import Dispatch actor SafeCounter { private var value = 0 func increment() { value += 1 } func get() -> Int { value } } let counter = SafeCounter() print("Start") let sem = DispatchSemaphore(value: 0) Task { await withTaskGroup(of: Void.self) { group in for _ in 0..<1000 { group.addTask { await counter.increment() } } } print("Final: \(await counter.get())") sem.signal() } sem.wait() print("Done")