When my NSDocument subclass has its printDocument: method called, Lion hangs indefinitely. Snow Leopard works fine.
The top of my stack looks like this:
#0 0x00007fff905676b6 in semaphore_wait_trap ()
#1 0x00007fff85ddb08e in _dispatch_semaphore_wait_slow ()
#2 0x00007fff881b2616 in -[NSDocument performActivityWithSynchronousWaiting:usingBlock:] ()
#3 0x00007fff881a2518 in -[NSDocument runModalPrintOperation:delegate:didRunSelector:contextInfo:] ()
#4 0x000000010009e544 in -[GCOrteliusDocument runModalPrintOperation:delegate:didRunSelector:contextInfo:] at /Users/grahamcox/Projects/Artboard/Artboard/Source/Code/GCOrteliusDocument.m:1476
#5 0x00000001002f5b9f in -[DKDrawingDocument printShowingPrintPanel:] at /Users/grahamcox/Projects/DrawKit/DrawKit/../Source/Code/DKDrawingDocument.m:923
#6 0x00007fff881a1a52 in __-[NSDocument printDocumentWithSettings:showPrintPanel:delegate:didPrintSelector:contextInfo:]_block_invoke_2 ()
#7 0x00007fff881a95e0 in -[NSDocument _commitEditingThenContinue:] ()
#8 0x00007fff881a52ab in -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] ()
#9 0x00007fff881a18bf in __-[NSDocument printDocumentWithSettings:showPrintPanel:delegate:didPrintSelector:contextInfo:]_block_invoke_1 ()
#10 0x00007fff881b2670 in -[NSDocument performActivityWithSynchronousWaiting:usingBlock:] ()
#11 0x00007fff881a17d1 in -[NSDocument printDocumentWithSettings:showPrintPanel:delegate:didPrintSelector:contextInfo:] ()
#12 0x00007fff881a1763 in -[NSDocument printDocument:] ()
So it's waiting on some lock, but it never gets it. This is on the main thread, therefore my app just grinds to a halt and has to be force quit.
I'm at a loss as to what to do - it doesn't seem to be my bug.
--Graham
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