From: newhallw AT escmail DOT orl DOT mmc DOT com
Date: Tue, 18 Jun 96 09:44:39 EDT
Message-Id: <9606181344.AA08406@cvfive>
To: djgpp AT delorie DOT com
Subject: MouseTrapping: An old problem revisited...in more detail


> Well, I did that. But I just called one other function in the interrupt. 
> And this function modifies a ring buffer with mouse events. No complicated
> stuff. I can send some code samples, if you want any. djgpp V1, by the way.

> There is a mouse function that can be used to register a user-defined 
> function that will be called by the mouse driver when certain 
> user-defined events (such as mouse click or mouse movement) happen.  
> Isn't this what you are after?  If so, then this is doable in DJGPP.

I have successfully compiled and ran code which--when the mouse is moved
or a button is pressed--calls a function in my DJGPP program that modifes
a number of global variables and then returns to "the regularly scheduled
program in progress."  Yes, that can be done. I've done it, too.

What I am interested in doing, however, is having the function called
by the mouse interrupt call ANOTHER djgpp function(i.e. to blit a
mouse cursor on the screen, draw a line, start rendering a scene, 
et cetera...) and the problem is that I get gpf's when I try to
do this...what I remember(vaguely) from months ago was that a stack
swap is required to handle such requests(or something like that) but
I need more information on how to do this...