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。