#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#define MAXITER 10
sem_t mutex,pieno,vuoto;
char arr[10]; int in,out;


void *produci(){
  int i=0;
  while (i<MAXITER){
    	i++;
    	char c =(char) (random() % 26)+97;
    
    	sem_wait(&vuoto);
    	sem_wait(&mutex);
    	arr[in]=c;  
	printf("Inserito %c in  %d.\n",c,in);
    	in = (in+1) % 10;
    	sem_post(&mutex);
    	sem_post(&pieno);
  }
}
void *consuma(){
  int i=0;
  while (i<MAXITER){
    	i++;
    sleep(1);
    	sem_wait(&pieno);
    	sem_wait(&mutex);
    	char c = arr[out];  
	printf("Prelevo %c da %d.\n",c,out);
    	out = (out+1) % 10;
    	sem_post(&mutex);
    	sem_post(&vuoto);
  }
}

int main(){
  pthread_t prod,cons;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  
  int err;

  sem_init(&mutex,0,1);
  sem_init(&pieno,0,0);
  sem_init(&vuoto,0,10);
  
  in=0; out=0; 
  
  
  pthread_create(&prod, &attr, produci, NULL);   
  pthread_create(&cons, &attr, consuma, NULL);

  pthread_attr_destroy(&attr);
  pthread_join(prod, NULL);   
  pthread_join(cons, NULL);   	
  printf("Joined!\n");
  return 0;
}