edhall@rand-unix@sri-unix.UUCP (05/25/83)
Having installed job-control on a PDP-11 (and noting that the lastest PDP-11 UNIX from Berkeley has done the same), I can report that it has nothing to do with the demand-paging features of 4.x BSD. Job-control is basically a re-working of the UNIX signal mechanism. A number of new signals are added as well as two new signal actions (stop and con- tinue). Also, the ability to selectively hold signals (rather than ignoring them), both by programmer action and automatically (to avoid the problem V7-style systems have with multiple signals), has been added. In addition, a mechanism for manipulating process groups was needed. None of this requires demand-paging, so a UNIX system with job-control needn't have demand-paging, and vice-versa. -Ed ucbvax!trw-unix!randvax!edhall edhall @ rand-unix
fair@ucbvax.UUCP (06/19/83)
That message about Job control having nothing to do with paging is right on the money. The Onyx at Berkeley (ucbonyx) (a z8000 based Unix system) has been running a kernel with job control in it since December 1982. Erik E. Fair ucbvax!fair fair@ucb-arpa