python 线程锁 共享全局变量 线程通信

注意：全局变量不必做为参数传到函数里！！！

import threading # 银行存钱和取钱 # 存钱1万次 def add(lock): global money #money为全局变量 for i in range(1000000): # 2. 操作变量之前进行加锁 lock.acquire() money += 1 # money; money+1; money=money+1; # 3. 操作变量之后进行解锁 lock.release() print("存钱后的钱数：",money) # 取钱1万次 def reduce(lock): global money for i in range(1000000): # 2. 操作变量之前进行加锁 lock.acquire() money -= 1 # 3. 操作变量之后进行解锁 lock.release() print("取钱后的钱数：", money) if __name__ == '__main__': # 全局变量 money = 0 # 实例化一个锁对象; lock = threading.Lock() t1 = threading.Thread(target=add,args=(lock,)) t2 = threading.Thread(target=reduce,args=(lock,)) t1.start() t2.start() t1.join() t2.join() print("当前金额:", money)