python实现在每个独立进程中运行一个函数的方法_Python

本文实例讲述了python实现在每个独立进程中运行一个函数的方法。分享给大家供大家参考。具体分析如下：

这个简单的函数可以同于在单独的进程中运行另外一个函数，这对于释放内存资源非常有用

				?

									#!/usr/bin/env python

									from __future__ import with_statement

									import os, cPickle

									def run_in_separate_process(func, *args, **kwds):

									  pread, pwrite = os.pipe()

									  pid = os.fork()

									  if pid > 0:

									    os.close(pwrite)

									    with os.fdopen(pread, 'rb') as f:

									      status, result = cPickle.load(f)

									    os.waitpid(pid, 0)

									    if status == 0:

									      return result

									    else:

									      raise result

									  else: 

									    os.close(pread)

									    try:

									      result = func(*args, **kwds)

									      status = 0

									    except Exception, exc:

									      result = exc

									      status = 1

									    with os.fdopen(pwrite, 'wb') as f:

									      try:

									        cPickle.dump((status,result), f, cPickle.HIGHEST_PROTOCOL)

									      except cPickle.PicklingError, exc:

									        cPickle.dump((2,exc), f, cPickle.HIGHEST_PROTOCOL)

									    os._exit(0)

									#an example of use

									def treble(x):

									  return 3 * x

									def main():

									  #calling directly

									  print treble(4)

									  #calling in separate process

									  print run_in_separate_process(treble, 4)

希望本文所述对大家的Python程序设计有所帮助。

python实现在每个独立进程中运行一个函数的方法

相关文章

热门资讯