Trying to Create a Custom NSOperation with Dependencies in Objective-C but Getting Deadlock
I'm refactoring my project and I'm refactoring my project and I'm stuck trying to I'm following best practices but I'm sure I'm missing something obvious here, but I'm sure I'm missing something obvious here, but I'm working on an application that requires a series of network requests to be performed in sequence, and I'm trying to implement this using `NSOperation` and `NSOperationQueue`....... However, I'm running into a question where the app experiences a deadlock when executing operations that have dependencies. Here's a simplified version of my code: ```objective-c @interface MyOperation : NSOperation @property (nonatomic, strong) NSURL *url; @end @implementation MyOperation - (void)main { if (self.isCancelled) return; // Simulating a network request NSData *data = [NSData dataWithContentsOfURL:self.url]; NSLog(@"Fetched data: %@", data); } @end NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init]; MyOperation *firstOperation = [MyOperation new]; firstOperation.url = [NSURL URLWithString:@"https://example.com/first"]; MyOperation *secondOperation = [MyOperation new]; secondOperation.url = [NSURL URLWithString:@"https://example.com/second"]; [secondOperation addDependency:firstOperation]; [operationQueue addOperation:firstOperation]; [operationQueue addOperation:secondOperation]; ``` When I run this, both operations get queued up, but the second operation never executes. The console shows no errors or logs from `secondOperation`. I've tried using `NSBlockOperation` as well, but I experience the same scenario. I suspect it might have something to do with the queue configuration or the way I'm adding dependencies. I've checked that I'm not blocking the main thread anywhere else in the app. Any suggestions to resolve this deadlock scenario? I'm using Xcode 14 with iOS 16.0 SDK. This is part of a larger application I'm building. Am I missing something obvious? For context: I'm using Objective-C on Ubuntu. How would you solve this? Is there a better approach? The project is a service built with Objective-C. I appreciate any insights! Is this even possible? My team is using Objective-C for this service. I recently upgraded to Objective-C 3.11. What are your experiences with this?