Date:	Tue, 12 Sep 95 09:51 MDT
From:	mat AT ardi DOT com (Mat Hostetter)
To:	digisoft AT eis DOT net DOT au (Paul)
Cc:	djgpp AT sun DOT soe DOT clarkson DOT edu
Subject:	Re: interrupt stops being invoked
References:	<199509120623 DOT QAA22743 AT tinny DOT eis DOT net DOT au>

>>>>> "Paul" == Paul  <digisoft AT eis DOT net DOT au> writes:

    Paul> How can you get the size of a piece of "C" code that
    Paul> services the interrupt so that it can be locked.  Up till
    Paul> now I just lock it all to be safe.

As a TOTALLY EVIL hack, you can do something like:

----------------------------------------------------------------------
void interrupt_memory_start (void) { }

void my_interrupt_handler (void)
{
  ...
}

void interrupt_memory_end (void) { }
----------------------------------------------------------------------


and then lock:

	(char *) interrupt_memory_end - (char *) interrupt_memory_start

bytes, starting at:

	(char *) interrupt_memory_start

Of course, there's no guarantee that this will work (I think even
casting a function pointer to a char * is forbidden) but it happens to
be the case that this works with the latest djgpp (just make sure all
of your functions are non-static).

-Mat

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