function doSomeStuff(ENTITY* ent){
   while(ent){
      // do something as logn as the entity exists
      wait(1);
   }
   // do something else -> this is not performed!!!
}

function bodentextur_fuer_turm_steuern(PARTICLE* bodentextur, ENTITY* turm){
	set(bodentextur, TRANSLUCENT);
	bodentextur.alpha = 100;
	while (turm){
		bodentextur.lifespan = 16000;
		wait(1);
	}
	debug1 = 1;
	while(bodentextur.alpha > 0){
		bodentextur.lifespan = 16000;
		bodentextur.alpha -= time_step;
		wait(1);
	}
	bodentextur.lifespan = 0;
}