> * Now, how does queue A wait for the callback? It seems to be impossible: the > only way for code running on queue A to receive the callback is to return > back to the queue dispatcher, so if it tries to wait it simply blocks the > queue, causing a deadlock.
You could use some other signaling mechanism -- a dispatch_semaphore_t or NSConditionLock, for example. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
