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From: Bruce or Tracy Jacobs <bljacobs2@mchsi.com>
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Subject: Re: Keyboard Polling Solution
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Xref: archiver1.google.com comp.lang.ada:5734
Date: 2004-02-22T21:26:17+00:00
List-Id: <comp.lang.ada>

I am playing with an Ada OpenGL graphics program that allows the user to 
manipulate output graphics (zoom in, out, move around, etc) but I 
didn't want the entire program to stop and wait for input because it
needs to stay busy doing things.  


Marin David Condic wrote:
> 
> Well, there you go! I have not messed with any keyboard input in so long
> I'd completely forgotten about that. But yes, that looks like it would
> do the job.
> 
> I'd be curious why you want to poll. Usually, one tries to avoid that,
> but I know I've wanted something going on in the background that might
> stop when the user hit a key. The usual trick would be to have a task
> looking at keyboard input with another task doing the background job.
> Sometimes this wouldn't work with some implementations because the I/O
> operation didn't flag the task as "blocked", so the background would
> starve. Then you might want to resort to some kind of polling.
> 
> MDC
> 
> Bruce or Tracy Jacobs wrote:
> > A version of Get_Immediate does this.  If there is nothing in the
> > buffer, it returns
> > FALSE and lets you continue on.
> >
> 
> --
> ======================================================================
> Marin David Condic
> I work for: http://www.belcan.com/
> My project is: http://www.jsf.mil/NSFrames.htm
> 
> Send Replies To: m   o   d   c @ a   m   o   g
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> 
>      "Face it ladies, its not the dress that makes you look fat.
>      Its the FAT that makes you look fat."
> 
>          --  Al Bundy
> 
> ======================================================================