# Multiprocessing:  Sharing data between processes (a Value or Array memory share must be created as processes do not share data by default

from multiprocessing import Process, Value, Array, Lock
import os
import time

def add_100(number, lock):
    for _ in range(100):
        time.sleep(0.01)
        with lock:
            number.value += 1
    print(f'Process {os.getpid()} has finished execution.')

if __name__ == "__main__":
    lock = Lock()
    shared_number = Value('i', 0)

    print('Number at the beginning is: ', shared_number.value)
    p1 = Process(target=add_100, args=(shared_number, lock))
    p2 = Process(target=add_100, args=(shared_number, lock))
    p1.start()
    p2.start()
    p1.join()
    p2.join()
    print('Number at the end is: ', shared_number.value)