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gh-93453: No longer create an event loop in get_event_loop() (#98440)

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asyncio.get_event_loop() now always return either running event loop or
the result of get_event_loop_policy().get_event_loop() call. The latter
should now raise an RuntimeError if no current event loop was set
instead of creating and setting a new event loop.

It affects also a number of asyncio functions and constructors which
call get_event_loop() implicitly: ensure_future(), shield(), gather(),
etc.

DeprecationWarning is no longer emitted if there is no running event loop but
the current event loop was set.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
This commit is contained in:
Serhiy Storchaka 2022-12-06 19:42:12 +02:00 • committed by GitHub
parent b72014c783
commit fd38a2f0ec
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18 changed files with 114 additions and 251 deletions
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4
Lib/asyncio/streams.py
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@ -125,7 +125,7 @@ class FlowControlMixin(protocols.Protocol):
def __init__(self, loop=None):
if loop is None:
self._loop = events._get_event_loop(stacklevel=4)
self._loop = events.get_event_loop()
else:
self._loop = loop
self._paused = False
@ -404,7 +404,7 @@ class StreamReader:
self._limit = limit
if loop is None:
self._loop = events._get_event_loop()
self._loop = events.get_event_loop()
else:
self._loop = loop
self._buffer = bytearray()