python创建进程fork用法

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。

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn