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Fixed potential deadlock, if a delegate decided to dealloc the queue as a result of its prompting.

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This commit is contained in:
Thomas Harte 2017-03-11 17:44:02 -05:00
parent bce5abd33b
commit 38ce4dc56c
1 changed files with 12 additions and 5 deletions
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17
OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
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@ -23,10 +23,11 @@ static NSLock *CSAudioQueueDeallocLock;
#pragma mark - AudioQueue callbacks
- (void)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer
/*!
@returns @c YES if the queue is running dry; @c NO otherwise.
*/
- (BOOL)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer
{
[self.delegate audioQueueIsRunningDry:self];
[_storedBuffersLock lock];
for(int c = 0; c < NumberOfStoredAudioQueueBuffer; c++)
{
@ -35,11 +36,12 @@ static NSLock *CSAudioQueueDeallocLock;
if(_storedBuffers[c]) AudioQueueFreeBuffer(_audioQueue, _storedBuffers[c]);
_storedBuffers[c] = buffer;
[_storedBuffersLock unlock];
return;
return YES;
}
}
[_storedBuffersLock unlock];
AudioQueueFreeBuffer(_audioQueue, buffer);
return YES;
}
static void audioOutputCallback(
@ -47,11 +49,16 @@ static void audioOutputCallback(
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer)
{
// Pull the delegate call for audio queue running dry outside of the locked region, to allow non-deadlocking
// lifecycle -dealloc events to result from it.
CSAudioQueue *queue = (__bridge CSAudioQueue *)inUserData;
BOOL isRunningDry = NO;
if([CSAudioQueueDeallocLock tryLock])
{
[(__bridge CSAudioQueue *)inUserData audioQueue:inAQ didCallbackWithBuffer:inBuffer];
isRunningDry = [queue audioQueue:inAQ didCallbackWithBuffer:inBuffer];
[CSAudioQueueDeallocLock unlock];
}
if(isRunningDry) [queue.delegate audioQueueIsRunningDry:queue];
}
#pragma mark - Standard object lifecycle