Monitor Bancone{
    condition friggi;
    condition pronti;
    int nbomb = 0;
    boolean butta = false;

    public int friggi_i(){
        if(nbomb > 0 and !butta)
            wait(friggi);
        return nbomb;

    public void friggi_f(){
        nbomb = 30;
        butta = false;
    }

    public void servi_i(){
         if(nbomb == 0)
              wait(pronti);
    }

    public void servi_f(){
         nbomb--;
         if(nbomb == 0)
             signal(friggi);
    }

    public void scaduti(){
        butta = true;
        signal(friggi);
    }
}

Monitor Clock{
    long tick = 0;
    long alarm = -1;
    condition sleeping;

    public void wait_timer(){
        if(alarm >= tick and alarm != -1)
            wait(sleeping)
    }

    public void tick(){
        tick++;
        if(tick >= alarm and !empty sleeping)
            signal(sleeping);
    }

    public void set_timer(long n){
         alarm = tick + n;
    }
}

Clock clock;
Bancone bancone;

Process Mario{
    while(true){
        int rimasti = bancone.friggi_i();
        if(rimasti > 0) < butta >
        < friggi i bomboloni >
        bancone.friggi_f();
        clock.set_timer(1 ora);
    }
}

Process Piero{
    while(true){
        < attendi cliente >
        bancone.servi_i();
        < servi cliente >
        bancone.servi_f();
    }
}

Process Rosa{
    while(true){
        clock.wait_timer();
        bancone.butta();
        clock.set_timer(1 ora);
    }
}

Process ClockRuns{
    while(true){
        < hardware tick >
        clock.tick();
    }
}