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There were a few thread-safety issues when profiling or tracing all threads via PyEval_SetProfileAllThreads or PyEval_SetTraceAllThreads: * The loop over thread states could crash if a thread exits concurrently (in both the free threading and default build) * The modification of `c_profilefunc` and `c_tracefunc` wasn't thread-safe on the free threading build.
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/