Add philosophe course code without famine, fixed.

[TD_SE.git] / prodcons / prodcons.c

#include <semaphore.h>
#include <unistd.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

#define MAX 6
#define BUF_SIZE 3
typedef struct args {
	sem_t sem_free;
	sem_t sem_busy;
} args_t;
static int buf[BUF_SIZE];
void *prod(void *arg);
void *cons(void *arg);

int main()
{
	pthread_t t1, t2;
	args_t args;
	sem_init(&args.sem_free, 0, BUF_SIZE);
	sem_init(&args.sem_busy, 0, 0);
	pthread_create(&t1, NULL, prod, &args);
	pthread_create(&t2, NULL, cons, &args);
	pthread_join(t1, NULL);
	pthread_join(t2, NULL);
	printf("exit\n");
	return EXIT_SUCCESS;
}

void *prod(void *arg)
{
	int ip = 0, nbprod = 0, obj = 1001;
	args_t *args = (args_t *) arg;
	while (nbprod < MAX) {
		sem_wait(&args->sem_free);
		buf[ip] = obj;
		sem_post(&args->sem_busy);
		printf("prod: buf[%d]=%d\n", ip, obj);
		obj++;
		nbprod++;
		ip = (ip + 1) % BUF_SIZE;
	}
	return NULL;
}

void *cons(void *arg)
{
	int ic = 0, nbcons = 0, obj;
	args_t *args = (args_t *) arg;
	while (nbcons < MAX) {
		sleep(1);
		sem_wait(&args->sem_busy);
		obj = buf[ic];
		sem_post(&args->sem_free);
		printf("cons: buf[%d]=%d\n", ic, obj);
		nbcons++;
		ic = (ic + 1) % BUF_SIZE;
	}
	return NULL;
}