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From: Martin Gangkofer <mttg@my-deja.com>
Subject: Re: Interrupt Handlers using GNAT-VxWorks?
Date: 1999/10/15
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References: <7u500m$e96@niven.ksc.nasa.gov>
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Date: 1999-10-15T00:00:00+00:00
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In article <7u500m$e96@niven.ksc.nasa.gov>,
  "John Arnsparger" <jarnspar@ems.jsc.nasa.gov> wrote:
> I am trying to attach an interrupt handler (procedure) to Vector #29
> (decimal) on the mvme167
> board using Ada95 "protected" constructs.  I have tried
> Ada.Interrupts.Attach_Handler,
> which results in "Program_Error: Trying to overwrite a static
Interrupt
> Handler" with a dynamic handler".
>
> I have also tried the "pragma Attach_Handler", which produces a
run-time
> error saying
> "Unitialized Interrupt".
>
> Both of these were declared in package bodies.
>
> Does anyone have any helpful hints or examples of successfully doing
this
> with GNAT-Works m68K?  Or pointers to better references than the LRM?
:-)
>
> Thanks.
>
> John M. Arnsparger
> Lockheed Martin Space Operations
>  e-mail john.arnsparger1@jsc.nasa.gov
>  Phone (281) 244 9693
>  Fax (281) 244 9681
>
>

I actually have had the same problem using APEX/Tornado on top of
VxWorks. As I remember there was a package named

        ada.interrupts.rational.handler.dependent.1.ada

This package contains a handler table, which selects, which interrupts
are legal interrupts and which are not. On illegal interrupts a
Program_Error is raised. Unfortunately, after I made this change, the
problem did relax (I think before I got a Program_Error on call to any
routine in Ada.Interrupts), but there were still Program_Errors raised
when I tried to attach an interrupt handler.

RATIONAL support obviously was not not able to solve this problem, which
was critical to the project I was working on, within half a year! So I
was forced to do a bloody, unstable workaround using a C procedure and
Vxworks interrupt service connect.

This experience was one reason for us to select gnat for our next
project starting end of the year. Therefore I would be happy if you
could keep me informed via email or this newsgroup, whether or gnat
support (ACT) could solve the problem.

--
Martin Gangkofer, System Engineer
ESG Elektroniksystem und -Logistik GmbH, Dept.EF-E
eMail: mgangkof@esg-gmbh.de
Tel:   +49 89 9216 2176


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