It was in FreeBSD!
http://www.freebsd.cz/kse/index.html
For some reason, it didn't work out, and FreeBSD switched back to conventional threads, around 7.0, i think.
http://www.freebsd.cz/kse/index.html
For some reason, it didn't work out, and FreeBSD switched back to conventional threads, around 7.0, i think.
I'd love to see that idea wind up in a mainstream kernel.