线程安全及解决

1.安全概念介绍

2. Lock用于解决线程安全

代码实现

import threading
import time
class Account:
    def __init__(self,balance):
        self.balance = balance
lock = threading.Lock()
def draw(account,amount):
    with lock:
        if account.balance > amount:
            time.sleep(0.1)# 存在耗时任务时就会有线程切换
            print(threading.current_thread().name,'取钱成功')
            account.balance -= amount
            print(threading.current_thread().name, '余额',account.balance)
        else:
            print(threading.current_thread().name,'余额不足')
if __name__ == '__main__':
    account = Account(1000)
    t1 = threading.Thread(name='t1',target=draw,args=(account,800))
    t2 = threading.Thread(name='t2', target=draw, args=(account, 800))
    t1.start()
    t2.start()
    t1.join()
    t2.join()