google. we are not a file library

Have you looked on the Internet? The very first hit Google returned had a link
to its source  code!!!!

wat is "dining philosophers" all about ?

Dining Philosophers, if i remember it right, is an algorithm.

i must have encountered it in my Operating Systems class.

More likely AI - it's one of those problems used to confound beginner
students

Yeah this problem is about using the shared resources. Situations where the
process is not waiting too long for resources and also not create a dead lock.

Look it up on the Internet!!