> This StackExchange answer (from 11 years ago) seems relevant: > > https://stackoverflow.com/questions/1163846/what-is-a-reentrant- > kernel > > Note this comment: > > This is pretty much standard for today's desktop operating systems.
Interesting, but that's not the kind of re-entrancy I'm talking about. The discussion in stackoverflow is about multitasking kernels, not re-entrant kernels. I'm talking about something where you can "spawn" a whole new OS when you want -- not just temporarily interrupt an existing OS kernel to request it to perform some function for you. That's what something like the SDA in DOS could (at least theoretically) allow you to do. Instead of modern Virtual Machines where one OS provides a "virtual environment" in which another OS can run, you would actually be able to start another copy of the same (or different) OS and have the two of them run in parallel using different memory spaces. One wouldn't be "inside" the other. _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
