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gh-111962: Make dtoa thread-safe in --disable-gil builds. (#112049)

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This updates `dtoa.c` to avoid using the Bigint free-list in --disable-gil builds and
to pre-computes the needed powers of 5 during interpreter initialization.

* gh-111962: Make dtoa thread-safe in `--disable-gil` builds.

This avoids using the Bigint free-list in `--disable-gil` builds
and pre-computes the needed powers of 5 during interpreter initialization.

* Fix size of cached powers of 5 array.

We need the powers of 5 up to 5**512 because we only jump straight to
underflow when the exponent is less than -512 (or larger than 308).

* Rename Py_NOGIL to Py_GIL_DISABLED

* Changes from review

* Fix assertion placement
This commit is contained in:
Sam Gross 2023-12-07 08:47:55 -05:00 • committed by GitHub
parent 9f67042f28
commit 2d76be251d
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3 changed files with 70 additions and 30 deletions
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6
Python/pylifecycle.c
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@ -820,6 +820,11 @@ pycore_interp_init(PyThreadState *tstate)
return status;
}
status = _PyDtoa_Init(interp);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
// The GC must be initialized before the first GC collection.
status = _PyGC_Init(interp);
if (_PyStatus_EXCEPTION(status)) {
@ -1776,6 +1781,7 @@ finalize_interp_clear(PyThreadState *tstate)
_PyXI_Fini(tstate->interp);
_PyExc_ClearExceptionGroupType(tstate->interp);
_Py_clear_generic_types(tstate->interp);
_PyDtoa_Fini(tstate->interp);
/* Clear interpreter state and all thread states */
_PyInterpreterState_Clear(tstate);