}
    }

    @Override
    void putThread(Waiter waiter, Thread newValue) {
      waiterThreadUpdater.setRelease(waiter, newValue);
    }

    @Override
    void putNext(Waiter waiter, @Nullable Waiter newValue) {
      waiterNextUpdater.setRelease(waiter, newValue);
    }

    @Override
    boolean casWaiters(