8000 bpo-33792: Add selector and proactor windows policies (GH-7487) · python/cpython@0738443 · GitHub
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bpo-33792: Add selector and proactor windows policies (GH-7487)
(cherry picked from commit 8f40429) Co-authored-by: Yury Selivanov <yury@magic.io>
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-3
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‎Doc/whatsnew/3.7.rst

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@@ -733,6 +733,10 @@ include:
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* Exceptions occurring in cancelled tasks are no longer logged.
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(Contributed by Yury Selivanov in :issue:`30508`.)
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* New ``WindowsSelectorEventLoopPolicy`` and
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``WindowsProactorEventLoopPolicy`` classes.
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(Contributed by Yury Selivanov in :issue:`33792`.)
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Several ``asyncio`` APIs have been
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:ref:`deprecated <whatsnew37-asyncio-deprecated>`.
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‎Lib/asyncio/windows_events.py

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@@ -21,7 +21,8 @@
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__all__ = (
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'SelectorEventLoop', 'ProactorEventLoop', 'IocpProactor',
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'DefaultEventLoopPolicy',
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'DefaultEventLoopPolicy', 'WindowsSelectorEventLoopPolicy',
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'WindowsProactorEventLoopPolicy',
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)
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@@ -801,8 +802,12 @@ def callback(f):
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SelectorEventLoop = _WindowsSelectorEventLoop
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class _WindowsDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
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class WindowsSelectorEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
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_loop_factory = SelectorEventLoop
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DefaultEventLoopPolicy = _WindowsDefaultEventLoopPolicy
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class WindowsProactorEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
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_loop_factory = ProactorEventLoop
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DefaultEventLoopPolicy = WindowsSelectorEventLoopPolicy

‎Lib/test/test_asyncio/test_windows_events.py

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@@ -162,5 +162,36 @@ def test_wait_for_handle_cancel(self):
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fut.cancel()
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class WinPolicyTests(test_utils.TestCase):
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def test_selector_win_policy(self):
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async def main():
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self.assertIsInstance(
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asyncio.get_running_loop(),
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asyncio.SelectorEventLoop)
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old_policy = asyncio.get_event_loop_policy()
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try:
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asyncio.set_event_loop_policy(
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asyncio.WindowsSelectorEventLoopPolicy())
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asyncio.run(main())
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finally:
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asyncio.set_event_loop_policy(old_policy)
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def test_proactor_win_policy(self):
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async def main():
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self.assertIsInstance(
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asyncio.get_running_loop(),
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asyncio.ProactorEventLoop)
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old_policy = asyncio.get_event_loop_policy()
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try:
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asyncio.set_event_loop_policy(
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asyncio.WindowsProactorEventLoopPolicy())
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asyncio.run(main())
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finally:
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asyncio.set_event_loop_policy(old_policy)
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if __name__ == '__main__':
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unittest.main()

‎Misc/NEWS.d/next/Library/2018-06-07-12-38-12.bpo-33792.3aKG7u.rst

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Add asyncio.WindowsSelectorEventLoopPolicy and
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asyncio.WindowsProactorEventLoopPolicy.

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