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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
with `Py_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).
This commit is contained in:
Brett Simmers 2024-05-03 08:30:55 -07:00 • committed by GitHub
parent 3e818afb9b
commit c2627d6eea
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123 changed files with 376 additions and 62 deletions
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3
Python/sysmodule.c
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@ -3756,6 +3756,9 @@ _PySys_Create(PyThreadState *tstate, PyObject **sysmod_p)
if (sysmod == NULL) {
return _PyStatus_ERR("failed to create a module object");
}
#ifdef Py_GIL_DISABLED
PyModule_ExperimentalSetGIL(sysmod, Py_MOD_GIL_NOT_USED);
#endif
PyObject *sysdict = PyModule_GetDict(sysmod);
if (sysdict == NULL) {