LMFAO is part of an article about Asynchronous callbacks in C extensions. It is meant to serve as an example project, allowing me to publish a complete working code sample.
Download the project, make sure you have Ruby available and run rake -T to see available rake tasks and their description. Hopefully it’s straight-forward from there.
Good question! This is answered in detail in the article I’ve written named Asynchronous callbacks in C extensions.