import sys
import signal
import time
import threading

def signalHandler(sig,id):
    sys.exit()

signal.signal(signal.SIGINT, signalHandler)
signal.signal(signal.SIGQUIT, signalHandler)
signal.signal(signal.SIGTERM, signalHandler)
signal.signal(signal.SIGHUP, signalHandler)

class Test(threading.Thread):
    def run(self):
        while True:
            print 'xxxxxxxxxxx'
            time.sleep(1)


def main():
    t = Test()
    t.start() 

if __name__ == '__main__':  
    main()

全局变量怎么用呢? 我加上全局变量不起作用,应该怎么写呢?

import sys
import signal
import time
import threading

NEEDEXIT = False

def signalHandler(sig,id):
    global NEEDEXIT
    NEEDEXIT = True
    sys.exit()

signal.signal(signal.SIGINT, signalHandler)
signal.signal(signal.SIGQUIT, signalHandler)
signal.signal(signal.SIGTERM, signalHandler)
signal.signal(signal.SIGHUP, signalHandler)

class Test(threading.Thread):
    def run(self):
        global NEEDEXIT
        while not NEEDEXIT:
            print 'xxxxxxxxxxx'
            time.sleep(1)


def main():
    t = Test()
    t.start() 

if __name__ == '__main__':  
    main()