#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <signal.h>
#define PERMS 0666

static struct sembuf op_lock1[1] = {0, -1, 0};

static struct sembuf op_unlock1[1] = {0, 1, 0};

static struct sembuf op_lock2[1] = {1, -1, 0};

static struct sembuf op_unlock2[1] = {1, 1, 0};

void blokuj_semafor1(int semid){
    if (semop(semid, &op_lock1[0], 1)<0)
        perror("blad blokowania semafora");
}

void odblokuj_semafor1(int semid){
    if (semop(semid, &op_unlock1[0], 1) < 0)
        perror("blad odlokowania semafora");
}

void blokuj_semafor2(int semid){
    if (semop(semid, &op_lock2[0], 1)<0)
        perror("blad blokowania semafora");
}

void odblokuj_semafor2(int semid){
    if (semop(semid, &op_unlock2[0], 1) < 0)
        perror("blad odlokowania semafora");
}