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From: egullich@MOON (Eric Gullichsen)
Newsgroups: comp.sys.amiga
Subject: Prolog for the Amiga... need help
Message-ID: <8711092331.AA08117@moon.ads.arpa>
Date: Mon, 9-Nov-87 18:31:55 EST
Article-I.D.: moon.8711092331.AA08117
Posted: Mon Nov  9 18:31:55 1987
Date-Received: Wed, 11-Nov-87 20:28:19 EST
Sender: daemon@zodiac.UUCP
Lines: 42





Hello net:

In response to the recent postings asking about a Prolog for the Amiga
(and more honestly, 'cause I want one) I spent a few hours trying to
port Edinburgh's CProlog, for which I have licenced source, to Aztec.
CProlog comes from the darkest antiquity of Prolog history, the
source I have being a 1982 port from an ICL 2900, whatever that is...

[The code is rather grotesque, with gotos (!) and many liberties
taken with typing. Statements like:  p = *p  abound.]

The problem I pose for the wizards is as follows:

	How to do signals a la Unix in Aztec?

Specifically, I have to be able to interrupt Prolog execution on a
user's ^C, and jump to an interrput handler.

Lattice seems to support signals as I need them, but the code would
require more work than I have the patience for in order to compile
under Lattice, whereas compilation (despite many warnings) seems OK in
Aztec.

Any pointers to an example of handling ^C interrupts in Aztec,
anywhere on Fish disks or some other source I'm likely to have, will be
greatly appreciated, and rewarded by the eventual posting of a set of
Prolog diffs here. The AmigaDOS manual talks of "break" as setting "attention
flags" in a task. RKM says nothing about attention flags, and is
vague (to my inexperience) about software interrupts in interrupt
processing.

	Thanks from an Amiga neophyte

- Eric Gullichsen
ARPA:   egullich@ads.arpa
Usenet: ...sun!ads!egullich

I merely consult for ADS. They no nothing of this.