Python多线程-2（线程共享全局变量）

 

 

例子：

from threading import Thread,Lock from time import sleep, ctime global_num = [] def func1(): global global_num for i in range(5): sleep(1)  #假设是最耗时的主过程
        lock.acquire()#两个线程会最开始抢这个锁，拿到锁就会处于关锁，执行后面的程序，其他线程执行处于监听状态，等待这个线程开锁，再抢锁
        global_num.append(1) print('-----%s---func1----:global_num=%s--------\n'%(ctime(),global_num)) lock.release() def func2(): global global_num for i in range(3): sleep(1) lock.acquire() global_num.append(2) print('-----%s---func2-----:global_num=%s========\n'%(ctime(),global_num)) lock.release() print('global_num=',global_num) lock = Lock() t1 = Thread(target=func1) t1.start() t2 = Thread(target=func2) t2.start() t1.join() t2.join() print('global_num=%s\n'%global_num)

　　python进阶之多线程对同一个全局变量的处理