There were likely posted elsewhere but I’ll post them here again:
Python free-threading guide: this is a good place to start!
Howto for Python free-threading support
Howto for C API Extension support for free-threading
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The current state of free-threading support in Cython is summarised here together with some opinionated suggestions. Currently that needs the Cython 3.1 pre-release version, but hopefully the actual release isn’t too far off.
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