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Producer and consumer always skips the same number
sem_init(&empty, 0, SIZE-1);
sem_init(&full, 0, 0);

sem_wait(&empty);

pthread_mutex_lock(&write);
//produce
pthread_mutex_unlock(&write);

sem_post(&full);

sem_wait(&full);

pthread_mutex_lock(&readers);
readCounter += 1;
if (readCounter != 3)
    sem_post(&full);
pthread_mutex_unlock(&readers);

// read

pthread_mutex_lock(&readers);
readCounter -= 1;
if(readCounter == 0)
{
    sem_post(&empty);
}
pthread_mutex_unlock(&readers);

sem_wait(&full);

pthread_mutex_lock(&readers);
// read
pthread_mutex_unlock(&readers);

// process item

sem_post(&empty);