#include <unistd.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <operIPC.h>

// semaforos SVR4
void P( int semid, int sem ) // semWait
{
   struct sembuf buf ;
   buf.sem_num = sem ;
   buf.sem_op = -1 ;
   buf.sem_flg = 0 ;
   semop (semid,&buf,1) ;
}

void V( int semid, int sem )  // semSignal
{
   struct sembuf buf ;
   buf.sem_num = sem ;
   buf.sem_op = 1 ;
   buf.sem_flg = 0 ;
   semop (semid,&buf,1) ;
}