# import os, subprocess, time, threading, signal
# timeout = 30
# def timed_out():
#     debug("operation timed out!")
#     os.kill(proc.pid, signal.SIGTERM)
# alarm = AlarmTimer(timeout, timed_out)
# alarm.start()

class AlarmTimer(threading.Thread):
    def __init__(self, timeout, action):
        threading.Thread.__init__(self)
        self.setDaemon(True)
        self.timeout = timeout
        self.action = action
        self.cancelled = False
    def run(self):
#        debug("AlarmTimer start")
        time.sleep(self.timeout)
#        debug("AlarmTimer sleep done")
        if not self.cancelled:
#            debug("AlarmTimer action!")
            self.action()
    def cancel(self):
#        debug("AlarmTimer cancel")
        self.cancelled = True