python 创建进程fork
#!coding=utf-8import 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：
***********************
......
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
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