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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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11
Lib/test/test_asyncio/test_unix_events.py
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@ -1775,7 +1775,8 @@ class PolicyTests(unittest.TestCase):
def test_child_watcher_replace_mainloop_existing(self):
policy = self.create_policy()
loop = policy.get_event_loop()
loop = policy.new_event_loop()
policy.set_event_loop(loop)
# Explicitly setup SafeChildWatcher,
# default ThreadedChildWatcher has no _loop property
@ -1884,13 +1885,15 @@ class TestFork(unittest.IsolatedAsyncioTestCase):
# child
try:
loop = asyncio.get_event_loop_policy().get_event_loop()
os.write(w, str(id(loop)).encode())
except RuntimeError:
os.write(w, b'NO LOOP')
except:
os.write(w, b'ERROR:' + ascii(sys.exc_info()).encode())
finally:
os._exit(0)
else:
# parent
child_loop = int(os.read(r, 100).decode())
self.assertNotEqual(child_loop, id(loop))
self.assertEqual(os.read(r, 100), b'NO LOOP')
wait_process(pid, exitcode=0)
@hashlib_helper.requires_hashdigest('md5')