Function fdset_try_del

dpdk/lib/vhost/fd_man.c:181–204

* Unregister the fd from the fdset. * * If parameters are invalid, return directly -2. * And check whether fd is busy, if yes, return -1. * Otherwise, try to delete the fd from fdset and * return true. */

 *  return true.
 */
int
fdset_try_del(struct fdset *pfdset, int fd)
{
	int i;

	if (pfdset == NULL || fd == -1)
		return -2;

	pthread_mutex_lock(&pfdset->fd_mutex);
	i = fdset_find_fd(pfdset, fd);
	if (i != -1 && pfdset->fd[i].busy) {
		pthread_mutex_unlock(&pfdset->fd_mutex);
		return -1;
	}

	if (i != -1) {
		pfdset->fd[i].fd = -1;
		pfdset->fd[i].rcb = pfdset->fd[i].wcb = NULL;
		pfdset->fd[i].dat = NULL;
	}

	pthread_mutex_unlock(&pfdset->fd_mutex);
	return 0;
}

/**
 * This functions runs in infinite blocking loop until there is no fd in