/* pre: takes in a void* 'n' which must be a pointer to an integer
* post: create a producer thread
*/
void* producer(void *n)
{
int number;
struct s_product* prod;
number = *((int*)n);
#ifdef DEBUG
printf("[DEBUG]\tStarting producer [%d]\n", number);
fflush(stdout);
#endif
/* create products while we have not reached maxProductCount */
while (gl_env.productCount < gl_env.maxProductCount)
{
/* lock on creating a product in order to be sure we have the correct
* productCount
*/
pthread_mutex_lock(&gl_env.create_prod_lock);
/* check count again in case of weird scheduling */
if (gl_env.productCount == gl_env.maxProductCount)
{
pthread_mutex_unlock(&gl_env.create_prod_lock);
break;
}
#ifdef DEBUG
printf("[DEBUG]\tProducer [%d] producing product\n", number);
fflush(stdout);
#endif
prod = produceProduct();
pthread_mutex_unlock(&gl_env.create_prod_lock);
/* the queue handles critical sections itself */
push_q(prod);
printf("Producer %d has produced product %d\n", number, prod->id);
fflush(stdout);
/* usleep for 100 milliseconds */
usleep(100000);
}
/* return NULL removes compiler warning */
return NULL;
}
// Producer code
void *producer(void *argument)
{
int *prodNo = (int *) argument; // Producers identifying number
Node *node; // Produced node
while(1)
{
// Produce or stop
int tw = sem_trywait(&products_remaining);
if(tw == -1) // If there are no more products to be produced, end thread.
{
pthread_exit(0);
}
else if(tw == 0) // There are more products be produced.
{
node = produceProduct(); // Final product
}
else
{
printf("Some error occured when trying to wait on products_remaining semaphore");
}
// Add product to buffer
sem_wait(&empty); // Wait for room in buffer.
list_add(itemList, node); // Add node to list.
// Increase count of number products in buffer.
pthread_mutex_lock(&products_buffer_lock);
products_in_buffer++;
printf("Producer %d produced %s. Items in buffer: %d (out of %d) \n", *prodNo, node->elm, products_in_buffer, buffer_size);
pthread_mutex_unlock(&products_buffer_lock);
sem_post(&full); // Signal full so buffer space is decreased by 1.
// Sleep for random time.
sleepRandom(10000);
}
}