python创建进程fork用法

时间:2021-11-09 15:48:14

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:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
#!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:

?
1
2
3
4
5
6
7
8
9
10
11
***********************
......
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。