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TypedPython: a compiled module re-enables the GIL on a free-threaded build #159
Description
tp_runtime.h declares no Py_mod_gil slot, so importing any compiled module into 3.14t makes CPython re-enable the GIL for the whole process (its own comment says so: tp_globals_epoch and class caches rely on GIL serialisation). Parallelism (AGENTS §12.8, #151) silently disappears.
Work: make the runtime safe without the GIL (atomic epoch, per-module state, Py_BEGIN_CRITICAL_SECTION around array copy-in and write-back; decide #152 together), then declare Py_MOD_GIL_NOT_USED.
Completion: a test that fails today: on desktop 3.14t, import a compiled module and assert sys._is_gil_enabled() is False; plus the existing suite green on 3.14t. Depends on the decision in the free-threaded readiness issue.
Activity
b-re-w commentedon Oct 3, 2026
Scope added (leader decision, 2026-10-04):
tp_poll_countdown,tp_snapshot_depth) becomes per thread.Py_BEGIN_CRITICAL_SECTION2for two; a fixed order beyond that).Merge pull request #209 from thisisthepy/feat/tp-free-threaded
b-re-w commentedon Oct 17, 2026
Landed in develop via #209.