Efficent timer (maybe)

Timer.pde

int lastTime; //variabile
boolean stopTime = false;
int currentTime = 0;
int delay = 1000; //millis
final int INIT = -1;
final int RESTING = 0;
final int SHOWING = 1;
int state = INIT;
boolean debug = true;

void setup() {
  size(500, 500);
  noStroke();
  
  
}

void initTime() { //resettiamo tutto
  currentTime = 0;
  stopTime = false;
  thread("timer");  
  state = RESTING;
}

//int timeResting = 0;
int timeToRest = 5;

void draw() {
  
  background(#333333); //nero "elegante"
  switch(state) {
   case INIT:
     timeToRest = (int) random(2, 7);
     initTime();
     text("Init...", width / 2, height / 2);
   break;
   case RESTING:
   println(timeToRest);
     if (currentTime > timeToRest) {
       state = SHOWING;
     }
   break;
   case SHOWING:
     if (currentTime - timeToRest > 1) {
       state = INIT;
     }
     ellipse(width / 2, height / 2, 100, 100);
   break;
   
  }
  if (debug)
    text(currentTime, 20, 20);
}

void keyReleased() {
 if (keyCode == ESC) {
  stopTime = true; 
 }
 if (key == 's') {
   if (stopTime == false) {
    stopTime = true; 
   } else {
    state = INIT; 
   }
 }
 
 if (key == ' ') {
   paused = !paused; //tipico "toggle"
 }
}

boolean paused = false;
void timer() {
  println("Timer started!");
  lastTime = millis();
  while(!stopTime) {
    if (!paused && millis() - lastTime > delay) {
      currentTime++;
      lastTime = millis();
    }
    
    if (currentTime > 100000)
      stopTime = true;
  }
  
  println("Timer stoped!");
}