from multiprocessing import Process,Manager,Lock

def func(dic,lock):
    lock.acquire()
    dic["count"] -= 1
    lock.release()
if __name__ == '__main__':
    m = Manager()
    dic = m.dict({"count":100})
    p_lst = []
    lock = Lock()
    for i in range(20):
        p = Process(target=func,args=(dic,lock))
        p.start()
        p_lst.append(p)
    
 
for p in p_lst:p.join()
    print("主程序:",dic)