python中的Lock

 #Lock.py
 from multiprocessing import Process,Lock
 import os

 def f(l,i):
     l.acquire()
     print('hello world %d and Ospid is %s...' %( i,os.getpid()))
     l.release()
 if __name__=='__main__':
     lock = Lock()
     for num in range(10):
         Process(target=f,args=(lock,num)).start()

有Lock。

结果

 hello world 3 and Ospid is 4852...
 hello world 2 and Ospid is 540...
 hello world 0 and Ospid is 4160...
 hello world 1 and Ospid is 948...
 hello world 4 and Ospid is 5272...
 hello world 6 and Ospid is 3100...
 hello world 7 and Ospid is 3364...
 hello world 8 and Ospid is 924...
 hello world 9 and Ospid is 5196...
 hello world 5 and Ospid is 5460...

以下是无Lock

 #copy.py
 __author__ = 'liunnis'
 from multiprocessing import Process,Lock
 import os

 def f(l,i):

     print('hello world %d and Ospid is %s...' %( i,os.getpid()))

 if __name__=='__main__':
     lock = Lock()
     for num in range(10):
        p = Process(target=f,args=(lock,num))
        p.start()
 #       p.join()

结果:

 hello world 3 and Ospid is 944...
 hello world 1 and Ospid is 4156...
 hello world 8 and Ospid is 2136...
 hello world 5 and Ospid is 3764...
 hello world 6 and Ospid is 4876...
 hello world 7 and Ospid is 4976...
 hello world 2 and Ospid is 2640...
 hello world 0 and Ospid is 1404...
 hello world 9 and Ospid is 5748...
 hello world 4 and Ospid is 4032..