Code first:

'''this is main structure of my program'''

from twisted.web import http
from twisted.protocols import basic
import threading

threadstop = False    #thread trigger,to be done
class MyThread(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        self.start()

    def run(self):
        while True:
            if threadstop:
                return
            dosomething()


'''def some function'''

if __name__ == '__main__':
    from twisted.internet import reactor
    t = MyThread()
    reactor.listenTCP(serverport,myHttpFactory())
    reactor.run()

As my first multithread program,I feel happy that it works as expected.But now I find I cannot control it.If I run it on front,Control+C can only stop the main process,and I can still find it in processlist;if I run it in background,I have to use kill -9 pid to stop it.And I wonder if there's a way to control the subthread process by a trigger variale,or a better way to stop the whole process other than kill -9.Thanks.