gh-116322: Add Py_mod_gil module slot #116882
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This PR adds the ability to enable the GIL if it was disabled at interpreter startup, and modifies the multi-phase module initialization path to enable the GIL when loading a module, unless that module's spec includes a slot indicating it can run safely without the GIL.
PEP 703 called the constant for the slot
Py_mod_gil_not_used
; I went withPy_MOD_GIL_NOT_USED
for consistency with gh-104148.A warning will be issued up to once per interpreter for the first GIL-using module that is loaded. If
-v
is given, a shorter message will be printed to stderr every time a GIL-using module is loaded (including the first one that issues a warning).Py_mod_gil
slot for free-threading-safe extensions #116322ð Documentation preview ð: https://cpython-previews--116882.org.readthedocs.build/