How to write multithreading for your kernel?

Question

C++ / C#

I need to somehow implement multithreading in the UEFI kernel after it calls Exitbootservices(). I was given an example (article) but it was talking about pseudo-multithreading, i.e. dividing the function into parts and executing them in pieces one after another (all this was done for a single-core processor), but I need multithreading for modern PCs, which could quickly execute my functions