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This makes the following APIs public: * `Py_BEGIN_CRITICAL_SECTION_MUTEX(mutex),` * `Py_BEGIN_CRITICAL_SECTION2_MUTEX(mutex1, mutex2)` * `void PyCriticalSection_BeginMutex(PyCriticalSection *c, PyMutex *mutex)` * `void PyCriticalSection2_BeginMutex(PyCriticalSection2 *c, PyMutex *mutex1, PyMutex *mutex2)` The macros are identical to the corresponding `Py_BEGIN_CRITICAL_SECTION` and `Py_BEGIN_CRITICAL_SECTION2` macros (e.g., they include braces), but they accept a `PyMutex` instead of an object. The new macros are still paired with the existing END macros (`Py_END_CRITICAL_SECTION`, `Py_END_CRITICAL_SECTION2`).
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/