dispatch_sync on main queue hangs in unit test

Question

I was having some trouble unit testing some grand central dispatch code with the built in Xcode unit testing framework, SenTestingKit. I managed to boil my problem done to t

Answer 1

If you are on the main queue and synchronously wait for the main queue to be available you will indeed wait a long time. You should test to make sure you are not already on the main thread.