Kernel timers infrastructure

[Filippo Sironi]

Hi everyone,
I'm working on a university project that's based on FreeBSD and I'm currently hacking the kernel... but I'm a complete newbie.
My question is: what if I have to call a certain function 10 times per second?
I've seen a bit of code regarding callout_* functions but I can't get through them. Is there anyone who can help me?

Thanks,
Filippo