NSSound thread-safety?

[Jens Alfke]

Speaking of AppKit on background threads … I've been using a background thread to load and play NSSounds, because the +soundNamed: and -play methods often block for significant amounts of time (half a second or more), which was stalling other time-critical actions.

The crash looks like:

Thread 6 Crashed:

3   ...ple.CoreServices.CarbonCore      0x914b3fc8 LoadComponent + 248
4   ...ple.CoreServices.CarbonCore      0x914b3d3c OpenAComponent + 256
5   ...ple.CoreServices.CarbonCore      0x914b3c24 OpenComponent + 16
6   com.apple.AppKit                    0x90f143a8 _initializeCA + 796

12  com.apple.Foundation                0x95b5fdec __NSThread__main__ + 1004
13  libSystem.B.dylib                   0x95e39658 _pthread_start + 316



- (void) _bg_playSoundNamed: (NSString*)name
{
    NSAutoreleasePool *pool = [NSAutoreleasePool new];
        NSSound *sound = [NSSound soundNamed: name];
        if(sound) {
            sound.volume = _volume;
            [sound play];
        } else
             Warn(@"Couldn't load sound named '%@'",name);
    [pool drain];
}

—Jens

This has mostly been working fine, but now I'm occasionally getting crashes. Is NSSound thread-safe? Now that I look, I can't find any documentation; the Cocoa thread safety docs don't refer to NSSound at all. 0 com.apple.CoreFoundation 0x9486f1ac CFBundleGetFunctionPointerForName + 32 1 ...ple.CoreServices.CarbonCore 0x9151b2b4 _cf_lookupLibraryEntry(rtFile*, short, RegisteredComponent*) + 244 2 ...ple.CoreServices.CarbonCore 0x9151b2b4 _cf_lookupLibraryEntry(rtFile*, short, RegisteredComponent*) + 244 7 com.apple.AppKit 0x90f13f90 -[NSSound _postInitialization] + 352 8 com.apple.AppKit 0x90f13d50 -[NSSound initWithContentsOfURL:byReference:] + 256 9 com.apple.AppKit 0x91226070 +[NSSound _searchForSoundNamed:] + 512 10 com.apple.AppKit 0x9122618c +[NSSound soundNamed:] + 212 11 com.mooseyard.Cloudy 0x00003b54 -[MyClass _bg_playSoundNamed:] + 356 All I'm doing is using a -performSelectorOnBackgroundThread: to call the following:

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