[Python-checkins] bpo-44508: [Doc] Document failure mode for loop.call_soon_threadsafe (GH-27688)

[ambv]

https://github.com/python/cpython/commit/3240bc62f4e0afa09964f3afc845697f0a0806b9
commit: 3240bc62f4e0afa09964f3afc845697f0a0806b9
branch: main
author: meowmeowmeowcat <meowmeowcat1211 at gmail.com>
committer: ambv <lukasz at langa.pl>
date: 2021-08-18T00:55:04+02:00
summary:

bpo-44508: [Doc] Document failure mode for loop.call_soon_threadsafe (GH-27688)

Co-authored-by: Łukasz Langa <lukasz at langa.pl>

files:
M Doc/library/asyncio-eventloop.rst

diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 98ec65dde887c..147fb2b9bf603 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -216,6 +216,10 @@ Scheduling callbacks
    A thread-safe variant of :meth:`call_soon`.  Must be used to
    schedule callbacks *from another thread*.
 
+   Raises :exc:`RuntimeError` if called on a loop that's been closed.
+   This can happen on a secondary thread when the main application is
+   shutting down.
+
    See the :ref:`concurrency and multithreading <asyncio-multithreading>`
    section of the documentation.