[SO] 28.11.2017 - semafor.h

int key;

int semCreate(int key){

    return semget(key,1, IPC_CREAT|0600);

}

void semInit(int semId){

    semctl(semId,0,SETVAL,1);

}

void semRemove(int semId){

    semctl(semId,0,IPC_RMID);

}

void semDown(int semId){

    struct sembuf buf={.sem_num=0, .sem_op=-1, .sem_flg=0};

    semop(semId,&buf,1);

};

void semUp(int semId){

    struct sembuf buf={.sem_num=0, .sem_op=1, .sem_flg=0};

    semop(semId,&buf,1);

};