how to keep multiprocessing main process always exists?

Question

I want to achieve a application, to spawn new process execute tasks, basically like below.

web----->pyro----->multiprocessing

Through web send command,and communicate with pyro, and then pyro spwan new process to handle the task script.

What confused me is..

1. When I send tasks through pyro once, I send another task, is it possible? How to keep the master process multiprocessing, when the task is idle, I want to keep the master process alive always wait for new tasks.
2. Is this design redundancy or any other better design.