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180d417e9f
Add a fast path to (single-mutex) critical section locking _iff_ the mutex is already held by the currently active, top-most critical section of this thread. This can matter a lot for indirectly recursive critical sections without intervening critical sections.
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/