python多進程打印字符，加鎖（Lock加鎖）

 

先看不加鎖的：

#coding=utf-8
from multiprocessing import Process,Lock
import time

def l(num):
    #lock.acquire()   
    #stime.sleep(2)
    print "Hello num:%s" %num
    #lock.release()

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

 結果：可以看到，啟動10個進程，異步執行打印函數，打印的很亂

c:\Python27\Scripts>python task_test.py
HHello num:0Hello num:1
ello num:2
Hello num:3

HHello num:4ello num:5

Hello num:6
Hello num:7
Hello num:8
Hello num:9

 

 

 

 

 

加鎖：

#coding=utf-8
from multiprocessing import Process,Lock
import time

def l(num,lock):
    lock.acquire()   
    #stime.sleep(2)
    print "Hello num:%s" %num
    lock.release()

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

結果：執行打印的進程獲得鎖，打印后釋放鎖，之后下一個進程獲得鎖，所以每次打印都只有一個進程在操作

 c:\Python27\Scripts>python task_test.py
Hello num:0
Hello num:1
Hello num:3
Hello num:2
Hello num:6
Hello num:5
Hello num:4
Hello num:7
Hello num:8
Hello num:9