Function fdset_add

dpdk/lib/vhost/fd_man.c:115–140

* Register the fd in the fdset with read/write handler and context. */

 * Register the fd in the fdset with read/write handler and context.
 */
int
fdset_add(struct fdset *pfdset, int fd, fd_cb rcb, fd_cb wcb, void *dat)
{
	int i;

	if (pfdset == NULL || fd == -1)
		return -1;

	pthread_mutex_lock(&pfdset->fd_mutex);
	i = pfdset->num < MAX_FDS ? pfdset->num++ : -1;
	if (i == -1) {
		pthread_mutex_lock(&pfdset->fd_pooling_mutex);
		fdset_shrink_nolock(pfdset);
		pthread_mutex_unlock(&pfdset->fd_pooling_mutex);
		i = pfdset->num < MAX_FDS ? pfdset->num++ : -1;
		if (i == -1) {
			pthread_mutex_unlock(&pfdset->fd_mutex);
			return -2;
		}
	}

	fdset_add_fd(pfdset, i, fd, rcb, wcb, dat);
	pthread_mutex_unlock(&pfdset->fd_mutex);

	return 0;
}

/**
 *  Unregister the fd from the fdset.