Multithreading with Python and C api

Question

I have a C++ program that uses the C api to use a Python library of mine. Both the Python library AND the C++ code are multithreaded.

In particular, one th

Answer 1

You probably do not unlock the Global Interpreter Lock when you callback from python's threading.Thread.

Well, if you are using bare python's C API you have some documentation here, about how to release/acquire the GIL. But while using C++, I must warn you that it might broke down upon any exceptions throwing in your C++ code. See here.

In general any of your C++ function that runs for too long should unlock GIL and lock, whenever it use the C Python API again.