Task.Delay cause tox offline

[randoms]

In tox loop.

while (_running)
{
      if (_cancelTokenSource.IsCancellationRequested)
          break;

      int delay = DoIterate();
      await Task.Delay(delay);
}

Task.Delay was used to sleep for some time. But if the threads in thread pool are not enough, it will take 500ms to create a new thread. This may cause tox offline. I recommend to use Thread.sleep instead.