How to avoid cascading async functions?

Using Swift
11

Would something like this work?

func sync_meets_async () {
    ...
    let s = DispatchSemaphore (value: 0)
    Task {
        await async_world ()
        s.signal()
    }
    ...
    print ("waiting for async_world to finish...")
    s.wait()
    print ("finished")
}

func async_world () async {
    try! await Task.sleep(until: .now + .seconds(7))
}