help with callback from C dll

Thanks for your help,

I have a dynamic library from a commercial company and I'm porting it to
Python to be used from within my own scripts. I'm using ctypes to do so.

The library requires me to send it a function to be used as a callback.
Everything else works fine, except when this callback gets called: I'm
consistently getting bus errors.

I'm guessing that it's because their C code is initiating threads, and the
normal procedure is to reinstate the GIL and then call the callback? And to
do that, you need to do so in C.

Does this mean that I have to write a wrapper over top of the dynamic
library in order to get this working in Python?

Please tell me there's another way!

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