}

  private static final class DoNothingRunnable implements Runnable {
    @Override
    public void run() {}
  }

  // The thread executing the task publishes itself to the superclass' reference and the thread
  // interrupting sets DONE when it has finished interrupting.
  private static final Runnable DONE = new DoNothingRunnable();
  private static final Runnable PARKED = new DoNothingRunnable();

    ExecutorService executor = newDirectExecutorService();
    CyclicBarrier barrier = new CyclicBarrier(2);
    AtomicReference<Throwable> throwableFromOtherThread = new AtomicReference<>(null);
    Runnable doNothingRunnable =
        new Runnable() {
          @Override
          public void run() {}
        };

    Thread otherThread =
        new Thread(
            new Runnable() {
              @Override