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From: Ted Dennison <dennison@telepath.com>
Subject: Come From Forever! (was: No Go To's Forever!)
Date: 2000/03/28
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In article <yecog80f1vr.fsf@king.cts.com>,
Keith Thompson <kst@cts.com> wrote:
> Ted Dennison <dennison@telepath.com> writes:
> [...]
> > The "come from" statement is actually a lot more powerful than the
> > goto statement though. For instance, multiple "come from"s for the
> > same line is one way to implement a multi-threaded algorithm.
>
> Not the way it's defined in Intercal. If I recall correctly, only one
> "come from" for a given label can be active at a time.

That is true for the old C-Intercal (Intercal73?). But for Threaded
Intercal multiple "come from"'s are the means of starting new threads. A
discussion of the proposed standard is available at
http://www.cse.unsw.edu.au/~malcolmr/threaded_intercal.html

Here is the relevant exerpt:
Initially there is only one thread. New threads are created by using
COME FROM statements. Unlike standard C-Intercal, multiple COME FROM
statements are allowed for a particular line number. If more than one
such COME FROM exists, then the thread shall split into several threads,
one for each COME FROM.

--
T.E.D.
http://www.telepath.com/~dennison/Ted/TED.html


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