python用锁，为什么创建进程时必须传入lock，创建线程时传不传都可以？

# 创建进程时args不传lock，报错，传不报错
import multiprocessing
import os
import time
def run():
    lock.acquire()
    try:
        print(f'子进程 {os.getpid()}')
        time.sleep(1)
    finally:
        lock.release()
if __name__=='__main__':
    print(f'主进程 {os.getpid()}')
    lock=multiprocessing.Lock()
    process_list=[]
    for i in range(10):
        sub_process=multiprocessing.Process(target=run)
        sub_process.start()
        process_list.append(sub_process)
    for j in process_list:
        j.join()
# 创建线程时args传不传lock都不报错
import threading
money = 250
def run(n,lock):
    global money
    for i in range(100000):
        lock.acquire()
        try:
            money = money + n
            money = money - n
        finally:
            lock.release()
if __name__ == '__main__':
    lock = threading.Lock()
    while True:
        t1 = threading.Thread(target=run, args=(10,lock))
        t2 = threading.Thread(target=run, args=(15,lock))
        t1.start()
        t2.start()
        t1.join()
        t2.join()
        if money != 250:
            break
    print(money)

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