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I have a python script that starts a process using multiprocessing Process class. Inside that process I start a thread with an infinite loop, and I simulate an exception on the main thread by doing exit(1). I was expecting exit to kill the process, but it doesn't, and the main thread reports it as alive.

I have tried with both raising exception and calling exit, but none work. I have tried waiting for the process to finish by waiting for is_alive, and by calling join. But both have the same behavior.

from multiprocessing import Process from threading import Thread from time import sleep def infinite_loop(): while True: print("It's sleeping man") sleep(1) def start_infinite_thread(): run_thread = Thread(target=infinite_loop) run_thread.start() exit(1) def test_multi(): x = Process(target=start_infinite_thread) x.start() sleep(5) assert not x.is_alive()

I am expecting the process not to be alive, but the assert fails.

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Thanks @Imperishable Night for the reply, by setting the thread as daemon the test passes. Code that works:

from multiprocessing import Process from threading import Thread from time import sleep def infinite_loop(): while True: print("It's sleeping man") sleep(1) def start_infinite_thread(): run_thread = Thread(target=infinite_loop) run_thread.daemon = True run_thread.start() exit(1) def test_multi(): x = Process(target=start_infinite_thread) x.start() sleep(1) assert not x.is_alive()
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