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GeezerVison is showing github.com — gh-112087: Make `list.extend(dict)` behave atomically by colesbury · Pull Request #117438 · python/cpython

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@colesbury

@colesbury colesbury commented Apr 1, 2024 •
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Add a special case for list.extend(dict) and list(dict) so that those patterns behave atomically with respect to modifications to the list or dictionary when the GIL is disabled.

This is required by multiprocessing, which assumes that list(_finalizer_registry) is atomic.

  • Issue: Make list objects thread-safe in --disable-gil builds #112087

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@colesbury
pythongh-112087: Make list.extend(dict) behave atomically
a1fa3fb
Add a special case for `list.extend(dict)` and `list(dict)` so that
those patterns behave atomically with respect to modifications to the
list or dictionary.

This is required by multiprocessing, which assumes that
`list(_finalizer_registry)` is atomic.
@colesbury colesbury added skip news topic-free-threading labels Apr 1, 2024
@colesbury
colesbury requested review from DinoV and corona10 April 1, 2024 22:50
@bedevere-app bedevere-app Bot mentioned this pull request Apr 1, 2024
Make list objects thread-safe in --disable-gil builds #112087
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4 tasks done
@bedevere-app bedevere-app Bot added the awaiting core review label Apr 1, 2024
@colesbury colesbury mentioned this pull request Apr 1, 2024
Disable GIL by default in free-threaded build #116749
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corona10
corona10 approved these changes Apr 2, 2024
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lgtm.

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Apr 2, 2024
@colesbury
colesbury merged commit 027fa2e into python:main Apr 2, 2024
@colesbury
colesbury deleted the gh-112087-dict branch April 2, 2024 14:45
@bedevere-app bedevere-app Bot removed the awaiting merge label Apr 2, 2024
diegorusso pushed a commit to diegorusso/cpython that referenced this pull request Apr 17, 2024
@colesbury @diegorusso
pythongh-112087: Make list.extend(dict) behave atomically (python#1…
363da51
…17438)

Add a special case for `list.extend(dict)` and `list(dict)` so that those
patterns behave atomically with respect to modifications to the list or
dictionary.

This is required by multiprocessing, which assumes that
`list(_finalizer_registry)` is atomic.
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@corona10 corona10 corona10 approved these changes
@DinoV DinoV Awaiting requested review from DinoV

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@colesbury @corona10
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