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bpo-32309: Add support for contextvars in asyncio.to_thread() (GH-20278)

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Allows contextvars from the main thread to be accessed in the separate thread used in `asyncio.to_thread()`. See the [discussion](https://github.com/python/cpython/pull/20143GH-discussion_r427808225) in GH-20143 for context.

Automerge-Triggered-By: @aeros
(cherry picked from commit 0f56263e62)

Co-authored-by: Kyle Stanley <aeros167@gmail.com>
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Miss Islington (bot) 2020-05-20 22:38:00 -07:00 • committed by GitHub
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6
Doc/library/asyncio-task.rst
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@ -610,7 +610,9 @@ Running in Threads
Asynchronously run function *func* in a separate thread.
Any \*args and \*\*kwargs supplied for this function are directly passed
to *func*.
to *func*. Also, the current :class:`contextvars.Context` is propogated,
allowing context variables from the event loop thread to be accessed in the
separate thread.
Return an :class:`asyncio.Future` which represents the eventual result of
*func*.
@ -657,6 +659,8 @@ Running in Threads
that release the GIL or alternative Python implementations that don't
have one, `asyncio.to_thread()` can also be used for CPU-bound functions.
.. versionadded:: 3.9
Scheduling From Other Threads
=============================