/* Misc Functions */

void threadsafe_msleep(long t) {
   long start = mseconds();
   while(mseconds() < start + t)
     defer();
}

void threadsafe_sleep(float t) {
   threadsafe_msleep((long)(t * 1000.0));
}

int sign(float a){
	if ( a > 0.0 ) return 1;
	else return -1;
} /* sign() */

float fabs(float a){
  if ( a > 0.0 ) return a;
  else return -a;
} /* fabs() */

void wait_start()
{
  while (!press_start());
}

int press_start()
{
  if (!start_button()) return 0;
  while (start_button());
  return 1;
}

int press_stop()
{
  if (!stop_button()) return 0;
  while (stop_button());
  return 1;
}