Bug in AUEventListener?
Bug in AUEventListener?
- Subject: Bug in AUEventListener?
- From: Urs Heckmann <email@hidden>
- Date: Sat, 30 Oct 2004 23:11:44 +0200
Hi,
I've worked with AUEventListeners for some weeks, but I finally found
out that they were related to some odd crashes I encountered recently.
What I do is, instead of ParameterListeres and PropertyListeners, I
used AUEventListeners for both. During AUView::CreateUI I installed
them, added the AudioUnitEvents (for 300 Parameters and a couple of
Properties), all worked fine until in ~AUView I removed all events and
disposed off the Listener. All good except...
... both in SynthTest and Logic 7 (and maybe some other hosts) it can
happen that the View gets closed and re-opened immediately. And boom it
goes. In SynthTest this is easily reproduceable when loading a new
aupreset - funnily, SynthTest deletes/constructs the gui during preset
change, which is a good stress test. This is a guaranteed crash (see
SynthTest Crash Log below).
Commenting out the creation of the AUEventListener made it work
perfectly. It also works pretty fine when using the dedicated Listeners
for Parameters/Properties. (Except that, as Bill pointed out, I can't
draw upon Parameter Notification)
My current guess is, that if the AUEventListener is disposed, some
events might still be in the queue, and on re-install *before*
something magical in the RunLoop ditches them some undefined behaviour
occurrs. Dunno.
So, is that only me or is it a bug in the Listener stuff?
Cheers,
;) Urs
Thread 0 Crashed:
#0 0x04040404 in 0x4040404
#1 0x90194848 in __CFRunLoopDoTimer (__CFRunLoopDoTimer + 244)
#2 0x90191ba8 in __CFRunLoopRun (__CFRunLoopRun + 1480)
#3 0x901960bc in CFRunLoopRunSpecific (CFRunLoopRunSpecific + 328)
#4 0x927d5ecc in RunCurrentEventLoopInMode
(RunCurrentEventLoopInMode + 172)
#5 0x927dc5b8 in ReceiveNextEventCommon (ReceiveNextEventCommon +
244)
#6 0x927fe6d0 in BlockUntilNextEventMatchingListInMode
(BlockUntilNextEventMatchingListInMode + 96)
#7 0x92dd2a80 in _DPSNextEvent (_DPSNextEvent + 384)
#8 0x92de93fc in -[NSApplication
nextEventMatchingMask:untilDate:inMode:dequeue:] (-[NSApplication
nextEventMatchingMask:untilDate:inMode:dequeue:] + 116)
#9 0x92dfd730 in -[NSApplication run] (-[NSApplication run] + 540)
#10 0x92eb9a1c in NSApplicationMain (NSApplicationMain + 464)
#11 0x00004bcc in main (main + 40)
#12 0x00004950 in _start (_start + 380)
#13 0x000047d0 in start (start + 48)
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