I want to write own GPU miner, but I can't find any simple solution (cgminer and RPC miner are big projects with many useless to me functions). I need the sources of only one GPU miner with long pooling, nothing more.
This is the simplest miner I know of:
This is a 'getwork' CPU mining client for bitcoin.
It is pure-python, and therefore very, very slow. The purpose is to provide a reference implementation of a miner, for study.
This doesn't support long polling, but there's a spec for that here.