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Issue34687

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Title:asyncio: is it time to make ProactorEventLoop as the default event loop?
Type:Stage:resolved
Components:asyncioVersions:Python 3.8
process
Status:closedResolution:fixed
Dependencies:Superseder:
Assigned To:Nosy List: asvetlov, carltongibson, miss-islington, vstinner, yselivanov
Priority:normalKeywords:patch

Created on2018-09-14 19:35 byvstinner, last changed2022-04-11 14:59 byadmin. This issue is nowclosed.

Pull Requests
URLStatusLinkedEdit
PR 9538mergedvstinner,2018-09-24 15:03
PR 9623mergedvstinner,2018-09-28 14:49
Messages (9)
msg325391 -(view)Author: STINNER Victor (vstinner)*(Python committer)Date: 2018-09-14 19:35
Is it time to make ProactorEventLoop as the default event loop?Since 2014, many features have been added to ProactorEventLoop (ex: SSL support) and the implementation is way more today than it was 4 years ago.Comparison of SelectorEventLoop and ProactorEventLoop on Windows:https://docs.python.org/dev/library/asyncio-platforms.html#windows
msg325394 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-09-14 20:13
I'm not sure that ProactorEventLoop is stable enough TBH :(  And I wouldn't be able to be on call for Windows users to fix all bugs in ProactieEventLoop.Andrew, your thoughts on this?
msg326361 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-09-25 15:27
New changeset6ea29c5e90dde6c240bd8e0815614b52ac307ea1 by Yury Selivanov (Victor Stinner) in branch 'master':bpo-34687: Make asynico use ProactorEventLoop by default (GH-9538)https://github.com/python/cpython/commit/6ea29c5e90dde6c240bd8e0815614b52ac307ea1
msg326363 -(view)Author: STINNER Victor (vstinner)*(Python committer)Date: 2018-09-25 15:31
Thank you for the review Yury ;-)
msg326424 -(view)Author: Andrew Svetlov (asvetlov)*(Python committer)Date: 2018-09-26 07:40
I think the only way to make sure that proactor event loop is stable -- starting to use it everywhere on Windows.Let's do it.
msg326641 -(view)Author: miss-islington (miss-islington)Date: 2018-09-28 15:40
New changeset37aae9dcf18753b8ffda99d1a5758a90af852464 by Miss Islington (bot) (Victor Stinner) in branch 'master':bpo-34687: Update asyncio doc for ProactorEventLoop (GH-9623)https://github.com/python/cpython/commit/37aae9dcf18753b8ffda99d1a5758a90af852464
msg355210 -(view)Author: Carlton Gibson (carltongibson)Date: 2019-10-23 10:12
This change causes an issue in asgiref (and so Django) for Windows and Python 3.8.https://github.com/django/asgiref/issues/132https://code.djangoproject.com/ticket/30900It looks as if `ProactorEventLoop` needs to check the current thread before triggering the signal... ```File "C:\Jenkins\workspace\django-windows\database\sqlite3\label\windows\python\Python38\.env\lib\site-packages\asgiref\sync.py", line 130, in _run_event_loopFile "C:\Python38\lib\asyncio\proactor_events.py", line 679, in close    signal.set_wakeup_fd(-1)ValueError: set_wakeup_fd only works in main thread```... but I'm not familiar with the internals here as yet. (I'm guessing I need to create a new issue?)
msg355211 -(view)Author: STINNER Victor (vstinner)*(Python committer)Date: 2019-10-23 10:20
> (I'm guessing I need to create a new issue?)Please open a new issue.
msg355215 -(view)Author: Carlton Gibson (carltongibson)Date: 2019-10-23 12:14
Created:https://bugs.python.org/issue38563 Thanks!
History
DateUserActionArgs
2022-04-11 14:59:05adminsetgithub: 78868
2019-10-23 12:14:41carltongibsonsetmessages: +msg355215
2019-10-23 10:20:15vstinnersetmessages: +msg355211
2019-10-23 10:12:12carltongibsonsetnosy: +carltongibson
messages: +msg355210
2018-09-28 15:40:13miss-islingtonsetnosy: +miss-islington
messages: +msg326641
2018-09-28 14:49:05vstinnersetpull_requests: +pull_request9021
2018-09-26 07:40:56asvetlovsetmessages: +msg326424
2018-09-25 15:31:18vstinnersetstatus: open -> closed
resolution: fixed
messages: +msg326363

stage: patch review -> resolved
2018-09-25 15:27:21yselivanovsetmessages: +msg326361
2018-09-24 15:03:14vstinnersetkeywords: +patch
stage: patch review
pull_requests: +pull_request8940
2018-09-14 20:13:31yselivanovsetmessages: +msg325394
2018-09-14 19:35:17vstinnercreate
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