As far as I'm aware, "not thread safe" means "it's not safe to do this
on multiple threads", not "it's not safe to do this on a background
thread".
Is there any chance you're trying to play more than one sound at the
same time? You don't seem to have any locking there to ensure this.
And: are you doing anything with NSSound on the main thread?
Cheers,
Brett
On 17/06/2008, at 10:07 AM, Jens Alfke wrote:
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.
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.
The crash looks like:
Thread 6 Crashed:
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
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
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
12 com.apple.Foundation 0x95b5fdec __NSThread__main__ +
1004
13 libSystem.B.dylib 0x95e39658 _pthread_start + 316
All I'm doing is using a -performSelectorOnBackgroundThread: to call
the following:
- (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_______________________________________________
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