from multiprocessing import Manager, Process, Lock



def func(dic, lock):
    lock.acquire()
    dic["count"] -= 1
    lock.release()
if __name__ == '__main__':
    m = Manager()
    lock = Lock()

    dic = m.dict({"count": 100})
    p_lst = []
    for i in range(1, 51):
        p = Process(target=func, args=(dic, lock))
        p.start()
        p_lst.append(p)

    for p in p_lst:
        p.join()
    print(dic["count"])