An interesting article:

Implementing Queues for Event-Driven Programs

by “No Bugs” Hare

From the article:

We’ve already discussed things related to sockets; now let’s discuss the stuff which is often needed (in particular, it is of Utmost Importance when implementing Reactors), but which is not that common to be universally available as a part of operating system.

I’m speaking about queues. And not only just about “some” queue, but about queues which have certain properties desirable for our Reactors a.k.a. ad-hoc Finite State Machines a.k.a. Event-Driven Programs.