NSNotification and NSView problem???

Don't use NSNotificationCenter for communicating between threads. Notifications are always received on the same thread in which they were sent, in other words, it's probably not doing at all what you want it to. NSNotificationCenter is more geared towards implementing the Observer design pattern, not threading.

from http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSNotificationCenter_Class/Reference/Reference.html

You could use Grand Central Dispatch to schedule a block for execution on thread A's dispatch queue instead. Grand Central Dispatch will allow you to do this from thread B.

Code:

/* In thread B */
dispatch_async(dispatch_get_main_queue(), ^{
  /*   ... code you want to execute on thread A ... */
});

Alternatively you can use NSObject's method to perform a selector on the main thread.

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSObject_Class/Reference/Reference.html

Code:

- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait modes:(NSArray *)array

Both methods are going to ultimately work by queuing some message on the application's run loop on the main thread for execution at a later time.

There might be other methods for accomplishing this as well. Anybody?