util/list: Add a list pair iterator
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5019>
diff --git a/src/util/list.h b/src/util/list.h
index 8a18c4b..17800e4 100644
--- a/src/util/list.h
+++ b/src/util/list.h
@@ -246,4 +246,11 @@
&pos->member != (head); \
pos = LIST_ENTRY(type, pos->member.prev, member))
+#define list_pair_for_each_entry(type, pos1, pos2, head1, head2, member) \
+ for (type *pos1 = LIST_ENTRY(type, (head1)->next, member), \
+ *pos2 = LIST_ENTRY(type, (head2)->next, member); \
+ &pos1->member != (head1) && &pos2->member != (head2); \
+ pos1 = LIST_ENTRY(type, pos1->member.next, member), \
+ pos2 = LIST_ENTRY(type, pos2->member.next, member))
+
#endif /*_UTIL_LIST_H_*/