image download problem (python)

[zyy max]

I was trying to download images with multi-thread, which has a limited max_count in python.

Each time a download_thread is started, I leave it alone and activate another one. I hope the download process could be ended in 5s, which means downloading is failed if opening the url costs more than 5s.

But how can I know it and stop the failed thread??? Thanks for your help!!!
I tried to use thread.join(timeout),just like this:

#!/usr/bin/env python                                                           
 
from threading import Thread      
import threading                                              
import time            
import urllib2                                                         
 
class ReaderThread(threading.Thread):                                                     
    def __init__(self):                                                         
        threading.Thread.__init__(self)                                                   
 
    def run(self):         
        print "downloading"    
        try:                                                  
            source = urllib2.urlopen('http://img.taotaosou.cn/look/1/4/971/485839/485839_160.jpg').read()                                                                        
            open('test.jpg', 'w').write(source)                                                          
            print "finished downloading"                                               
        except:
            print '!!!'                                               
 
 
for i in range(100):
    print threading.activeCount()                                                    
    thread = ReaderThread()  
    thread.setDaemon(False)                                                       
    thread.start()                                                                  
    print "joining..."                                                              
    thread.join(5)                                                                 
    print "joined"   

I just hope the threading.activeCount() is less than a MAX_NUM all the time

[zyy max]

just set timeout while opening a webpage could solve it .e.g.urllib2.urlopen(url, None, 10)