[Python-Dev] suggest: nowait option in subprocess.communicate (original) (raw)

Josiah Carlson jcarlson at uci.edu
Wed Apr 5 21:39:15 CEST 2006

Neal Becker <ndbecker2 at gmail.com> wrote:

I'd like to start several processes, each a pipe reading from my python main process. It looks like I want to write all my data to each process, then use communicate(), but I don't want to wait for each process yet, since then they would block each other. Why not add a nowait option to communicate?

Alternatively, someone could commit some rough equivalent of this to the subprocess module: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440554

Yes, I wrote it, and previously suggested it within the previous thread "Add timeout to subprocess.py?". Guido had previously privately asked if it could be phased as a patch to subprocess.py in such a way to be 2.2 compatible.

Aside from fcntl module semantics (I don't know if they changed, whether it should be using FCNTL instead, ...), and/or the 3 additional functions from pywin32 that probably should be included in the _subprocess module on Windows, the core functionality of a pollable subprocess is available in the above recipe.

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