Re: keyboard polling in ADA

[wheeler@ida.org (David Wheeler)]

Matthew S Low (mlow@galaxy.csc.calpoly.edu) wrote:

: I'm sorry, in my last posting for keyboard polling in Ada I forgot to
: mention that I am attempting to do this using BSD UNIX. I was also asked
: whether I was trying to "do something" while the program looped waiting for
: a keystroke, and the answer is yes. I'm beginning to look into the areas of
: interrupts and forking tasks in ADA. Any help or suggestions would be
: greatly appreciated. 

There are at least 3 ways I can think of:

1. Use a pragma Convention(...) and call the operating system, presuming
   that the OS provides a way to poll the keyboard.
   This is usually easy.
2. Use Ada 95, which has a way to poll the keyboard in Text_IO.
3. Use Ada tasks to implement this.
   For an example, see the "PDI" example at:
        http://lglwww.epfl.ch/Ada/Examples/PDI/


This sort of stuff depends on the Ada implementation & OS interface.
   


--- David A. Wheeler
Net address: wheeler@ida.org