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From: josv@planet.nl (josv)
Newsgroups: comp.lang.forth
Subject: Re: PAD and preemptive multi-tasking
Date: Sat, 21 Dec 2024 13:28:43 +0000
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On Fri, 20 Dec 2024 10:10:31 +0000, Anton Ertl wrote:

> Bernd Paysan have been wondering what to do about PAD in the presence
> of preemptive multitasking (but not multi-user) as implemented in
> Gforth.
>
> We see two possible scenarios:
>
> If PAD is used only directly by the user for interactive work, only
> one PAD is needed.
>
> OTOH, if PAD is used as temporary storage in words that may be called
> by any task, PAD needs to be part of the per-task (aka USER) data.
>
> My understanding is that classical multi-tasking Forth systems
> (polyForth, I guess) were also multi-user and had one dictionary per
> task, so they also had one dictionary pointer and therefore one PAD
> per task, but I have not worked with any of them and the descriptions
> I have read have been very sketchy, so this could be wrong.
>
> In any case, the question is how PAD is used by current programs that
> might be run on Gforth.
>
> - anton

I use upad instead:
maxcounted 1+ newuser upad

Jos

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