site_archiver@lists.apple.com Delivered-To: cocoa-dev@lists.apple.com I execute the following code in a subclass of NSOperationQueue: if (error) { NSLog(@"Cancelling all operations due to error") ; [self cancelAllOperations] ; } NSLog(@"#1 Remaining operations in %p:\n%@", self, [self operations]) ; NSLog(@"#2 Remaining operations in %p:\n%@", self, [self operations]) ; The console result: 2010-03-31 14:06:11.581 TestApp[10342:7d0f] Cancelling all operations due to error 2010-03-31 14:06:11.583 TestApp[10342:7d0f] #1 Remaining operations in 0x1a38e6a0: ( <NSInvocationOperation: 0x1a38d740>, SSYOperation 0x1a38d7e0 selector=saveDocument, <NSInvocationOperation: 0x1a386510>, SSYOperation 0x1a3a5510 selector=terminateWork, <NSInvocationOperation: 0x1a385f20> ) 2010-03-31 14:06:11.584 TestApp[10342:7d0f] #2 Remaining operations in 0x1a38e6a0: ( <NSInvocationOperation: 0x1a38d740> ) So you see in NSLog #1 there are 5 operations in the queue. This is expected, because although the documentation for -cancelAllOperations is a little vague, it does not say that it *removes* any operations from the queue. But what happens in NSLog #2? All operations are gone except the first one. All of a sudden! Big thanks to anyone who can offer any clues on this. Jerry Krinock P.S. The above code is executing on a secondary thread. Is that a possible issue? NSOperationQueue is not listed as a thread-safe class in the Threading Programming Guide. But in the class documentation it says "It is safe to use a single NSOperationQueue object from multiple threads without creating additional locks to synchronize access to that object." I tried running the above code with performSelectorOnMainThread wrappers, but got a deadlock I can't explain either. (Sample shows mach_msg_trap.) _______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/site_archiver%40lists.apple... This email sent to site_archiver@lists.apple.com