PyEval_InitThreads in Python 3: How/when to call it? (the saga continues ad nauseam)

Question

Basically there seems to be massive confusion/ambiguity over when exactly PyEval_InitThreads() is supposed to be called, and what accompanying API

Answer 1

The suggestion to call PyEval_SaveThread works

PyEval_InitThreads();
PyThreadState* st = PyEval_SaveThread();

However to prevent crash when module is imported, ensure Python APIs to import are protected using

PyGILState_Ensure and PyGILState_Release

e.g.

PyGILState_STATE gstate = PyGILState_Ensure();
PyObject *pyModule_p = PyImport_Import(pyModuleName_p);
PyGILState_Release(gstate);