BTW Windows got it thanks to Dave Cutler whom they poached from VMS. VMS, I hear, head and shoulders above everyone in concurrent I/O at that time. Concurrency

BTW Windows got it thanks to Dave Cutler whom they poached from VMS. VMS, I hear, head and shoulders above everyone in concurrent I/O at that time. Concurrency story on the unix side has always been weaker in comparison. That's bit of a shame because the _logical_ virtual machine that C targeted, the PDP, had instruction level support for coroutines. BTW you don't really need kernel support for concurrency although it helps a great deal if you have. One way to do it would be to compile coroutines to an eventloop runtime and break read and writes into smaller concurrent chunks.