Le mer. 10 mai 2023 à 13:45, luigi scarso <luigi.scarso@gmail.com> a écrit :

Indeed, it's a very specialized subject, one needs to manage C and Lua quite well  --  and the code is not portable,  it's still  somewhat experimental (in lua) and it's quite easy to break luatex.

It's definitively for dedicated applications.

You can see https://luajit.org, the FFI sections.

Thanks, Luigi.

But FFI has been popularized quite a few thanks to Henri Menke (see https://tug.org/TUGboat/tb39-1/tb121menke-ffi.pdf or some FFI Q&A at tex.stackexchange.com). Maybe it is worth adding a few words about it (including the fact that it is still experimental and not portable)?