NSNotification and Multithreading

I'm trying to get the notification NSTaskDidTerminateNotification in my multithreaded app but I can't get it working. It does seem to work when I tested it on a single threaded app. In init I have [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(taskDidEnd:) name: NSTaskDidTerminateNotification object: myTask]; and I'm quite sure that it gets called because other objects (like myTask) are being initiated there. And the taskDidEnd: method is defined as

- (void)taskDidEnd: (NSNotification *)aNotification
{
   开发者_开发百科  NSLog(@"Task succeeded.");
}

And in dealloc the observer gets removed.

This all happens in an object which is initiated inside a separate thread and I would like to receive that notification inside the same object.

Did you run the run loop on that thread? If not, NSTask won't notice that the task ended (or the task won't have ended yet) and won't post the notification.