gistfile1.mm

// In an NSOperation subclass...

- (void)main {
    @try
    {
        // Do some stuff that could be buggy...        
    }
    @catch(NSException* ex)
    {
        // For debugging purposes, re-raise in the main thread any exceptions that are thrown in this thread.
        [ex performSelectorOnMainThread:@selector(raise) withObject:nil waitUntilDone:YES];
    }
}