/*
 *  call-seq:
 *    runtime  ->  Integer
 *
 *  Return the number of milliseconds since the Rubygame timer system
 *  was initialized.
 *
 *  The Rubygame timer system will be initialized when you call this function,
 *  if it has not been already.
 */
VALUE rbgm_time_getticks( VALUE module )
{
  if(!SDL_WasInit(SDL_INIT_TIMER))
        if(SDL_InitSubSystem(SDL_INIT_TIMER))
          rb_raise(eSDLError,"Could not initialize timer system: %s",\
                           SDL_GetError());
  return INT2NUM(SDL_GetTicks());
}