python线程通信之event

超酷小

http://blog.sina.com.cn/s/blog_4b5039210100exlg.html
个人感觉这个好像是线程同步用的，如果想要通信的话直接传变量也是可以的


<wbr><wbr><wbr>Python提供了Event对象用于线程间通信，它是由线程设置的信号标志，如果信号标志位真，则其他线程等待直到信号接触。</wbr></wbr></wbr>
<wbr><wbr>Event对象实现了简单的线程通信机制，它提供了设置信号，清楚信号，等待等用于实现线程间的通信。</wbr></wbr>
<wbr><wbr>1 设置信号</wbr></wbr>
<wbr><wbr><wbr>使用Event的set（）方法可以设置Event对象内部的信号标志为真。Event对象提供了isSet（）方法来判断其内部信号标志的状态。当使用event对象的set（）方法后，isSet（）方法返回真</wbr></wbr></wbr>
<wbr><wbr>2 清除信号</wbr></wbr>
<wbr><wbr>使用Event对象的clear（）方法可以清除Event对象内部的信号标志，即将其设为假，当使用Event的clear方法后，isSet()方法返回假</wbr></wbr>
<wbr><wbr>3 等待</wbr></wbr>
<wbr><wbr>Event对象wait的方法只有在内部信号为真的时候才会很快的执行并完成返回。当Event对象的内部信号标志位假时，则wait方法一直等待到其为真时才返回。</wbr></wbr>
<wbr></wbr>
下面看个例子
import threading
<wbr></wbr>
class mythread(threading.Thread):
<wbr><wbr><wbr>def __init__(self,threadname):</wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr>threading.Thread.__init__(self,name=threadname)</wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr>def run(self):</wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr>global event</wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr>if event.isSet():</wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>event.clear()</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>event.wait()</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>print self.getName()</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr>else:</wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>print self.getName()</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>event.set()</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
event=threading.Event()
event.set()
t1=[]
for i in range(10):
<wbr><wbr><wbr>t=mythread(str(i))</wbr></wbr></wbr>
<wbr><wbr><wbr>t1.append(t)</wbr></wbr></wbr>
<wbr></wbr>
for i in t1:
<wbr><wbr><wbr>i.start()</wbr></wbr></wbr>
<wbr><wbr></wbr></wbr>
运行的结果为：
>>>
1
0
3
2
5
4
7
6
9
8
>>>