python-Condition 进程同步互斥

  #!/usr/bin/python
 import multiprocessing,time

 def A(cond):
     name=multiprocessing.current_process().name
     print "starting",name
     with cond:
         print "%s is done and next is ready"%name
         cond.notify_all()

 def B(cond):
     name=multiprocessing.current_process().name
     print "starting",name
     with cond:
         cond.wait()
         print "%s running..."%name

 cond=multiprocessing.Condition()
 m=multiprocessing.Process(target=A,args=(cond,))
 n=[multiprocessing.Process(target=B,name="Process2[%d]"%i,args=(cond,)) for i in range(1,3)]
 for i in n:
     i.start()
     time.sleep(2)

 m.start()
 m.join()
 for i in n:
     i.join()