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The `free_work_item()` function in QSBR may call arbitrary code via Python object destructors, which may reenter the QSBR code. Reorder the processing of work items to be robust to reentrancy. Also fix the TODO for the out of memory situation.
The Python C API ================ The C API is divided into these sections: 1. ``Include/``: Limited API 2. ``Include/cpython/``: CPython implementation details 3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can change between minor releases 4. ``Include/internal/``, and any name with ``_`` prefix: The internal API Information on changing the C API is available `in the developer guide`_ .. _in the developer guide: https://devguide.python.org/c-api/