[issue40811] Allow to create new Event Loops on Threads

[Andrew Svetlov]

Andrew Svetlov  added the comment:

I suggest closing.
The documentation explicitly describes how asyncio works with threads.

--
resolution:  -> wont fix
stage: patch review -> resolved
status: open -> closed

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[issue40811] Allow to create new Event Loops on Threads

[Irit Katriel]

Irit Katriel  added the comment:

Should this be closed as rejected or is there further discussion?

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nosy: +iritkatriel

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[issue40811] Allow to create new Event Loops on Threads

[Christian Heimes]

Christian Heimes  added the comment:

The default policy of asyncio deliberately limits automatic creation of event 
loops to the main thread. You can't just mix asyncio with a threaded web 
application and expect it to work correctly.

See 
https://github.com/python/cpython/blob/a487a39dca4c41305928c7dfdbcb0b3aa344683b/Lib/asyncio/events.py#L609-L620

In this policy, each thread has its own event loop.  However, we
only automatically create an event loop by default for the main
thread; other threads by default have no event loop.

Other policies may have different rules (e.g. a single global
event loop, or automatically creating an event loop per thread, or
using some other notion of context to which an event loop is
associated).

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nosy: +christian.heimes

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[issue40811] Allow to create new Event Loops on Threads

[Roundup Robot]

Change by Roundup Robot :


--
keywords: +patch
nosy: +python-dev
nosy_count: 3.0 -> 4.0
pull_requests: +19748
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20500

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[issue40811] Allow to create new Event Loops on Threads

[Christian Exposito]

New submission from Christian Exposito :

Right now, Async IO module is not automatically creating a new event loop on 
threads that are not the main thread 
(https://github.com/python/cpython/blob/master/Lib/asyncio/events.py#L638), but 
it should be interesting to do it. For example, WSGI applications handle web 
requests by spawning a new thread. If we allow Async IO module to create event 
loops on those threads, we will improve its adoption for developing web 
applications.

--
components: asyncio
messages: 370257
nosy: Christian Exposito, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Allow to create new Event Loops on Threads
type: behavior
versions: Python 3.10

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