/** Queues with tasks that are currently executing their [TaskQueue.activeTask]. */
  private val busyQueues = mutableListOf<TaskQueue>()

  /** Queues not in [busyQueues] that have non-empty [TaskQueue.futureTasks]. */
  private val readyQueues = mutableListOf<TaskQueue>()

  private val runnable: Runnable =
    object : Runnable {
      override fun run() {
        var task: Task =
          withLock {

        new Runnable() {
          @Override
          public void run() {
            threadLocalCount.set(threadLocalCount.get() + 1);
          }
        };

    FutureTask<@Nullable Void> otherTask =
        new FutureTask<>(
            () -> {
              Future<?> future = executor.submit(incrementTask);
              assertTrue(future.isDone());

        new Runnable() {
          @Override
          public void run() {
            threadLocalCount.set(threadLocalCount.get() + 1);
          }
        };

    FutureTask<@Nullable Void> otherTask =
        new FutureTask<>(
            () -> {
              Future<?> future = executor.submit(incrementTask);
              assertTrue(future.isDone());

    Runnable runChosenTest =
        new Runnable() {
          @Override
          public void run() {
            runChosenTest();
          }
        };
    FutureTask<@Nullable Void> task = new FutureTask<>(runChosenTest, null);
    startThread(
        new Runnable() {
          @Override
          public void run() {
            task.run();
          }
        });