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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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6
Lib/asyncio/tasks.py
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@ -582,7 +582,7 @@ def as_completed(fs, *, timeout=None):
from .queues import Queue # Import here to avoid circular import problem.
done = Queue()
loop = events._get_event_loop()
loop = events.get_event_loop()
todo = {ensure_future(f, loop=loop) for f in set(fs)}
timeout_handle = None
@ -668,7 +668,7 @@ def _ensure_future(coro_or_future, *, loop=None):
'is required')
if loop is None:
loop = events._get_event_loop(stacklevel=4)
loop = events.get_event_loop()
try:
return loop.create_task(coro_or_future)
except RuntimeError:
@ -749,7 +749,7 @@ def gather(*coros_or_futures, return_exceptions=False):
gather won't cancel any other awaitables.
"""
if not coros_or_futures:
loop = events._get_event_loop()
loop = events.get_event_loop()
outer = loop.create_future()
outer.set_result([])
return outer