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"