python线程锁

import time,threading

balance = 0

lock = threading.Lock()

def change_it(n):

    global balance

    balance = balance + n

    balance = balance - n

def run_thread(n):

    for i in range(1000000):

        #先获取锁

        lock.acquire()

        try:

            change_it(n)

        finally:

            #改完了一定要释放锁

            lock.release()

t1 = threading.Thread(target=run_thread,args=(5,))

t2 = threading.Thread(target=run_thread,args=(8,))

t1.start()

t2.start()

t1.join()

t2.join()

print(balance)

线程锁的简单实现。