Creating a library for the SLOW protocol

Goal: a portable library

• SLOW is an exciting new protocol
• Barbara sets out to build a reusable library
• She wants it to be usable by as many people as possible, so she wants it to be portable across runtimes and other environments, but how to do that?

First attempt: define traits

• Starts to define traits but it's quite complicated
• Would have to make things generic

Next attempt: cfg flags

• Starts to define cfg flags

Gives up and just uses tokio

• Ends up using all kinds of things from the tokio library
• Factors out some logic into a "runtime independent core" but needs to have a lot of layers on both sides

Tries later to separate out tokio

• Really hard, lots of small utilities scattered about