Every Thread has its own RunLoop, how DispatchQueue interact with them? Is DispatchQueue using RunLoop to dispatch task to Thread or do it by another way?

Using Swift's new async/await functionality, I want to emulate the scheduling behavior of a serial queue (similar to how one might use a DispatchQueue or OperationQueue in the past). Simplifying my us...

Sometimes I need to do synchronous return. In dispatch_sync it's just: __block int foo dispatch_sync({ foo = 3 }); return foo; I am not sure how that translates to NSOperationQueue. I have checked ...