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gh-146636: abi3t: Define Py_GIL_DISABLED but do not to use it - #148142
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…se it When compiling for abi3t, define Py_GIL_DISABLED, so that users who check it to enable additional locking aren't broken. But also add a test that Python headers themselves don't use Py_GIL_DISABLED -- abi3 and abi3t ought to be the same except the _Py_OPAQUE_PYOBJECT differences. This is done using the GCC-only poison pragma. This did require rewriting some preprocessor conditions, and moving _Py_IsOwnedByCurrentThread & supporting functions to a cpython/ header.
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…honGH-148142) When compiling for abi3t, define Py_GIL_DISABLED, so that users who check it to enable additional locking aren't broken. But also avoid using Py_GIL_DISABLED in Python headers themselves -- abi3 and abi3t ought to be the same except the _Py_OPAQUE_PYOBJECT differences. A check for this is coming in a later PR. It will require rewriting some preprocessor conditions, some of these changes are included in this PR. For _Py_IsOwnedByCurrentThread & supporting functions I opted to move them to a cpython/ header, as they're rather self-contained.
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When compiling for abi3t, define
Py_GIL_DISABLED, so that users who check it to enable additional locking aren't broken.But also add a test that Python headers themselves don't use
Py_GIL_DISABLED, sinceabi3andabi3tought to be the same except the_Py_OPAQUE_PYOBJECTdifferences.This is done using the GCC-only
poisonpragma, which tells the compiler/preprocessor to error if it ever sees the identifier after thepragma.This did require rewriting some preprocessor conditions --
#if defined(Py_LIMITED_API) && defined(Py_GIL_DISABLED)needs to be split into two lines, as the poisoning doesn't honour short-circuiting.For
_Py_IsOwnedByCurrentThread& supporting functions I opted to move them to acpython/header, as they're rather self-contained.