Async/Await Snipped: Ensure one-time execution

Think if you have some initialization code that you want to execute only once. Multiple threads could call in. Your code uses async and await keywords and you want to be able to await until it completes…

        Task _workerTask;

        object _workerSyncRoot = new object();

        async Task EnsureWorkerDoneAsync()
            // ensure that the worker is executed only once
            lock (_workerSyncRoot)
                if (_workerTask == null)
                    _workerTask = WorkerAsync();
            // await the worker, if it has not
            if (_workerTask.Status != TaskStatus.RanToCompletion)
                await _workerTask;
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