Question

I cannot catch the INT signal in the main thread, please advise me how to fix the problem. I wish that the sleep method could be interrupted by CTRL+C, but it waits till the timer is ended..

import pygtk
pygtk.require('2.0')

import gtk
import time
import urllib2
import re
import signal
import sys

import __main__

from time import ctime, strftime, localtime
from threading import Thread

myThread = None

class MyThread(Thread):

    def __init__(self, filename):
        Thread.__init__(self)
        self.filename = filename;
        self.terminate = False

    def StopProcess(self):
        self.terminate = True

    def run(self):
        while self.terminate <> True:
            time.sleep(5)
            self.terminate = True

def SignalHandler(signum, frame):
    if (myThread <> None):
        myThread.StopProcess()
    sys.exit()

if __name__ == "__main__":

    signal.signal(signal.SIGINT, SignalHandler)

    myThread = MyThread("aaa")
    myThread.start()

Answer 1

Believe it or not, this will work.

from Queue import Queue, Empty
def signal_safe_sleep(delay):
  q = Queue()
  try: q.get(True, delay)
  except Empty: pass

Alternatively, you can create some file descriptors using os.pipe() and then use select.select() on them within your signal_safe_sleep function. Both approaches will allow Python signal handlers to be called before signal_safe_sleep returns.