Mine

#!/usr/bin/pythonimport threading, time, signalclass WorkThread( threading.Thread ):	def __init__(self):		threading.Thread.__init__(self)		self._wantStop = False		self._safeStop = True	def shutdown(self):		self._wantStop = True	def run(self):		while 1:			if self._wantStop:				break			self._safeStop = False			dostuff()			self._safeStop = True			time.sleep(3)def signalHandler(signal, frame):	global worker	if not worker._wantStop: 		worker.shutdown()		while worker.isAlive():			print 'waiting on worker'			time.sleep(1)	else: print 'user insisted we stop now'	print 'worker finished'	def dostuff():	print 'hello'	time.sleep(3)if __name__ == '__main__':	worker = WorkThread()	signal.signal(signal.SIGINT, signalHandler)	worker.start()