How to stop multiple threads python

Question

I have 2 threads in my program that I wish to stop on keyboard interrupt but I dont know how to do it. One of the threads has a while loop and the other is just a function which calls a class full of functions. Please help thank you.

Stopping the program

You can use a thread to wait for the user to input some value to break the threads. Look at [How to stop a thread in Python](https://www.pythontutorial.net/python-concurrency/python-stop-thread/). — Alias Cartellano, Apr 10 '23 at 17:53
I made [some code](https://textdoc.co/1pjxQGsSLmtAKdIZ) to demonstrate how this can be done. It's based on the link I used in my comment above. — Alias Cartellano, Apr 11 '23 at 02:04
Thank you very much for your response, it worked perfectly fine with two threads but with the other thread its not working, when i type exit its stops two and starts the other. Can i put 3 threads in that please? Thank you — Andrea Gatt, Apr 11 '23 at 14:36

score 1 · Answer 1 · answered Apr 10 '23 at 18:17

1

it's simple you have only to kill thread

#Start a new thread
t = multiprocessing.Process(target = func)
t.start()
#Kill the thread
t.kill()

answered Apr 10 '23 at 18:17

Xavier

11
1

Hello and thank you for your response, currently I am using the threadding module not the processing module, but i still tried it and when i ran the program it said would you like to kill the program – Andrea Gatt Apr 10 '23 at 18:42

score 1 · Answer 2 · answered Apr 10 '23 at 18:38

1

You can use KeyboardInterrupt to catch CTRL+C input and do kill threads.

t = None
try:
    t = multiprocessing.Process(target = func)
    t.start()
except KeyboardInterrupt:
    t.kill()
    print("stopping")

answered Apr 10 '23 at 18:38

digital_monk

78
5

Hello and thank you for your response, I have just tried that right now and the program automatically says "Your program is still Running! Do you want to kill it?" exactly when I press the run button – Andrea Gatt Apr 10 '23 at 18:57
@AndreaGatt does [this](https://stackoverflow.com/questions/46039560/using-quit-exit-etc-says-the-program-is-still-running-do-you-want-to-ki) help? – digital_monk Apr 11 '23 at 12:10

JIST · Answer 3 · 2023-04-10T18:29:51.510

I am using this logic for standard thread canceling:

1. MainThread

I run input from keyboard in main process/thread
I can setup event via threading.Event().set()
See code sample for class MainThread(threading.Thread)

def __init__(self,  *args, **kwargs):
    super(StoppableThread, self).__init__(*args, **kwargs)
    self._stop_event = threading.Event()

def stop(self):
    self._stop_event.set()

def stopped(self):
    return self._stop_event.is_set()

2. BackgroudThreads

Background threads are checking (periodically) this signal state and can close their execution.

BTW: nice clarification see article

How to stop multiple threads python

3 Answers3