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()