Re: Keyboard Polling Solution

[Bruce or Tracy Jacobs <bljacobs2@mchsi.com>]

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.
> >
> 
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> Marin David Condic
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