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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Make `_struct` module thread-safe in `--disable-gil` builds","articleBody":"# Feature or enhancement\r\n\r\nThe `_struct` module has a few small issues:\r\n\r\n* The use of `PyDict_GetItemWithError` returns a borrowed reference (should use `PyDict_GetItemRef`)\r\n* The `state-\u003ecache` is lazily created; we should instead create it during `_structmodule_exec`\r\n* We want `state-\u003ecache` to be an immutable reference to a mutable dict. (The `dict` will be thread-safe.) Use `PyDict_Clear` to empty the dict instead of clearing the reference.\r\n\r\n\r\nSee the commit from the `nogil-3.12` fork for context: https://github.com/colesbury/nogil-3.12/commit/ada9b73feb. Note that in CPython the relevant function is `PyDict_GetItemRef` not `PyDict_FetchItemWithError`.\r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-112094\r\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2023-11-14T16:45:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/112062/cpython/issues/112062"}