python-Event事件线程同步和互斥

 #!/usr/bin/python
#coding=utf-8
#用于线程间通信，通过事件标识控制
import threading
from time import sleep,ctime

def A():
    print "A is starting"
    event_is_set=e.wait()
    print "event set1:%s"%event_is_set

def B(e,t):
    while not e.isSet():
        print "wait for event timeout starting"
        event_is_set=e.wait(t)
        print "event set2:%s"%event_is_set
        if event_is_set:
            print "event process"
        else:
            print "do other work"

e=threading.Event() 
t1=threading.Thread(target=A)
t1.start()
t2=threading.Thread(target=B,args=(e,4))
t2.start()

print "waiting before calling event set"
sleep(5)
e.set()
print "event is set"