On Dec 4, 2011, at 5:49 PM, Jerry Krinock wrote:
> At one point, running in Mac OS 10.7, one of my invocations gets invoked, and
> …
>
> #0 0x913761fa in NSBeep
> #1 0x9b6f0e1d in __invoking___
> #2 0x9b6f0d59 in -[NSInvocation invoke]
> #3 0x976458ea in __NSFireDelayedPerform
> #4 0x9b6b0996 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
> …
>
> Everything works perfectly except that the stupid beep is annoying.
>
> The invocation targets NSApplication with selector
> -beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo:. I
> looked at it in gdb using "Mac OS X Debugging Magic". The target, selector,
> and arguments all look fine.
>
> The sheet appears before the beep. The method -[NSInvocation invoke] shows
> 92 lines of assembly code. It looks like, indeed, the actual invocation is
> done first, and then at line 41 it calls this __invoking__ thing, which is 48
> lines of assembly code, and for some reason at line 15 it calls NSBeep().
>
> Does anyone have any idea why -[NSInvocation invoke] might call NSBeep()?
NSBeep() is being called by -beginSheet:modalForWindow:... . Compiler
optimization ("tail-call optimization") means that the -beginSheet:... frame is
absent from the stack trace.
-beginSheet:... calls NSBeep() in some error case. I don't understand the code
myself, but I'd guess that it's complaining because there's already a sheet
open on that window. Perhaps you're calling -beginSheet: twice, and the first
call works and the second call just beeps.
You should file a bug report asking for -beginSheet:... to log a real error
message or throw an exception instead of beeping.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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