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This is a follow up to Call Python from C++ At the startup of the programm I call the following function to initialize the interpreter: void initPython(){ PyEval_InitThreads(); Py_Initialize(); PyEval_ReleaseLock(); } Every thread creates it's own data structure and acquires the lock with: PyGILState_STATE gstate; gstate = PyGILState_Ensure(); //call python API, process results PyGILState_Release(gstate); Rather straight forward once you understood the GIL, but the problem is that I get a segfault when calling Py_Finalize(). void exitPython(){ PyEval_AcquireLock(); Py_Finalize(); } The reference is rather dubious about Py_Finalize() (or maybe I'm just reading it the wrong way) and I'm not sure if PyEval_AcquireLock() can acquire the lock if there are some active threads and what happens if there are active threads when Py_Finalize() is called. Anyways, I get a segfault even if I'm sure that all threads have finished their work, but only if at least one was created. E.g. calling initPython() followed from exitPython() creates no error. I could just ignore the problem and hope the OS knows what it does, but I'd prefere if I could figure out what is going on..

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