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From: edhall@rand-unix@sri-unix.UUCP
Newsgroups: net.micro
Subject: Re:  Re: Unix for Micros, a clarification
Message-ID: <1559@sri-arpa.UUCP>
Date: Tue, 24-May-83 20:29:00 EDT
Article-I.D.: sri-arpa.1559
Posted: Tue May 24 20:29:00 1983
Date-Received: Sun, 29-May-83 06:39:43 EDT
Lines: 16

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