本文实例讲述了python创建进程fork用法。分享给大家供大家参考。具体分析如下:
#!coding=utf-8
import os ,traceback
import time
'''
fork()系统调用是Unix下以自身进程创建子进程的系统调用,
一次调用,两次返回,如果返回是0,
则是子进程,如果返回值>0,则是父进程(返回值是子进程的pid)
'''
source = 10
i = 0
try:
print '***********************'
pid = os.fork()
#这里会返回两次,所以下面的省略号会输出2次
print '......'
if pid == 0:#子进程
print "this is child process"
source = source - 1
print 'child process source is ',source
time.sleep(10)
print 'child sleep done'
else: #父进程
print "this is parent process"
print 'parent process source is ',source
time.sleep(10)
print 'parent sleep done'
print source
except:
traceback.print_exc()
输出如下:
***********************
......
this is child process
child process source is 9
......
this is parent process
parent process source is 10
child sleep done
9
parent sleep done
10
希望本文所述对大家的Python程序设计有所帮助。
Copyright© 2013-2020
All Rights Reserved 京ICP备2023019179号-8