bpo-44117: Remove PyEval_InitThreads() by vstinner · Pull Request #26070 · python/cpython
Remove PyEval_InitThreads() and PyEval_ThreadsInitialized()
functions. The GIL is created by Py_Initialize() since Python 3.7,
and so calling explicitly PyEval_InitThreads() was useless since
Python 3.7. Deprecated in 3.9, PyEval_InitThreads() did nothing and
PyEval_ThreadsInitialized() already returned true.