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gh-85299: Add note warning about entry point guard for asyncio example #93457

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gvanrossum merged 5 commits into from
Oct 16, 2022
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gh-85299: Add note warning about entry point guard for asyncio example #93457

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97d022e
Add note warning about entry point guard for asyncio example
slateny Jun 3, 2022
16cb255
Add entry guard, clarify note on platform
slateny Oct 15, 2022
0129bdf
Add ref target in multiprocessing
slateny Oct 16, 2022
fd68a5e
Use rewording for multiprocessing
slateny Oct 16, 2022
8ba4b0c
Add missing grave sign
slateny Oct 16, 2022
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Use rewording for multiprocessing 
Co-authored-by: C.A.M. Gerlach <[email protected]>
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@slateny @CAM-Gerlach
slateny and CAM-Gerlach authored Oct 16, 2022
commit fd68a5ea4e9c53261c56002f2366a080f1fa7b30
8 changes: 4 additions & 4 deletions Doc/library/asyncio-eventloop.rst
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Expand Up @@ -1209,10 +1209,10 @@ Executing code in thread or process pools
if __name__ == '__main__':
asyncio.run(main())

Note that on Windows and macOS, the entry point guard may be necessary as the
example would otherwise cause a :exc:`RuntimeError`. For more details, see the
`Safe importing of main module
<https://docs.python.org/3/library/multiprocessing.html#the-spawn-and-forkserver-start-methods>`_.
Note that the entry point guard (``if __name__ == '__main__'``)
is required for option 3 due to the peculiarities of :mod:`multiprocessing`,
which is used by :class:`~concurrent.futures.ProcessPoolExecutor.
See :ref:`Safe importing of main module <multiprocessing-safe-main-import>`.

This method returns a :class:`asyncio.Future` object.

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