Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #68727

Re: Implement multiprocessing without inheriting parent file handle

Show all headers | View raw

On Sat, Mar 22, 2014 at 5:16 AM, Mark H Harris <harrismh777@gmail.com> wrote:
> On 3/21/14 12:42 PM, Marko Rauhamaa wrote:
>>
>>    http://docs.python.org/3/library/subprocess.html#popen-constructor>
>
>
>> It's got the optional close_fds parameter, which is True by default.
>
>
>> IOW, you don't need to do anything if you use subprocess.Popen() to
>> start your child process. Incidentally, that's the preferred way.
>
>
> hi Marko, of course this depends on the environment; if unix-like, then yes,
> elif windows well, not so much...
>
> There are caveats about stdin, stdout, and stderr;  as well, there are
> caveats about passing fds between the two. Well, Popen() is implemented on
> unix and windows differently, so there is some study needed here if code is
> going to be run in both environments.

There were some recent changes, though, including making CLOEXEC the
default, which means that fork/exec on Unix will retain only the fds
you actually want.

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Implement multiprocessing without inheriting parent file handle Antony Joseph <antonyjoseph89@gmail.com> - 2014-03-21 20:58 +0530
  Re: Implement multiprocessing without inheriting parent file handle Mark H Harris <harrismh777@gmail.com> - 2014-03-21 12:25 -0500
  Re: Implement multiprocessing without inheriting parent file handle Grant Edwards <invalid@invalid.invalid> - 2014-03-21 17:37 +0000
  Re: Implement multiprocessing without inheriting parent file handle Marko Rauhamaa <marko@pacujo.net> - 2014-03-21 19:42 +0200
    Re: Implement multiprocessing without inheriting parent file handle Mark H Harris <harrismh777@gmail.com> - 2014-03-21 13:16 -0500
      Re: Implement multiprocessing without inheriting parent file handle Chris Angelico <rosuav@gmail.com> - 2014-03-22 09:50 +1100

csiph-web