const int N = 5;
semaphore s2;
semaphore s;
monitor m{
	condition c;
	int buffer[N];
	int write_pos;
	int read_pos;

	void queue_add(int item){
		buffer[write_pos] = item;
		write_pos = (write_pos + 1) % N;
	}

	int queue_get(){
		int item;
		item = buffer[read_pos];
		read_pos = (read_pos + 1) % N;
		return item;
	}

	init{
		write_pos = 0;
		read_pos = 0;
	}
}

void prod(int i, int n){
	for(i; i<=n; i=i+1){
		wait(s2);
		queue_add(i);
		signal(s);
	}
}

void kons(int n){
	int i;
	int liczba;
	for(i = 1; i<=n; i=i+1){
		wait(s);
		liczba=queue_get();
		signal(s2);
		cout << "Pobralem " <<liczba<< endl;
	}
}

main()
{
	initialsem(s2, 5);
	initialsem(s, 0);
	cobegin {
		prod(1, 5); prod(6, 10); prod(11, 15);  kons(15);
	}
}