I am facing an issue in using semaphores on iOS. I am implementing a feature to execute a series of async methods sequentially, one after another in order. let semaphore = DispatchSemaphore(value: ...

class SomeViewController: UIViewController { let semaphore = DispatchSemaphore(value: 1) deinit { semaphore.signal() // just in case? } func someLongAsyncTask() { semaphore.wait() ... sem...

Apparently I can only use DispatchSemaphore if I deal with different queues. But what if I want to run async code on the same queue (in this case the main queue). let s = DispatchSemaphore(value :...