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From: "Mario Cossi" <m DOT cossi AT qitech DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: lengthy interrupt routines
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Date: Tue, 22 Jun 2004 14:14:01 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi,
I am working on an embedded application on a DOS box which has to
respond to an interrupt. The amount of processing required to respond to
the interrupt is fairly large and requires a number of non-reentrant
DOS/BIOS calls. To address this problem I had the interrupt routine do
the bare minimum, storing some data in a circular buffer, then I
sprinkled my code with something like:

if (gotEvent ())
  serveEvent ();

Ugly, but served its purpose. Now I added in the app a few calls to an
external math library that makes some heavy processing and response time
to the interrupts is no longer acceptable. The obvious solution would be
to go and "cure" the library with the same "if (gotEvent ())..." stuff,
but I would rather not as the library is being developed elsewhere and
is changed pretty often.
Any clue?

Thanks in advance
-m