Re: [PATCH 1/3] rcu: Introduce hlist_nulls variant of hlist

Em Wed, Nov 19, 2008 at 10:46:24AM -0800, Paul E. McKenney escreveu:

For whatever it is worth, here is a more complete use case, on the
off-chance that it becomes useful some time:

	retry:
	rcu_read_lock();

	retry: /* should be here, huh? */

	hlist_nulls_for_each_entry_rcu(tpos, pos, head, hn_node) {
		if (!(curgen = still_valid(tpos)))
			goto retry;
		if (needs_deletion(tpos)) {
			spin_lock(&update_side_lock);
			if (still_valid(tpos) == curgen)
				hlist_nulls_del_init_rcu(pos);
			spin_unlock(&update_side_lock);
		}
	}
	rcu_read_unlock();

- Arnaldo