线程的那点事情02 --事件

还是卖包子的故事， 我们在生产者消费者模型里面，消费者一直问有没有包子，生产者一直生产包子

那么可不可以这样，消费者过来问：有没有包子的时候，告诉他没有，等过会做好了，叫你。

我们可以通过event来做线程间信号传递

 1 __author__ = ‘Rico‘
 2 #coding:utf-8
 3
 4 import threading
 5 import time
 6
 7
 8 def Producer():
 9     print ‘cook:wait for somebody‘
10     event.wait()
11     event.clear()
12     print ‘cook:somebody is coming for baozi‘
13     print ‘make some baozi‘
14     time.sleep(5)
15     print ‘The baozi is ready‘
16     event.set()
17 def Consumer():
18     print u‘jack:go buy some baozi‘
19     event.set()
20     time.sleep(2)
21     while 1:
22         if event.is_set():
23             print  ‘Thinks‘
24             break
25         else:
26             print ‘Please do it quickly ‘
27             time.sleep(1)
28
29 event = threading.Event()
30 p = threading.Thread(target=Producer)
31 c = threading.Thread(target=Consumer)
32 p.start()
33 c.start()