Terminate a multi-thread python program

Question

How to make a multi-thread python program response to Ctrl+C key event?

Edit: The code is like this:

import threading
current = 0

c         


        

Answer 1

A Worker might be helpful for you:

#!/usr/bin/env python

import sys, time
from threading import *
from collections import deque

class Worker(object):
    def __init__(self, concurrent=1):
        self.concurrent = concurrent
        self.queue = deque([])
        self.threads = []
        self.keep_interrupt = False

    def _retain_threads(self):
        while len(self.threads) < self.concurrent:
            t = Thread(target=self._run, args=[self])
            t.setDaemon(True)
            t.start()
            self.threads.append(t)


    def _run(self, *args):
        while self.queue and not self.keep_interrupt:
            func, args, kargs = self.queue.popleft()
            func(*args, **kargs)

    def add_task(self, func, *args, **kargs):
        self.queue.append((func, args, kargs))

    def start(self, block=False):
        self._retain_threads()

        if block:
            try:
                while self.threads:
                    self.threads = [t.join(1) or t for t in self.threads if t.isAlive()]
                    if self.queue:
                        self._retain_threads()
            except KeyboardInterrupt:
                self.keep_interrupt = True
                print "alive threads: %d; outstanding tasks: %d" % (len(self.threads), len(self.queue))
                print "terminating..."


# example
print "starting..."
worker = Worker(concurrent=50)

def do_work():
    print "item %d done." % len(items)
    time.sleep(3)

def main():
    for i in xrange(1000):
        worker.add_task(do_work)
    worker.start(True)

main()
print "done."

# to keep shell alive
sys.stdin.readlines()