René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Support for free-threaded CPython (3.14t or newer)","articleBody":"This issue is intended to track the efforts of adding support for the free-threaded build for CPython (3.14t and potentially 3.13t).  The [Python free-threading guide](https://py-free-threading.github.io/porting/) contains some helpful advice on approaching this task.  Based on  what has been done for pybind11, I think the following steps make sense:\n\n- Add mechanism to set the `Py_MOD_GIL_NOT_USED`.  I have a patch that does something similar to what pybind11 does: add a variadic macro with an optional flag so extensions can opt-in to free-threaded support\n- Replace borrow based APIs with strong reference ones (e.g. `PyDict_GetItemRef`)\n- Use a mutex to protect global state (e.g. the registry)\n- Fix references to `ob_refcnt`, don't use `Py_REFCNT()` as an l-value.\n- Modify tests so we can run them in parallel, run with the TSAN build to find races\n- Fixes to \"faber\" to work with new versions of Python.  The most recent release of faber fixes most things, I believe.\n\nI have code that does most of this, I will create a PR.  I'm still working on some crash bugs when running with 3.14t.  If you run the Boost.Python tests with a single thread, they pass.  So that's encouraging.\n\nRelated issues:\n- https://github.com/boostorg/python/issues/458\n\nRelated PRs:\n- https://github.com/boostorg/python/pull/504","author":{"url":"https://github.com/nascheme","@type":"Person","name":"nascheme"},"datePublished":"2025-10-29T18:22:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/503/python/issues/503"}