Python how to kill threads blocked on queue with signals?

Question

I start a bunch of threads working on a queue and I want to kill them when sending the SIGINT (Ctrl+C). What is the best way to handle this?

targets = Queue.         


        

Answer 1

I managed to solve the problem by emptying the queue on KeyboardInterrupt and letting threads to gracefully stop themselves.

I don't know if it's the best way to handle this but is simple and quite clean.

targets = Queue.Queue()
threads_num = 10
threads = []

for i in threads_num:
    t = MyThread()
    t.setDaemon(True)
    threads.append(t)
    t.start()

while True:
    try:
        # If the queue is empty exit loop
        if self.targets.empty() is True:
            break

    # KeyboardInterrupt handler
    except KeyboardInterrupt:
        print "[X] Interrupt! Killing threads..."
        # Substitute the old queue with a new empty one and exit loop
        targets = Queue.Queue()
        break

# Join every thread on the queue normally
targets.join()