ОС - Музичари

//reshenie na :
//https://github.com/finki-mk/OS/tree/master/synchronization/src/main/java/mk/ukim/finki/os/synchronization/exam17/k1/g1

package ispiti;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Semaphore;

public class Muzichari {

    static Semaphore gitaristi;
    static Semaphore pejaci;
    static Semaphore pejaciLock;
    static Semaphore gitaristHere;
    static Semaphore ready;
    static Semaphore finished;
    static int numPejaci = 0;

    static State state = new State();

    public static void init(){
        gitaristi = new Semaphore(3);
        pejaci = new Semaphore(2);
        pejaciLock = new Semaphore(1);
        gitaristHere = new Semaphore(0);
        ready = new Semaphore(0);
        finished = new Semaphore(0);

    }


    private static class Pejac extends Thread{

        public void execute() throws InterruptedException {
            pejaci.acquire();
            pejaciLock.acquire();
            numPejaci++;
            if(numPejaci == 2){ //ovoj ke bide kontroler
                gitaristHere.acquire(3); //bara dali vekje ima stignato 3 gitaristi
                ready.release(5); //sega e oformen bendot, da se izvestat site
            }
            pejaciLock.release();

            ready.acquire();
            state.play("Pejac");
            finished.release();

            pejaciLock.acquire();
            numPejaci--;
            if(numPejaci==0){
                finished.acquire(5);
                state.evaluate();
                pejaci.release(2);
                gitaristi.release(3);
            }
            pejaciLock.release();


        }
        @Override
        public void run() {
            try {
                execute();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static class Gitarist extends Thread{
        public void execute() throws InterruptedException {
            gitaristi.acquire();
            gitaristHere.release(); //kazhuva deka pristignal gitarist
            ready.acquire();
            state.play("Gitarist");
            finished.release();
        }

        @Override
        public void run() {
            try {
                execute();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static class State{
        public void play(String musician){
            System.out.println(musician+" will play");
        }

        public void evaluate(){
            System.out.println("Evaluating...");
        }
    }

    public static void main(String[] args) throws InterruptedException {
        init();
        List<Thread> threads = new ArrayList<>();

        for(int i=0; i<10;i++){
            Pejac p = new Pejac();
            threads.add(p);
            p = new Pejac();
            threads.add(p);

            Gitarist g = new Gitarist();
            threads.add(g);
            g = new Gitarist();
            threads.add(g);
            g=new Gitarist();
            threads.add(g);
        }

        for(Thread t:threads){
            t.start();
        }

        for(Thread t:threads){
            t.join();
        }

        System.out.println("Uspeshna sinhronizacija");

    }

}