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-rw-r--r--lib/rbtree_test.c58
1 files changed, 44 insertions, 14 deletions
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index 66e41d4..e28345d 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -61,35 +61,65 @@ static inline u32 augment_recompute(struct test_node *node)
return max;
}
-static void augment_callback(struct rb_node *rb, void *unused)
+static void augment_propagate(struct rb_node *rb, struct rb_node *stop)
{
- struct test_node *node = rb_entry(rb, struct test_node, rb);
- node->augmented = augment_recompute(node);
+ while (rb != stop) {
+ struct test_node *node = rb_entry(rb, struct test_node, rb);
+ u32 augmented = augment_recompute(node);
+ if (node->augmented == augmented)
+ break;
+ node->augmented = augmented;
+ rb = rb_parent(&node->rb);
+ }
+}
+
+static void augment_copy(struct rb_node *rb_old, struct rb_node *rb_new)
+{
+ struct test_node *old = rb_entry(rb_old, struct test_node, rb);
+ struct test_node *new = rb_entry(rb_new, struct test_node, rb);
+ new->augmented = old->augmented;
}
+static void augment_rotate(struct rb_node *rb_old, struct rb_node *rb_new)
+{
+ struct test_node *old = rb_entry(rb_old, struct test_node, rb);
+ struct test_node *new = rb_entry(rb_new, struct test_node, rb);
+
+ /* Rotation doesn't change subtree's augmented value */
+ new->augmented = old->augmented;
+ old->augmented = augment_recompute(old);
+}
+
+static const struct rb_augment_callbacks augment_callbacks = {
+ augment_propagate, augment_copy, augment_rotate
+};
+
static void insert_augmented(struct test_node *node, struct rb_root *root)
{
- struct rb_node **new = &root->rb_node, *parent = NULL;
+ struct rb_node **new = &root->rb_node, *rb_parent = NULL;
u32 key = node->key;
+ u32 val = node->val;
+ struct test_node *parent;
while (*new) {
- parent = *new;
- if (key < rb_entry(parent, struct test_node, rb)->key)
- new = &parent->rb_left;
+ rb_parent = *new;
+ parent = rb_entry(rb_parent, struct test_node, rb);
+ if (parent->augmented < val)
+ parent->augmented = val;
+ if (key < parent->key)
+ new = &parent->rb.rb_left;
else
- new = &parent->rb_right;
+ new = &parent->rb.rb_right;
}
- rb_link_node(&node->rb, parent, new);
- rb_insert_color(&node->rb, root);
- rb_augment_insert(&node->rb, augment_callback, NULL);
+ node->augmented = val;
+ rb_link_node(&node->rb, rb_parent, new);
+ rb_insert_augmented(&node->rb, root, &augment_callbacks);
}
static void erase_augmented(struct test_node *node, struct rb_root *root)
{
- struct rb_node *deepest = rb_augment_erase_begin(&node->rb);
- rb_erase(&node->rb, root);
- rb_augment_erase_end(deepest, augment_callback, NULL);
+ rb_erase_augmented(&node->rb, root, &augment_callbacks);
}
static void init(void)
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