Python多執行緒之event

事件(event)用於執行緒間同步和通訊。比如執行緒a要完成某一任務(event)執行緒b才能執行後面的**，怎麼實現呢，就是用event。

event常用方法

釋義set()

開始乙個事件

wait()

如果未設定set狀態會一直等待，否則過

clear()

清除set狀態

isset()

是否設定set狀態

注意：

wait方法是阻塞的

設定完set後要使用clear方法，否則wait為真，不會等待

#!/usr/bin python

#coding=utf-8
import threading
import time
defproducer
():print
u'等人來買包子....'
event.wait()
#event.clear()
print event.isset()
print
u'chef:sb is coming for baozi...'
print
u'chef:****** a baozi for sb...'
time.sleep(5)
print
u'chef:你的包子好了...'
event.set() 
defconsumer
():print
u'chenchao:去買包子....'
event.set()
time.sleep(2)
print
'chenchao:waiting for baozi to be ready...'
print event.wait()
print
u'chenchao:哎呀真好吃....'
event = threading.event()
p = threading.thread(target=producer,args=())
c = threading.thread(target=consumer,args=())
p.start()
c.start()

等人來買包子....

chenchao:去買包子....
true
chef:sb is coming for baozi...
chef:****** a baozi for sb...
chenchao:waiting for baozi to be ready...
true
chenchao:哎呀真好吃....
chef:你的包子好了...

方法清除設定的set狀態。

#!/usr/bin python

#coding=utf-8
import threading
import time
defproducer
():print
u'等人來買包子....'
event.wait()
event.clear()
print event.isset()
print
u'chef:sb is coming for baozi...'
print
u'chef:****** a baozi for sb...'
time.sleep(5)
print
u'chef:你的包子好了...'
event.set() 
defconsumer
():print
u'chenchao:去買包子....'
event.set()
time.sleep(2)
print
'chenchao:waiting for baozi to be ready...'
print event.wait()
print
u'chenchao:哎呀真好吃....'
event = threading.event()
p = threading.thread(target=producer,args=())
c = threading.thread(target=consumer,args=())
p.start()
c.start()

等人來買包子....

chenchao:去買包子....
false
chef:sb is coming for baozi...
chef:****** a baozi for sb...
chenchao:waiting for baozi to be ready...
chef:你的包子好了...
true
chenchao:哎呀真好吃....

#!/usr/bin python

#coding=utf-8
import threading
import time
defproducer
():print
u'等人來買包子....'
event.wait()
event.clear()
print event.isset()
print
u'chef:sb is coming for baozi...'
print
u'chef:****** a baozi for sb...'
time.sleep(5)
print
u'chef:你的包子好了...'
event.set() 
defconsumer
():print
u'chenchao:去買包子....'
event.set()
time.sleep(2)
print
'chenchao:waiting for baozi to be ready...'
while
true:
if event.isset():
print
u'真好吃...'
break
else:
print
u'好慢啊...'
time.sleep(1)#相當於去做自己的事去了
event = threading.event()
p = threading.thread(target=producer,args=())
c = threading.thread(target=consumer,args=())
p.start()
c.start()

等人來買包子....

chenchao:去買包子....
false
chef:sb is coming for baozi...
chef:****** a baozi for sb...
chenchao:waiting for baozi to be ready...
好慢啊...
好慢啊...
好慢啊...
好慢啊...chef:你的包子好了...
真好吃...

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