I feel this. Signal handling in Python code is especially complicated. I'm not even talking about multithreading here (not like you get anything out of it anyway).

Python registers POSIX signal handlers, that upon SIGTERM/SIGINT, set a flag. Next time the interpreter loop runs, the flag is checked before the next instruction is being run and the stack is unwinded.

When you call out to some C code, that C code may run for a long time. During that time, there is no interpreter loop actually looping. Therefore, all signals are ignored in principle while C code runs.

It's possible for Python code to become uninterruptible while it is calling something like pthread_join.

See https://stackoverflow.com/questions/39930722/how-do-i-catch-...

Then of course, you have that on top of all the other problems mentioned by the blogpost.