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

#define LIMIT 10000

int buffer = 0;
int max = 5;
int vez = 0;
int querEntrar[2];

void *producer()
{
    int c;

    for (c = 0; c < LIMIT; c++) {
        querEntrar[0] = 1;
        vez = 1;
        while (querEntrar[1] == 1 && vez == 1) {
            usleep(100);
        }
        if (buffer < max) {
            buffer++;
            printf("Buffer: %d\n", buffer);
        }
        querEntrar[0] = 0;
        usleep(100);
    }
    pthread_exit(NULL);
}

void consumer()
{
    int c;

    for (c = 0; c < LIMIT; c++) {
        querEntrar[1] = 1;
        vez = 0;
        while (querEntrar[0] == 1 && vez == 0) {
            usleep(100);
        }
        if (buffer > 0) {
            buffer--;
            printf("Buffer: %d\n", buffer);
        }
        querEntrar[1] = 0;
        usleep(100);
    }
}

int main(int argc, char **argv)
{
    pthread_t thread;

    querEntrar[0] = 0;
    querEntrar[1] = 0;
    vez = 0;

    pthread_create(&thread, NULL, &producer, NULL);
    consumer();
    pthread_exit(NULL);
}