[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Change by Roundup Robot : -- pull_requests: +6550 ___ Python tracker ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Change by Gregory P. Smith : -- versions: +Python 3.8 -Python 3.7 ___ Python tracker ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Changes by Gregory P. Smith : -- assignee: -> gregory.p.smith ___ Python tracker ___ ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Antoine Pitrou added the comment: By the way, we're using GitHub PRs now for development, though you can still submit patch files if you prefer that. -- nosy: +pitrou ___ Python tracker

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Changes by Antoine Pitrou : -- nosy: +gregory.p.smith ___ Python tracker ___ ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Changes by Antoine Pitrou : -- stage: -> patch review ___ Python tracker ___ ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Martin Richard added the comment: Yes, the goal is to isolate the blocking IO in __init__ into other methods so Popen can be subclassed in asyncio. The end goal is to ensure that when asyncio calls Popen(), it doesn't block the process. In the context of asyncio, there's no need to make

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Giampaolo Rodola' added the comment: Is the main goal to just make Popen.__init__ non-blocking? If not, #1191964 aims at providing non-blocking reads/writes (including on Windows). -- nosy: +giampaolo.rodola ___ Python tracker

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Changes by Terry J. Reedy : -- versions: +Python 3.7 -Python 3.6 ___ Python tracker ___ ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

Changes by Terry J. Reedy : -- nosy: +yselivanov ___ Python tracker ___ ___

[issue28287] Refactor subprocess.Popen to let a subclass handle IO asynchronously

New submission from Martin Richard: Hi, Currently, subprocess.Popen performs blocking IO in its constructor (at least on Unix): it reads on a pipe in order to detect outcome of the pre-exec and exec phase in the new child. There is no way yet to modify this behavior as this blocking call is