an example of a python script that watches all threads for early termination

thread_monitor.py

from threading import Thread, enumerate
import logging


def fails():
    for i in range(999999999):
        assert i < 9999999


def succeeds():
    while True:
        assert 2 == 2


def watcher():
    init_threads = enumerate()
    while True:
        curr_threads = enumerate()
        if len(curr_threads) < len(init_threads):
            for thread in init_threads:
                if thread not in curr_threads:
                    logging.error(thread.name + " not found")
            init_threads = curr_threads


if __name__ == "__main__":
    t1 = Thread(target=succeeds, name="succeeds")
    t2 = Thread(target=fails, name="fails")
    t3 = Thread(target=watcher, name="watcher")
    t1.start()
    t2.start()
    t3.start()