[SO] 28.11.2017 - p1.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "semafor.h"

int main()
{
    key_t key =  ftok(".",0);
    int semId =  semCreate(key);
    semInit(semId);
    int PID = fork();
    if(PID == -1)
    {
            perror("Blad tworzenia procesu\n");
            exit(1);
    }
    else if(PID == 0)
    {
            int j=1;
            for(int i=0;i<5;i++)
            {
            semDown(semId);
                printf("PID%d(%d) = %d\n",i+1,j++,getpid());
                printf("PID%d(%d) = %d\n",i+1,j++,getpid());
                printf("PID%d(%d) = %d\n",i+1,j,getpid());
                j= 1;
                    sleep(2);
                    semUp(semId);
            }
    }
    else
    {
            for(int i=0;i<5;i++)
            {
            semDown(semId);
            printf("\t PID%d(%c) = %d\n",i+1,'A',getpid());
            printf("\t PID%d(%c) = %d\n",i+1,'A'+1,getpid());
            printf("\t PID%d(%c) = %d\n",i+1,'A'+2,getpid());
            sleep(1);
            semUp(semId);
            }
            wait(NULL);
            semRemove(semId);
    }

}