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NSUIHeartBeat gets stuck

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NSUIHeartBeat gets stuck

Subject: NSUIHeartBeat gets stuck
From: "Adam R. Maxwell" <email@hidden>
Date: Tue, 06 Jan 2009 00:17:17 -0800

I have an app that starts and stops a spinning progress indicator based on the number of operations in an NSOperationQueue. The spinner is started and stopped only on the main thread, and is set to hide when not spinning.

After canceling all operations in the queue and immediately adding another one, the NSUIHeartBeat thread gets stuck (sample follows), and the spinner stops in the middle of its animation. Thereafter, it refuses to animate, but still hides when explicitly stopped.

There are no exceptions logged, so I'm running out of ideas to debug this. Any suggestions?

thanks,
Adam Maxwell

(apologies if this shows up twice...Mail hung when I sent it the first time and evidently ate my draft message)

Call graph: 1508 Thread_2503 1508 start 1508 NSApplicationMain 1508 -[NSApplication run] 1508 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 1508 _DPSNextEvent 1508 BlockUntilNextEventMatchingListInMode 1508 ReceiveNextEventCommon 1508 RunCurrentEventLoopInMode 1508 CFRunLoopRunSpecific 1508 mach_msg 1508 mach_msg_trap 1508 mach_msg_trap 1508 Thread_2603 1508 start_wqthread 1508 _pthread_wqthread 1508 -[NSOperation start] 1508 -[TLMOperation main] 1508 CFRunLoopRunSpecific 1508 mach_msg 1508 mach_msg_trap 1508 mach_msg_trap 1508 Thread_2703 1508 start_wqthread 1508 __workq_ops 1508 __workq_ops 1508 Thread_2803 1508 thread_start 1508 _pthread_start 1508 fe_fragment_thread 1508 __semwait_signal 1508 __semwait_signal 1508 Thread_2903 1508 thread_start 1508 _pthread_start 1508 __NSThread__main__ 1508 kevent 1508 kevent 1508 Thread_2a03 1508 thread_start 1508 _pthread_start 1508 __NSThread__main__ 1508 -[NSUIHeartBeat _heartBeatThread:] 1508 -[NSWindow _copyAcquiredViewHierarchyLock] 1508 -[NSViewHierarchyLock lockForReadingWithExceptionHandler:] 1508 __semwait_signal 1508 __semwait_signal 1508 Thread_2b03 1508 thread_start 1508 _pthread_start 1508 glvmDoWork 1508 __semwait_signal 1508 __semwait_signal 1508 Thread_2c03 1508 thread_start 1508 _pthread_start 1508 _backgroundActivity 1508 read 1508 read 1508 Thread_2d03 1508 thread_start 1508 _pthread_start 1508 _backgroundActivity 1508 read 1508 read

Total number in stack (recursive counted multiple, when >=5):
        6       _pthread_start
        6       thread_start

Sort by top of stack, same collapsed (when >= 5):
        __semwait_signal        4524
        mach_msg_trap        3016
        read        3016
        __workq_ops        1508
        kevent        1508
Sample analysis of process 1033 written to file /dev/stdout

Attachment: smime.p7s
Description: S/MIME cryptographic signature

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