Xref:	news2.mv.net comp.os.msdos.djgpp:5385
Newsgroups:	comp.os.msdos.djgpp
From:	tob AT world DOT std DOT com (Tom Breton)
Subject:	[Q] How does go32 handle the timer tick (interrupt 0x08)?
Message-ID:	<DtLE6z.IKn@world.std.com>
Reply-To:	tob AT world DOT std DOT com
Organization:	BREnterprises
Date:	Wed, 26 Jun 1996 05:35:23 GMT
Lines:	42
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I have been trying to install a timer interrupt (0x08) handler for a
program under DJGPP/Go32. I've tried a dozen different things and none
worked. No matter what I do, it often crashes, won't deinstall, and
won't co-operate with the keyboard handler. If it's waiting for a
keystroke it loses interrupts.

Can someone please tell me:

        How has the timer tick been handled in other apps?

        Roughly, what does go32 do with the timer tick? In which source
        files would I find this? (Some idea of the function names would
        be nice too)


I read the FAQ, of course, but it about says that timer, keyboard and
mouse interrupts will be a problem and recommends looking for a program
I can't find (ladybug debugger) I checked Oakland, the 3 US Simtel
mirrors mentioned, and archie.

I checked out the timer interrupt section in the DJGPP game programming
FAQ, but it crashes and it has some big mistakes anyways.

I checked out the DPMI spec, and tutorials, but there is no mention of
special handling of the timer tick.

I have checked out both programs recommended in the FAQ: sb02 sets
totally different interrupts. If you use it on 0x08 it just dies
(Specifically, it always dies when it calls
_go32_dpmi_set_real_mode_interrupt_vector. No way around that. It also
often (unpredictably) dies after
_go32_dpmi_set_protected_mode_interrupt_vector) I know it's special to
0x08 because the same code has no problem when I tell it  to set a
different interrupt (0x50, which doesn't get called AFAIK)

I checked out the go32 source code, but I could find no mention of the
timer interrupt. grep didn't help and it would take forever to puzzle it
out with no idea where to start.

        Tom

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