python中的Lock
1 #Lock.py 2 from multiprocessing import Process,Lock 3 import os 4 5 def f(l,i): 6 l.acquire() 7 print('hello world %d and Ospid is %s...' %( i,os.getpid())) 8 l.release() 9 if __name__=='__main__': 10 lock = Lock() 11 for num in range(10): 12 Process(target=f,args=(lock,num)).start()
有Lock。
结果
1 hello world 3 and Ospid is 4852... 2 hello world 2 and Ospid is 540... 3 hello world 0 and Ospid is 4160... 4 hello world 1 and Ospid is 948... 5 hello world 4 and Ospid is 5272... 6 hello world 6 and Ospid is 3100... 7 hello world 7 and Ospid is 3364... 8 hello world 8 and Ospid is 924... 9 hello world 9 and Ospid is 5196... 10 hello world 5 and Ospid is 5460...
以下是无Lock
1 #copy.py 2 __author__ = 'liunnis' 3 from multiprocessing import Process,Lock 4 import os 5 6 def f(l,i): 7 8 print('hello world %d and Ospid is %s...' %( i,os.getpid())) 9 10 if __name__=='__main__': 11 lock = Lock() 12 for num in range(10): 13 p = Process(target=f,args=(lock,num)) 14 p.start() 15 # p.join()
结果:
1 hello world 3 and Ospid is 944... 2 hello world 1 and Ospid is 4156... 3 hello world 8 and Ospid is 2136... 4 hello world 5 and Ospid is 3764... 5 hello world 6 and Ospid is 4876... 6 hello world 7 and Ospid is 4976... 7 hello world 2 and Ospid is 2640... 8 hello world 0 and Ospid is 1404... 9 hello world 9 and Ospid is 5748... 10 hello world 4 and Ospid is 4032..
