python-Lock进程同步解决互斥

  #!/usr/bin/python
 from multiprocessing import Process,Lock
 import time,sys

 def A(lock):
     with lock:
         for i in range(10):
             time.sleep(2)
             sys.stdout.write("hello world\n")

 def B(lock):
     lock.acquire()
     try:
         for i in range(10):
             time.sleep(2)
             sys.stdout.write("  nihao  a \n")
     finally:
         lock.release()

 lock=Lock()
 m=Process(target=A,args=(lock,))
 n=Process(target=B,args=(lock,))

 m.start()
 n.start()

 m.join()
 n.join()