A Stub for multiprocessing, also handles Ctrl+C correctly and kills childs

multiprocessing_stub.py

import sys
from argparse import ArgumentParser
from multiprocessing import Queue, Array
import multiprocessing
import signal
import os
import time


# this signal handler terminates the child-process on SIGINT or SIGTERM event
def sighandler(signal, frame):
    os._exit(0)
    

# worker thread definiton
def worker(id):
    # register handlers for SIGINT and SIGTERM
    signal.signal(signal.SIGINT, sighandler)
    signal.signal(signal.SIGTERM, sighandler)

    # Stub code!
    time.sleep(100)
    print("Hello this is Worker ID", id)
    
    
def main():
    parser = ArgumentParser(description='Do something multiprocessed.')
    parser.add_argument('-t', '--threads', metavar='N', type=int, help='Number of Threads to start, default 8', default=8)
    args = parser.parse_args()

    print("Starting up %d processes:" % args.threads)
    
    # Store the processes for later
    procs = []
    
    for i in range(args.threads):
        sys.stdout.write("\r\tStarting Worker Process: %d" %(i+1))
        sys.stdout.flush()
        p = multiprocessing.Process(target=worker, args=[i])
        procs.append(p)
        p.start()
    sys.stdout.write("\n")
    
    print("All processes started...")
    
    try:
        # Wait for the processes to stop
        for p in procs:
            p.join()

    except KeyboardInterrupt as e:
        # no need to terminate something here, because the processes should killed them self (sighandler)
        sys.exit(0)

    print("done working")


if __name__ == "__main__":
    main()