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gh-141671: PyMODINIT_FUNC: apply `__declspec(dllexport)` on Windows

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* Issue: gh-141671

encukou

Implement PEP 793 – PyModExport

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# Feature or enhancement ### Proposal: See [PEP 793](https://peps.python.org/pep-0793/). I'll copy the abstract for reference: > In this PEP, we propose a new entry point for C extension modules, by...

encukou

Use-after-free in `atexit.unregister` via re-entrant `__eq__`

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### What happened? `atexit.unregister` iterates its callback list while comparing each entry. A user-defined `__eq__` that calls `atexit._clear()` frees the list during iteration, so the next comparison dereferences a stale...

jackfromeast

### What happened? Re-entrant `ContextVar.set` during `_PyHamt_Eq` lets `Context.__eq__` replace a context while `hamt_iterator_next` still walks the old HAMT nodes, leaving the iterator with freed storage and producing a use-after-free...

jackfromeast

Fix and test `PyABIInfo_VAR`

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# Bug report ### Bug description: `PyABIInfo_VAR` in `modsupport.h` generates incorrect code because `_PyABIInfo_DEFAULT` has been defined as a function. The parentheses should be removed. ### CPython versions tested on:...

philthompson10

defaultdict.__missing__ has data races

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# Bug report ### Bug description: Ideally, defaultdict would provide atomic "compute and add only if key is absent" behavior. When `__missing__` is called, another thread might insert the key....

nascheme

gh-124153: Add Py_tp_token support to xxlimited module

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## Summary Implement the TODO at line 99-100 in `Modules/xxlimited.c` to add `Py_tp_token` slot support, demonstrating Python 3.14 type checking best practices for Limited C API extension modules. ## Changes...

gpshead

We make the PY_UNWIND monitoring event available as a code-local event to allow trapping on function exit events when an exception bubbles up. This complements the PY_RETURN event by allowing...

P403n1x87

# Bug report ### Bug description: Most importantly, it doesn't call `.close()` on it, which blocks GH-140288 and causes surprising warnings on Windows (see GH-141262). Ideally, we'd employ `asyncio.Runner` to...

johnslavik

Crash `msgspec` with Python 3.13.*

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# Bug report ### Bug description: The original problem - https://github.com/jcrist/msgspec/pull/960 In Python 3.13 `PyObject_GC_New` does not do initialization inline values (aka `_PyObject_InitInlineValues`). In Python 3.14 `PyObject_GC_New` does initialization inline...

shadchin