Thread question

[Banlu Kemiyatorn]

Hi,
I need help on NSThread, Here,s the code

@implementation MyObj
- (void) launch
{
       // id p = [NSAutoreleasePool new];
        NSLog(@"x");
        //[p release];
}
@end

int main (int argc, const char * argv[]) {
        id p = [NSAutoreleasePool new];

        id obj = [MyObj new];
        [NSThread detachNewThreadSelector:@selector(launch)
toTarget:obj withObject:nil];
        [NSThread detachNewThreadSelector:@selector(launch)
toTarget:obj withObject:nil];
   /* some sleep */


I got
  Uncaught exception NSLockException, reason: failed to unlock mutex
But if I NSLock NSLog, it will log 2 "x"
Does this mean NSLog isn't thread-safe? or what do I miss?

Thanks,
Banlu

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