I have a memory leak (an object is never getting dealloc'd) that I have been
debugging / troubleshooting for many, many hours. I have narrowed it down to a
weak referenced delegate object that is being indirectly accessed through an
audio render callback. The code is doing something like this:
static OSStatus renderCallback(__unsafe_unretained id channel,
__unsafe_unretained AEAudioController
*audioController,
const AudioTimeStamp *timeStamp,
UInt32 frames,
AudioBufferList *audio) {
MyClass *myClass = (MyClass *)channel;
for (int i = 0; i < frames; i++) {
[myClass prepareAudio]; // somehow this call causes a strong
reference on the delegate object?
((int16_t *)audio->mBuffers[0].mData)[i] =
myClass->_buffer[myClass->_index];
}
return noErr;
}
@interface MyClass ()
@property (nonatomic, weak) id<MyClassDelegate> delegate;
@end
@implementation MyClass
-(void)prepareAudio {
// stuff
if ([self isDone]) {
[self.delegate didFinish];
}
// more stuff
}
@end
If I pass nil in for the delegate, then the object using this class properly
deallocates... And if I remove the render callback and call prepareAudio in
the main thread, the object using this class properly deallocates. So from
what I can tell it's definitely coming from the audio thread accessing the weak
delegate, and this is somehow turning into a strong reference-- I just don't
understand why that is happening.
I tried doing:
for (int i = 0; i < frames; i++) {
__weak MyClass *weakMyClass = myClass;
[weakMyClass prepareAudio];
((int16_t *)audio->mBuffers[0].mData)[i] =
myClass->_buffer[myClass->_index];
}
But that made no difference...
The other thing that's really weird is, since passing in nil as a delegate
makes the memory leak go away, I thought I could just do:
-(void)prepareAudio {
// stuff
if ([self isDone]) {
[self.delegate didFinish];
self.delegate = nil;
}
// more stuff
}
But that doesn't work either! The main object still never deallocates..
Can anyone tell me how in the world this weak reference is becoming strong?
Patrick J. Collins
http://collinatorstudios.com
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