public static async Task processController(WorkloadController controller)
{
source = new CancellationTokenSource();
source.Token.Register(CancelNotification);
var completionSource = new TaskCompletionSource <object>();
source.Token.Register(() => completionSource.TrySetCanceled());
var task = Task.Factory.StartNew(() => controller.Run(), source.Token);
await Task.WhenAny(task, completionSource.Task);
}