I have used select and poll before and sort of skipped to io_uring for a recent project, which also doesn't do too well with multiple threads (you have to use multiple rings and do everything else yourself). It's a shame that there is no obvious, relatively easy to use async IO mechanism on Linux that you can use from multiple threads without getting yourself in trouble. Reading more about kqueue it looks a lot like something that would solve it. Why was it not ported to Linux? Would it have been too hard to integrate? The linked article is great btw. Very informative and concise!