreaudio/SDL_coreaudio.m
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@ -523,8 +523,16 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
{
SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
/* This flag is set before this->mixer_lock is destroyed during
shutdown, so check it before grabbing the mutex, and then check it
again _after_ in case we blocked waiting on the lock. */
if (SDL_AtomicGet(&this->shutdown)) {
return; /* don't do anything, since we don't even want to enqueue this buffer again. */
}
SDL_LockMutex(this->mixer_lock);
/* !!! FIXME: why do we have this->hidden->shutdown when this->shutdown exists? */
if (SDL_AtomicGet(&this->hidden->shutdown)) {
SDL_UnlockMutex(this->mixer_lock);
return; /* don't do anything, since we don't even want to enqueue this buffer again. */