Benjamin Encz

@benjaminencz wonderful post! I have a concern with the suggestion though - what if the lib relies on thread-specific data, like SQLite?

@mattie Good point. If you know that lib relies on thread semantics you should check threads. If you know it relies on GCD check queues.

@mattie But if lib claims "only use me from the main thread", checking for main queue will check both boxes in case lib relies on GCD.

@benjaminencz oh it will? How is that possible with a dispatch_sync?

@mattie I meant that if you check for main queue with `dispatch_get_specific` you've also checked for main thread.

@mattie Since main queue will ever only execute on main thread.

@benjaminencz dispatch_async will always be on the main thread, did you mean that?

@benjaminencz your solution can deadlock under this case Main Thread -> Main Queue -> other_queue -> your code ->: sync call

@dtorres Thanks! I’m aware of that. Really wouldn’t dispatch_sync from main queue in actual code. Needed some example.

@benjaminencz you may not, the stackoverflowers and other inexperienced readers definitely will. Put a big ass warning in there