FreeBSD Kernel Analysis

[Neeku Shamekhi]

Dear Sir,

I need some help with finding a piece of FreeBSD's kernel files analysis,
preferably for semaphores or scheduler. I mean, I want to get some
explanations about a file in kernel of FreeBSD. The shorter, the better!

Could you please help me finding something like this? I googled and I'm
going to do it again, but I couldn't find anything.

Thanks in advance.

Sincerely,
Neeku Shamekhi