Simple thread safe Queue in C. Check out main.c to see how it is used. Thread safety comes from using pthread mutex on write/read.
What might be interesting is to see how I used a struct to simulate a namespace. Everything except of what I choose to export is "private". This makes it easy to think in terms of modules. The design of a module's interface becomes a separate task, and might thus get more attention than otherwise.
Inspired by: http://stackoverflow.com/questions/389827/namespaces-in-c#answer-389961
