<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def terminate_pool(self):
 """Terminate and close the multiprocessing pool if necessary."""


        if self.pool is not None:
            self.pool.terminate()
            self.pool.join()
            del(self.pool)
            self.pool = None