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Title: GH-83065: Fix import deadlock by implementing hierarchical module locking by gpshead · Pull Request #137196 · python/cpython · GitHub

Open Graph Title: GH-83065: Fix import deadlock by implementing hierarchical module locking by gpshead · Pull Request #137196 · python/cpython

X Title: GH-83065: Fix import deadlock by implementing hierarchical module locking by gpshead · Pull Request #137196 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: When one thread imports pkg.sub.mod and another thread imports pkg.sub and pkg/sub/__init__.py itself imports pkg.sub.mod, the two threads can acquire the per-module locks in opposite orders and tr...

X Description: When one thread imports pkg.sub.mod and another thread imports pkg.sub and pkg/sub/__init__.py itself imports pkg.sub.mod, the two threads can acquire the per-module locks in opposite orders and tr...

Opengraph URL: https://github.com/python/cpython/pull/137196

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GH-83065: Fix import deadlock by implementing hierarchical module lockinghttps://github.com/python/cpython/pull/137196/commits#top
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Merge upstream/main into gps/import-lock-heirarchy-gh-83065https://github.com/python/cpython/pull/137196/commits/22c3d9e12d8096acd257a7ac6abd642e77023085
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_HierarchicalLockManager: release locks on __enter__ failure; accept partial parent on cyclehttps://github.com/python/cpython/pull/137196/commits/478402345c8342b9aad7b6dce26c8bc4917ef62f
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test_threaded_import: tighten hierarchical test; add cross-package circular testhttps://github.com/python/cpython/pull/137196/commits/fd9da14cdb6067d14af98b3a89353c66dafc284a
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Add NEWS entry and What's New for the gh-83065 import deadlock fixhttps://github.com/python/cpython/pull/137196/commits/12eb777a01ea10fc884712fd27f7dcd93b0b9ba5
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Drop comments that restate adjacent codehttps://github.com/python/cpython/pull/137196/commits/b3d4028e400259a8580e99453acd04511b20c45f
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