}
      return n;
    } finally {
      monitor.leave();
    }
  }

  /**
   * Returns an iterator over the elements in this queue in proper sequence. The returned {@code
   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon

      }
      return n;
    } finally {
      monitor.leave();
    }
  }

  /**
   * Returns an iterator over the elements in this queue in proper sequence. The returned {@code
   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon