After discovering an interesting open-source project, I decided to start a new personal project: creating a WebGL web tool for building diagrams with an isometric visual style.

Coroutines are special functions that allow execution to be suspended and resumed, and are a very powerful tool to build complex applications in an intuitive way. This article introduces an implementation of coroutines in portable ISO C, using the principles of the Duff's device and some C preprocessor abuse.