1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
# Copyright 2014 Open Source Robotics Foundation, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import threading
import warnings
_thread_local = threading.local()
def get_loop_impl(asyncio):
# See the note in
# https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.get_event_loop # noqa
# In short, between Python 3.10.0 and 3.10.8, this unconditionally raises a
# DeprecationWarning. But after 3.10.8, it only raises the warning if
# ther eis no current loop set in the policy. Since we are setting a loop
# in the policy, this warning is spurious, and will go away once we get
# away from Python 3.10.6 (verified with Python 3.11.3).
with warnings.catch_warnings():
warnings.filterwarnings(
'ignore',
'There is no current event loop',
DeprecationWarning)
global _thread_local
if getattr(_thread_local, 'loop_has_been_setup', False):
return asyncio.get_event_loop()
# Setup this thread's loop and return it
if os.name == 'nt':
try:
loop = asyncio.get_event_loop()
if not isinstance(loop, asyncio.ProactorEventLoop):
# Before replacing the existing loop, explicitly
# close it to prevent an implicit close during
# garbage collection, which may or may not be a
# problem depending on the loop implementation.
loop.close()
loop = asyncio.ProactorEventLoop()
asyncio.set_event_loop(loop)
except (RuntimeError, AssertionError):
loop = asyncio.ProactorEventLoop()
asyncio.set_event_loop(loop)
else:
try:
loop = asyncio.get_event_loop()
except (RuntimeError, AssertionError):
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
_thread_local.loop_has_been_setup = True
return loop
|
