testing Thread.join from a signal handler

threads_signals.py

#!/usr/bin/env python

from datetime import datetime
import os
import signal
import sys
import threading
import time


def main(environ, args):
    log("starting main")
    thread = Pauser(5)
    signal.signal(signal.SIGTERM, sighandler(thread))

    thread.start()
    time.sleep(1)
    log("sending TERM signal")
    os.kill(os.getpid(), signal.SIGTERM)

    log("main beginning 5 second sleep")
    time.sleep(5)
    log("main finished sleep, exiting")

    return 0


_start = datetime.now()

def log(msg):
    print("({} elapsed) {}".format(datetime.now() - _start, msg))


def sighandler(thread):
    def handler(signum, frame):
        log("signal handler invoked for signal {}".format(signum))
        thread.join()
        log("signal handler successfully joined thread")
    return handler


class Pauser(threading.Thread):
    def __init__(self, pause_time):
        super(Pauser, self).__init__()
        self.pause_time = pause_time

    def run(self):
        log("pauser beginning {} second sleep".format(self.pause_time))
        time.sleep(self.pause_time)
        log("pauser finished sleep, exiting")


if __name__ == "__main__":
    sys.exit(main(os.environ, sys.argv))