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

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Merged
gvanrossum merged 5 commits into from
Oct 16, 2022
Merged

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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8 changes: 7 additions & 1 deletion 8 Doc/library/asyncio-eventloop.rst
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Expand Up @@ -1206,7 +1206,13 @@ Executing code in thread or process pools
pool, cpu_bound)
print('custom process pool', result)

asyncio.run(main())
if __name__ == '__main__':
asyncio.run(main())

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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2 changes: 2 additions & 0 deletions 2 Doc/library/multiprocessing.rst
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Expand Up @@ -2943,6 +2943,8 @@ Global variables
However, global variables which are just module level constants cause no
problems.

.. _multiprocessing-safe-main-import:

Safe importing of main module

Make sure that the main module can be safely imported by a new Python
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