def extendleft(self, iterable):
        """Extend the left side of this GeventDeque by appending
        elements from the iterable argument.  Note, the series of left
        appends results in reversing the order of elements in the
        iterable argument.
        """
        self._deque.extendleft(iterable)
        if len(self._deque) > 0:
            self.notEmpty.set()