python-Event事件处理进程同步

 #!/usr/bin/python
 from multiprocessing import Process,Event
 import os,time

 def A(e):
     print "block Process :starting"
     e.wait()
     print "event is set >>",e.is_set()

 def B(e,t):
     print "non-block Process :starting"
     e.wait(t)
     print "non-event is set >>",e.is_set()

 e=Event()
 m=Process(target=A,args=(e,))
 m.start()
 n=Process(target=B,args=(e,3))
 n.start()

 print "main process"
 time.sleep(8)
 e.set()
 print "main  is over"