* interrupt, yet it will still run, since interruptTask will leave the runner value null,
     * allowing the CAS below to succeed.
     */
    Thread currentThread = Thread.currentThread();
    if (!compareAndSet(null, currentThread)) {
      return; // someone else has run or is running.
    }

    boolean run = !isDone();
    T result = null;
    Throwable error = null;
    try {
      if (run) {

        AbstractFutureState<?> future, @Nullable Waiter expect, @Nullable Waiter update) {
      return waitersUpdater.compareAndSet(future, expect, update);
    }

    @Override
    boolean casListeners(
        AbstractFutureState<?> future, @Nullable Listener expect, Listener update) {
      return listenersUpdater.compareAndSet(future, expect, update);
    }

    @Override

        AbstractFutureState<?> future, @Nullable Waiter expect, @Nullable Waiter update) {
      return waitersUpdater.compareAndSet(future, expect, update);
    }

    @Override
    boolean casListeners(
        AbstractFutureState<?> future, @Nullable Listener expect, Listener update) {
      return listenersUpdater.compareAndSet(future, expect, update);
    }

    @Override

       * other callers have added to it.
       *
       * This read is guaranteed to get us the right value because we only set this once (here).
       *
       * requireNonNull is safe because either our compareAndSet succeeded or it failed because
       * another thread did it for us.
       */
      seenExceptionsLocal = requireNonNull(seenExceptionsField);
    }
    return seenExceptionsLocal;
  }

    for (int i = 0; i < 10; i++) {
      int expectedCount = i;
      list.add(
          new Runnable() {
            @Override
            public void run() {
              integer.compareAndSet(expectedCount, expectedCount + 1);
            }
          },
          directExecutor());
    }
    list.execute();
    assertEquals(10, integer.get());
  }

      }
    } finally {
      readCompleteLatch.countDown()
    }
  }

  abstract fun listSource(): Source

  override fun ensureLoaded() {
    if (!listRead.get() && listRead.compareAndSet(false, true)) {
      readTheListUninterruptibly()
    } else {
      try {
        readCompleteLatch.await()
      } catch (_: InterruptedException) {

    for (int i = 0; i < 10; i++) {
      int expectedCount = i;
      list.add(
          new Runnable() {
            @Override
            public void run() {
              integer.compareAndSet(expectedCount, expectedCount + 1);
            }
          },
          directExecutor());
    }
    list.execute();
    assertEquals(10, integer.get());
  }

      executionList.add(listener, exec);

      // When a listener is first added, we run a task that will wait for the delegate to finish,
      // and when it is done will run the listeners.
      if (hasListeners.compareAndSet(false, true)) {
        if (delegate.isDone()) {
          // If the delegate is already done, run the execution list immediately on the current
          // thread.
          executionList.execute();

    check(executed.compareAndSet(false, true)) { "Already Executed" }

    timeout.enter()
    callStart()
    try {
      client.dispatcher.executed(this)
      return getResponseWithInterceptorChain()
    } finally {
      client.dispatcher.finished(this)
    }
  }

  override fun enqueue(responseCallback: Callback) {
    check(executed.compareAndSet(false, true)) { "Already Executed" }

        executingTaskQueue.thread = null;
      }
    }

    private boolean trySetStarted() {
      return compareAndSet(NOT_RUN, STARTED);
    }

    private boolean trySetCancelled() {
      return compareAndSet(NOT_RUN, CANCELLED);
    }
  }