Thank you, John! Checking it out now.

Thanks. It makes it a little bit more clear now. You should write an article for newbies like me. Are there any good books (articles?) which would describe lock-free/wait-free concepts on a higher level, without diving into details too much? Most of the blog posts suppose that you already know a lot of low-level stuff. Or maybe I should just start from reading something completely different.

Can someone explain me, what are lock-free data structures? I don't get it.

off-topic: who is behind the «Kukuruku» project?

Is that your first mobile app?