`timeout-decorator` with `threading` or `multiprocessing`

main.py

import multiprocessing
import threading
import time

import timeout_decorator


def countup():
    for i in range(1, 10):
        time.sleep(1)
        print('  {} seconds have passed '.format(i))


@timeout_decorator.timeout(2.5, use_signals=True)
def countup_use_signals():
    countup()


@timeout_decorator.timeout(2.5, use_signals=False)
def countup_unuse_signals():
    countup()


def main():
    try:
        print(' Start use_signals=True ')
        countup_use_signals()
    except Exception as e:
        print(f'  error: {e}')

    try:
        print(' Start use_signals=False ')
        countup_unuse_signals()
    except Exception as e:
        print(f'  error: {e}')


if __name__ == '__main__':
    print('main thread')
    main()

    print('multiprocessing')
    p = multiprocessing.Process(target=main)
    p.start()
    p.join()

    print('threading')
    t = threading.Thread(target=main)
    t.start()
    t.join()

output.txt

main thread
 Start use_signals=True
  1 seconds have passed
  2 seconds have passed
  error: 'Timed Out'
 Start use_signals=False
  1 seconds have passed
  2 seconds have passed
  error: 'Timed Out'
multiprocessing
 Start use_signals=True
  1 seconds have passed
  2 seconds have passed
  error: 'Timed Out'
 Start use_signals=False
  1 seconds have passed
  2 seconds have passed
  error: 'Timed Out'
threading
 Start use_signals=True
  error: signal only works in main thread
 Start use_signals=False
  1 seconds have passed
  2 seconds have passed
  error: 'Timed Out'