Ask HN: Where to learn real-time scheduler architecture?

Hi hackers, I'm working on some real time code in a music context, and am looking resources on writing low level soft-real time scheduler engines in C or C++: patterns, data structures, tradeoffs of different approaches, etc. As in, engines for managing events in time, where the application may be doing a lot of manipulation of both the events, and the timeline. If anyone know of good books, sites, open source code to look at, or really any other resource that gets into this topic deeply, I'd love to hear of them. I'm having a hard time finding books that get into this deeply, I have a feeling I don't know where to look. thanks.