本文实例讲述了Python实现的多线程同步与互斥锁功能。分享给大家供大家参考,具体如下:
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#! /usr/bin/env python #coding=utf-8 import threading import time ''' #1、不加锁 num = 0 class MyThread(threading.Thread): def run(self): global num time.sleep(1) #一定要sleep!!! num = num + 1 msg = self.name + ' num is ---- ' + str(num) print msg def test(): for i in range(10): s = MyThread() #实例化一个Thread对象,每个Thread对象代表着一个线程 s.start() #通过start()方法,开始线程活动 ''' #''' class MyThread(threading.Thread): def run( self ): for i in range ( 3 ): time.sleep( 1 ) msg = self .name + ' @ ' + str (i) print msg def test(): for i in range ( 5 ): t = MyThread() t.start() #''' ''' #2、加锁 num = 0 #多个线程共享操作的数据 mu = threading.Lock() #创建一个锁 class MyThread(threading.Thread): def run(self): global num time.sleep(1) if mu.acquire(True): #获取锁状态,一个线程有锁时,别的线程只能在外面等着 num = num + 1 msg = self.name + ' num is ---- ' + str(num) print msg mu.release() #释放锁 def test(): for i in range(10): s = MyThread() s.start() ''' if __name__ = = '__main__' : test() |
运行结果:
再分别运行注释中的每一部分代码:
1. 不加锁:
2. 加锁:
希望本文所述对大家Python程序设计有所帮助。
原文链接:http://blog.csdn.net/will130/article/details/50474672