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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PyCell_GET/SET are not thread-safe in free-threaded builds","articleBody":"# Bug report\n\n### Bug description:\n\nThe `PyCell_GET` and `PyCell_SET` macros are not safe for free-threading builds.  First, they don't the correct locking.  Second, `PyCell_GET` returns a borrowed reference.\n\nFor CPython internals, the usages of these macros can be replaced (either with `PyCell_GetRef()`, `PyCell_SetTakeRef()`, or similar).  For external API users, these macros will need to be marked as deprecated, at least for free-threaded builds.\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-127272\n* gh-130383\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/nascheme","@type":"Person","name":"nascheme"},"datePublished":"2024-11-25T21:58:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/127271/cpython/issues/127271"}