Signed-off-by: Lai Jiangshan <[email protected]>
---
rculfhash.c | 24 +++++++++++++++++++++++-
urcu/rculfhash.h | 14 ++++++++++++++
2 files changed, 37 insertions(+), 1 deletions(-)
diff --git a/rculfhash.c b/rculfhash.c
index cbfc79e..70f5863 100644
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -1495,12 +1495,34 @@ void cds_lfht_add(struct cds_lfht *ht, unsigned long
hash,
{
unsigned long size;
- node->reverse_hash = bit_reverse_ulong((unsigned long) hash);
+ node->reverse_hash = bit_reverse_ulong(hash);
size = rcu_dereference(ht->t.size);
_cds_lfht_add(ht, NULL, NULL, size, node, NULL, 0);
ht_count_add(ht, size, hash);
}
+bool cds_lfht_add_at(struct cds_lfht *ht, struct cds_lfht_iter *iter,
+ unsigned long hash, struct cds_lfht_node *node)
+{
+ struct cds_lfht_node *new_node;
+
+ if (caa_unlikely(is_removed(iter->next)))
+ return false;
+
+ node->reverse_hash = bit_reverse_ulong(hash);
+ node->next = clear_flag(iter->next);
+ if (is_bucket(iter->next))
+ new_node = flag_bucket(node);
+ else
+ new_node = node;
+ if (uatomic_cmpxchg(&iter->node->next, iter->next,
+ new_node) != iter->next)
+ return false;
+
+ ht_count_add(ht, rcu_dereference(ht->t.size), hash);
+ return true;
+}
+
struct cds_lfht_node *cds_lfht_add_unique(struct cds_lfht *ht,
unsigned long hash,
cds_lfht_match_fct match,
diff --git a/urcu/rculfhash.h b/urcu/rculfhash.h
index 7d919d0..0f9bf44 100644
--- a/urcu/rculfhash.h
+++ b/urcu/rculfhash.h
@@ -250,6 +250,20 @@ void cds_lfht_add(struct cds_lfht *ht, unsigned long hash,
struct cds_lfht_node *node);
/*
+ * cds_lfht_add_at - add a node to the hash table at the specified place.
+ * @ht: the hash table.
+ * @iter: the specified place to insert
+ * @hash: the key hash.
+ * @node: the node to add.
+ *
+ * This function supports adding redundant keys into the table.
+ * Call with rcu_read_lock held.
+ * Threads calling this API need to be registered RCU read-side threads.
+ */
+bool cds_lfht_add_at(struct cds_lfht *ht, struct cds_lfht_iter *iter,
+ unsigned long hash, struct cds_lfht_node *node);
+
+/*
* cds_lfht_add_unique - add a node to hash table, if key is not present.
* @ht: the hash table.
* @hash: the node's hash.
--
1.7.4.4
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