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Python线程的两种编程方式

Jun 10, 2016 pm 03:15 PM
python thread

Python中如果要使用线程的话,python的lib中提供了两种方式。一种是函数式,一种是用类来包装的线程对象。举两个简单的例子希望起到抛砖引玉的作用,关于多线程编程的其他知识例如互斥、信号量、临界区等请参考python的文档及相关资料。
1、调用thread模块中的start_new_thread()函数来产生新的线程,请看代码:

复制代码 代码如下:

###        thread_example.py  
import time 
import thread 
def timer(no,interval):  #自己写的线程函数  
        while True:  
                print 'Thread :(%d) Time:%s'%(no,time.ctime())  
                time.sleep(interval)  
def test(): #使用thread.start_new_thread()来产生2个新的线程  
        thread.start_new_thread(timer,(1,1))    
        thread.start_new_thread(timer,(2,3))  
if __name__=='__main__':  
        test() 

这个是thread.start_new_thread(function,args[,kwargs])函数原型,其中function参数是你将要调用的线程函数;args是讲传递给你的线程函数的参数,他必须是个tuple类型;而kwargs是可选的参数。
线程的结束一般依靠线程函数的自然结束;也可以在线程函数中调用thread.exit(),他抛出SystemExit exception,达到退出线程的目的。
2、通过调用threading模块继承threading.Thread类来包装一个线程对象。请看代码:
复制代码 代码如下:

import threading 
import time 
class timer(threading.Thread):     #我的timer类继承自threading.Thread类  
    def __init__(self,no,interval):   
        #在我重写__init__方法的时候要记得调用基类的__init__方法  
        threading.Thread.__init__(self)       
        self.no=no  
        self.interval=interval  
          
    def run(self):  #重写run()方法,把自己的线程函数的代码放到这里  
        while True:  
            print 'Thread Object (%d), Time:%s'%(self.no,time.ctime())  
            time.sleep(self.interval)  
              
def test():  
    threadone=timer(1,1)    #产生2个线程对象  
    threadtwo=timer(2,3)  
    threadone.start()   #通过调用线程对象的.start()方法来激活线程  
    threadtwo.start()  
      
if __name__=='__main__':  
    test()
 
其实thread和threading的模块中还包含了其他的很多关于多线程编程的东西,例如锁、定时器、获得激活线程列表等等,请大家仔细参考python的文档!
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