(internal) starts input and output pool queue manager threads.

def _start_managers(self):
        """
        (internal) starts input and output pool queue manager threads.
        """
        self._task_queue = _Weave(self._tasks, self.stride)
        # here we determine the size of the maximum memory consumption
        self._semaphore_value = (self.buffer or (len(self._tasks) * self.stride))
        self._pool_semaphore = Semaphore(self._semaphore_value)


        # start the pool getter thread
        self._pool_getter = Thread(target=self._pool_get, args=(self._getout, \
                self._task_results, self._next_available, \
                self._task_next_lock, self._next_skipped, len(self._tasks), \
                len(self.pool), id(self)))
        self._pool_getter.deamon = True
        self._pool_getter.start()

        # start the pool putter thread
        self._pool_putter = Thread(target=self._pool_put, args=\
                (self._pool_semaphore, self._task_queue, self._putin, \
                len(self.pool), id(self), self._stopping.isSet))
        self._pool_putter.deamon = True
        self._pool_putter.start()