Shared system routines

[edhall%rand-unix at sri-unix.UUCP]

The idea precedes VMS; DEC's RSTS/E for the PDP-11 has had `Run-Time
Systems' for some time.  They essentially allow re-entrant code to
be accessed by any number of jobs at once.

Even such a beast as Perkin-Elmer's OS/32 has re-entrant libraries.

Any discussion as to why (or how) such a thing could/couldn't be added
to UNIX?

		-Ed