#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>

#define SEM_MODE 0666

int global_semid = 3;

void P (int semid)
{
	struct sembuf sbuf;

	sbuf.sem_num = semid;
	sbuf.sem_op = -1;
	sbuf.sem_flg = 0;
	if (semop (global_semid, &sbuf, 1) < 0)
		perror ("semop P");
	return;
}

void V (int semid)
{
	struct sembuf sbuf;

	sbuf.sem_num = semid;
	sbuf.sem_op = 1;
	sbuf.sem_flg = 0;
	if (semop (global_semid, &sbuf, 1) < 0)
		perror ("semop V");
	return;
}

void Init (int* semid, int value)
{
	union {
		int val;
		struct semid_ds *buf;
		u_short *array;
	} arg;

	arg.val = value;
	if (semctl (global_semid, semid, SETVAL, arg) < 0)
		perror ("semctl SETVAL");
	return;
}

void Print (int semid)
{
	int val;

	if ((val = semctl (global_semid, semid, GETVAL)) < 0)
		perror ("semctl GETVAL");
	printf ("Semaphore %d's value = %d\n", semid, val);
	return;
}

void initialize()
{
  initoutput();
  queueInit(qSize);
  Init(MUTEX_SEM, 1);
  Init(EMPTY_SEM, qSize);
  Init(FULL_SEM, 0);
  Init(ITEM_ID_MUTEX_SEM, 1);
  Init(INCR_CONS_COUNT_SEM, 1);
}