Re: Safe ANSI C Subset

Jan Soderberg (Jan.Soderberg@mecel.se) wrote:
> Does anyone know of any ANSI C subsets defined for safety critical
> real-time applications?


Short answer ;


Yes, there's a 'subset' called C++


A bit longer answer ;


I am not aware of any subsets of 'C' wich handle this sort of thing, I
do know that most military applications (at least in this country) are
written in plain 'C' - although they do use specific libraries wich
were made for some critical operations (but even those are mainly
system-dependant parts wich deal with stuff like atomic timers,
etc). This is actually quite an interesting thing, Maybe it would be
an idea to ask around at NASA - they probably know more about this
sort of thing - although I'm not even sure if they use 'C' ... but
then again, maybe they do, e.g.


  int i;


  for( i = 10 ; i > -1 ; i--)
        do_countdown(i);


  boost_rockets();


  while(not_crashed)
    {
        g_force++;


        if(!doors_closed)
                shout("oh dear...");


        if(out_of_orbit)
          {
            if(landed)
              {
                  if(aliens_present)
                      notify_mulder_and_scully();
                  else
                      play_some_weightless_basketball();
              }
        }
    }


;)


Cheers, flux.
--

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