Python线程创建和终止实例代码

import threading 
import time 
class mythread(threading.Thread): 
 def __init__(self,stopevt = None,File=None,name = 'subthread',Type ='event'): 
  threading.Thread.__init__(self) 
  self.stopevt = stopevt 
  self.name = name 
  self.File = File 
  self.Type = Type 
   
     
 def Eventrun(self): 
  while not self.stopevt.isSet(): 
   print self.name +' alive\n' 
   time.sleep(2) 
  if self.File: 
   print 'close opened file in '+self.name+'\n' 
   self.File.close() 
  print self.name +' stoped\n' 
  
 def Daemonrun(self): 
  D = mythreadDaemon(self.File) 
  D.setDaemon(True) 
  while not self.stopevt.isSet(): 
   print self.name +' alive\n' 
   time.sleep(2) 
  print self.name +' stoped\n' 
 def run(self): 
  if self.Type == 'event': self.Eventrun() 
  else: self.Daemonrun() 
class mythreadDaemon(threading.Thread): 
 def __init__(self,File=None,name = 'Daemonthread'): 
  threading.Thread.__init__(self) 
  self.name = name 
  self.File = File 
 def run(self): 
  while True: 
   print self.name +' alive\n' 
   time.sleep(2) 
  if self.File: 
   print 'close opened file in '+self.name+'\n' 
   self.File.close() 
  print self.name +' stoped\n' 
   
def evtstop(): 
 stopevt = threading.Event() 
 FileA = open('testA.txt','w') 
 FileB = open('testB.txt','w') 
 A = mythread(stopevt,FileA,'subthreadA') 
 B = mythread(stopevt,FileB,'subthreadB') 
 print repr(threading.currentThread())+'alive\n' 
 print FileA.name + ' closed?
 '+repr(FileA.closed)+'\n' 
 print FileB.name + ' closed? '+repr(FileB.closed)+'\n' 
 A.start() 
 B.start() 
 time.sleep(1) 
 print repr(threading.currentThread())+'send stop signal\n' 
 stopevt.set() 
 A.join() 
 B.join() 
 print repr(threading.currentThread())+'stoped\n' 
 print 'after A stoped, '+FileA.name + ' closed? '+repr(FileA.closed)+'\n' 
 print 'after A stoped, '+FileB.name + ' closed?

 '+repr(FileB.closed)+'\n' 
def daemonstop(): 
 stopevt = threading.Event() 
 FileA = open('testA.txt','r') 
 A = mythread(stopevt,FileA,'subthreadA',Type = 'Daemon') 
 print repr(threading.currentThread())+'alive\n' 
 print FileA.name + ' closed?

 '+repr(FileA.closed)+'\n' 
 A.start() 
 time.sleep(1) 
 stopevt.set() 
 A.join() 
 print repr(threading.currentThread())+'stoped\n' 
 print 'after A stoped, '+FileA.name + ' closed? '+repr(FileA.closed)+'\n' 
 if not FileA.closed: 
  print 'You see the differents, the resource in subthread may not released with setDaemon()' 
  FileA.close() 
if __name__ =='__main__': 
 print '-------stop subthread example with Event:----------\n' 
 evtstop() 
 print '-------Daemon stop subthread example :----------\n' 
 daemonstop() 

-------stop subthread example with Event:---------- 
<_MainThread(MainThread, started 2436)>alive 
testA.txt closed?
 False 
testB.txt closed? False 
subthreadA alive 
subthreadB alive 
 
<_MainThread(MainThread, started 2436)>send stop signal 
close opened file in subthreadA 
close opened file in subthreadB 
 
subthreadA stoped 
subthreadB stoped 
 
<_MainThread(MainThread, started 2436)>stoped 
after A stoped, testA.txt closed? True 
after A stoped, testB.txt closed?

 True 
-------Daemon stop subthread example :---------- 
<_MainThread(MainThread, started 2436)>alive 
testA.txt closed?

 False 
subthreadA alive 
subthreadA stoped 
<_MainThread(MainThread, started 2436)>stoped 
after A stoped, testA.txt closed? False 
You see the differents, the resource in subthread may not released with setDaemon()