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radix_tree: add radix_tree_uniq_insert

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When using radix_tree to identify duplicate entries we may
avoid to call an extra 'lookup()' prior the insert() operation
add radix_tree_uniq_insert/_ptr() that is able to report -1 if
there was already set a value for the given key.
This commit is contained in:
Zdenek Kabelac 2024-10-24 14:04:07 +02:00
parent dd856edaab
commit 5b1ebed3fc
2 changed files with 17 additions and 0 deletions
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7
base/data-struct/radix-tree-adaptive.c
View File

@ -564,6 +564,13 @@ bool radix_tree_insert(struct radix_tree *rt, const void *key, size_t keylen, un
return _insert(rt, lr.v, lr.kb, ke, rv);
}
int radix_tree_uniq_insert(struct radix_tree *rt, const void *key, size_t keylen, union radix_value rv)
{
unsigned entries = rt->nr_entries;
return radix_tree_insert(rt, key, keylen, rv) ?
((entries != rt->nr_entries) ? 1 : -1) : 0;
}
// Note the degrade functions also free the original node.
static void _degrade_to_n4(struct node16 *n16, struct value *result)
{

10
base/data-struct/radix-tree.h
View File

@ -35,6 +35,10 @@ void radix_tree_destroy(struct radix_tree *rt);
unsigned radix_tree_size(struct radix_tree *rt);
bool radix_tree_insert(struct radix_tree *rt, const void *key, size_t keylen, union radix_value v);
bool radix_tree_remove(struct radix_tree *rt, const void *key, size_t keylen);
// Returns: 1 success
// 0 failure during insert
// -1 key had already existing value (that was updated)
int radix_tree_uniq_insert(struct radix_tree *rt, const void *key, size_t keylen, union radix_value v);
// Returns the number of values removed
unsigned radix_tree_remove_prefix(struct radix_tree *rt, const void *prefix, size_t prefix_len);
@ -78,6 +82,12 @@ static inline bool radix_tree_insert_ptr(struct radix_tree *rt, const void *key,
union radix_value v = { .ptr = ptr };
return radix_tree_insert(rt, key, keylen, v);
}
static inline int radix_tree_uniq_insert_ptr(struct radix_tree *rt, const void *key, size_t keylen, void *ptr)
{
union radix_value v = { .ptr = ptr };
return radix_tree_uniq_insert(rt, key, keylen, v);
}
//----------------------------------------------------------------
#endif