[cesarb]

Setting aside that many here are self-taught (or haven't even reached university age yet, the first class when I went to university had an interesting bimodal distribution: half the class already knew how to program well, the other half had no idea), there are other reasons why an article like this is useful:

* Some might not have learned that particular piece of knowledge, either because their particular OS class didn't cover it, or because they skipped it;

* Others might have learned it, but later forgotten all about it, or at least some of the details;

* Even if they do remember it, this article can act as a reminder ("pay attention if you set thread priorities, because priority inversion").