>> The PC instruction is a replacement for SVC. > That's one use case. What about privileged code that scheduled an SRB into > another address space and waited for a cross-memory post? A PC is potentially > much less overhead.
PC routines are not necessary to use XMEM but they make it so easy, why bother setting up XMEM unless you absolutely need to run as fast as possible. >> Both instructions exist solely to run authorized programs in other address >> spaces. > How did you run programs in another OS/360 address space. I don't see any > time machines here. ;-) My bad for saying "other address space" when I meant "any address space". At least I didn't say existed. Jon. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
