'Increase the the number of idle workers by C{n}.
@param n: The number of new idle workers to create.
@type n: L{int}'

def grow(self, n):

    self._quit.check()
    @self._coordinator.do
    def createOneWorker():
        for x in range(n):
            worker = self._createWorker()
            if (worker is None):
                return
            self._recycleWorker(worker)
