From:	ayoung <ayoung AT pacific DOT net DOT hk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Threads
Date:	Sun, 06 Feb 2000 13:36:30 -0800
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To:	djgpp AT delorie DOT com
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Within the listed thread packages to allow a pre-emptive scheduler signals
via DPMI are used.  Does anyone know the context switching overheads of this
construction and how high could the timer resolution be pushed ?

Eli Zaretskii wrote:

> On Sat, 5 Feb 2000, Robin Johnson wrote:
>
> > Anybody know how to do 2 simultaneous threads in a DJGPP program?
> > I want to make a STL queue of a structure and just have my main code to
> > add items onto the queue, that a separate thread in my program is
> > handling at the same time.
>
> I suggest to take a look at section 22.4 of the FAQ (v2/faq230b.zip
> from the usual DJGPP sites), it lists several threading packages which
> support DJGPP.
>
> > I think I could probably hook into the timer interrupt, but
> > my queue handler thread could take a little long, and mess up the
> > timing.
>
> Running a scheduler (which needs to switch stacks) from a hardware
> interrupt handler is explicitly prohibited by the DPMI spec.

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