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From:	RayeR <glaux AT centrum DOT cz>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: PM interrupt handling - how to call old old ISR with slower rate than my new ISR
Date:	Fri, 02 Nov 2007 06:09:32 -0700
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On Nov 2, 11:52 am, "JM Rams" <josepma DOT  DOT  DOT  AT turomas DOT com> wrote:
> Well, I don't simulate  real time clock, I chain my new interrupt, then real
> time interrupt is called more than 18,3 times per second. The thing I do is
> discount real time counters to make the increment only 18,3 times per
> second.
>
> All works, hour, callendar, floppy disk. "uclock" don`t works because it
> uses registers of timer. I do my own uclock.

Aha, understand. but it will not prevent if something else is hooked
at timer.

and another thing. It's suggested to use lock functions to prevent
code/data swapping off.
but how do i get size of code of my PM_ISR?
Somewhere I saw a trick:

void ISR() {...}
void ISR_END {}

and then calc size=(long)ISR_END-(long)ISR;

But GCC seems to not keep the order because I got negative size - mean
that in real ISR_END() is placed at lower address than ISR() so this
completly fails.
Better idea?
Maybe that if it's only small program I could disable paging at all
via crt0 flag but will not mess up when running under windows?

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