code: private void pessimisticFindFirst(
                                       DeleteStack    stack)
      {
          Object q = null;
          int v1 = 0;
          int x1 = 0;
  
          synchronized(_index)
          {
              q = getFirst(stack);
              v1 = _index.vno();
              x1 = _index.xno();
              _pessimisticFindFirsts++;
          }
  
          _current1.setLocation(q, v1, x1);
      }
docs: Find first key in index using pessimistic locking.
  
  @param stack The stack to use to record the traversal