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docs: Add notice about WindowsSelectorEventLoop on py38 #2686

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Jun 22, 2019
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docs: Add notice about WindowsSelectorEventLoop on py38 #2686

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7 changes: 7 additions & 0 deletions docs/index.rst
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Expand Up @@ -120,6 +120,13 @@ is limited (Even though Tornado is built on ``asyncio``, which
supports Windows, Tornado does not use the APIs that are necessary for
scalable networking on Windows).

On Windows, Tornado requires the ``WindowsSelectorEventLoop``. This is
the default in Python 3.7 and older, but Python 3.8 defaults to an
event loop that is not compatible with Tornado. Applications that use
Tornado on Windows with Python 3.8 must call
``asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())``
at the beginning of their ``main`` file/function.

Documentation
-------------

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