python-生产者消费者模式

 #!/usr/bin/python
 #coding=utf-8

 import threading,time
 lock=threading.Condition()
 product=0
 class Make(threading.Thread):
     def __init__(self,lock):
         self.lock=lock
         super(Make,self).__init__()

     def run(self):
         global product
         while 1:
             if self.lock.acquire():
                 if product>=1000:
                     self.lock.wait()
                 else:
                     product+=100
                     print "add 100,product count="+str(product)
                     self.lock.notify()
                 self.lock.release()
                 time.sleep(2)

 class Cost(threading.Thread):
     def __init__(self,lock):
         self.lock=lock
         super(Cost,self).__init__()

     def run(self):
         global product
         while 1:
             if self.lock.acquire():
                 if product<=100:
                     self.lock.wait()
                 else:
                     product-=60
                     print "cost 60,product count="+str(product)
                     self.lock.notify()
                 self.lock.release()
                 time.sleep(1)

 def test():
     for i in range(5):
         n=Make(lock)
         n.start()
     for i in range(5):
         m=Cost(lock)
         m.start()
 if __name__=="__main__":
     test()