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//
//  producer_consumer_using_semaphore.c
//  
//
//  Created by Bibhas Ghoshal on 02/10/19.
//

#include<stdio.h>
#include<semaphore.h>
#include<pthread.h>
#define NBUFF 10

int nitems;

struct
{
    int buff[NBUFF];
    sem_t mutex,empty,full;
}shared;

void *produce(void*); void *consume(void*);

int main(int argc,char**argv)
{
    pthread_t tid_produce,tid_consume;
    
    if(argc!=2)
    {
        printf("usage:filename<nitems>");
        return 0;
        
    }
    printf("\n\nproducer_consumer problem using semaphore \n");
    printf(".......................................................................................\n");
    
    nitems=atoi(argv[1]);
    
    sem_init(&shared.mutex,0,1); // Intializing
    sem_init(&shared.empty,0,NBUFF);
    sem_init(&shared.full,0,0);
    pthread_setconcurrency(2);
    
    pthread_create(&tid_produce,NULL,produce,NULL);
    pthread_create(&tid_consume,NULL,consume,NULL);
    pthread_join(tid_produce,NULL); pthread_join(tid_consume,NULL); sem_destroy(&shared.mutex); sem_destroy(&shared.empty); sem_destroy(&shared.full);
    
    
}