util: Add a new macro for testing empty lists.

diff --git a/src/gallium/auxiliary/util/u_double_list.h b/src/gallium/auxiliary/util/u_double_list.h
index d108d92e52b28fcd5096d5585aafba08a4dcb832..53bb1342ddcba9e1712e0d11f3f44ecd2c22d130 100644 (file)
--- a/src/gallium/auxiliary/util/u_double_list.h
+++ b/src/gallium/auxiliary/util/u_double_list.h
@@ -95,5 +95,8 @@ struct list_head
 #define LIST_ENTRY(__type, __item, __field)   \
     ((__type *)(((char *)(__item)) - offsetof(__type, __field)))
 
+#define LIST_IS_EMPTY(__list)                   \
+    ((__list)->next == (__list))
+
 
 #endif /*_U_DOUBLE_LIST_H_*/