Programming

This post is about why we need a coroutine package for Go, and what it would look like. But first, what are coroutines?

Every programmer today is familiar with function calls (subroutines): F calls G, which stops F and runs G. G does its work, potentially calling and waiting for other functions, and eventually returns. When G returns, G is gone and F continues running. In this pattern, only one function is running at a time, while its callers wait, all the way up the call stack.