*/
  private boolean casWaiters(@Nullable Waiter expect, @Nullable Waiter update) {
    return ATOMIC_HELPER.casWaiters(this, expect, update);
  }

  /**
   * Performs a {@linkplain java.lang.invoke.VarHandle#getAndSet get-and-set} operation on {@link
   * #waitersField}.
   */
  private final @Nullable Waiter gasWaiters(Waiter update) {
    return ATOMIC_HELPER.gasWaiters(this, update);
  }

  /**

   */
  private boolean casWaiters(@Nullable Waiter expect, @Nullable Waiter update) {
    return ATOMIC_HELPER.casWaiters(this, expect, update);
  }

  /**
   * Performs a {@linkplain java.lang.invoke.VarHandle#getAndSet get-and-set} operation on {@link
   * #waitersField}.
   */
  private final @Nullable Waiter gasWaiters(Waiter update) {
    return ATOMIC_HELPER.gasWaiters(this, update);
  }

  /**