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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Allow C extensions to declare compatibility with free-threading","articleBody":"# Feature or enhancement\r\n\r\nThere are a few pieces to this:\r\n1. Add a `Py_mod_gil` slot, as [described in PEP 703](https://peps.python.org/pep-0703/#py-mod-gil-slot), that multi-phase init modules can use to indicate that they support free-threading.\r\n2. Add a `PyModule_ExperimentalSetGIL()` function (discussed [here](https://github.com/python/cpython/pull/116882#discussion_r1575006053)) that single-phase init modules can use in place of `Py_mod_gil`.\r\n3. Mark all built-in modules as free-threading compatible with one of the above mechanisms.\r\n4. Enable the GIL while loading a C module and leave it permanently enabled if the module does not declare free-threading compatibility.\r\n\r\n1-3 are addressed in gh-116882; 4 will be addressed in a separate PR.\r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-116882\r\n* gh-118560\n* gh-118645\n* gh-122268\n* gh-122282\n* gh-122284\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/swtaarrs","@type":"Person","name":"swtaarrs"},"datePublished":"2024-03-04T19:26:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/116322/cpython/issues/116322"}