rculfhash: update add_unique api

[urcu.git] / rculfhash.c

diff --git a/rculfhash.c b/rculfhash.c
index 1ccd3f15a5b8be89b8ca4fce5b34f1e588e9473e..556ec36ddab261625d3c3b412496718c790d0c0b 100644 (file)
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -234,14 +234,16 @@ void _ht_gc_bucket(struct rcu_ht_node *dummy, struct rcu_ht_node *node)
 }
 
 static
-int _ht_add(struct rcu_ht *ht, struct rcu_table *t, struct rcu_ht_node *node,
-            int unique)
+struct rcu_ht_node *_ht_add(struct rcu_ht *ht, struct rcu_table *t,
+                           struct rcu_ht_node *node, int unique)
 {
        struct rcu_ht_node *iter_prev, *dummy, *iter, *next;
        unsigned long hash;
 
-       if (!t->size)
-               return 0;
+       if (!t->size) {
+               assert(node->dummy);
+               return node;    /* Initial first add (head) */
+       }
        hash = bit_reverse_ulong(node->reverse_hash);
        for (;;) {
                uint32_t chain_len = 0;
@@ -267,7 +269,7 @@ int _ht_add(struct rcu_ht *ht, struct rcu_table *t, struct rcu_ht_node *node,
                            && !ht->compare_fct(node->key, node->key_len,
                                                clear_flag(iter)->key,
                                                clear_flag(iter)->key_len))
-                               return -EEXIST;
+                               return clear_flag(iter);
                        /* Only account for identical reverse hash once */
                        if (iter_prev->reverse_hash != clear_flag(iter)->reverse_hash)
                                check_resize(ht, t, ++chain_len);
@@ -293,7 +295,7 @@ gc_end:
        /* Garbage collect logically removed nodes in the bucket */
        dummy = rcu_dereference(t->tbl[hash & (t->size - 1)]);
        _ht_gc_bucket(dummy, node);
-       return 0;
+       return node;
 }
 
 static
@@ -423,7 +425,7 @@ void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node)
        (void) _ht_add(ht, t, node, 0);
 }
 
-int ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node)
+struct rcu_ht_node *ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node)
 {
        struct rcu_table *t;
        unsigned long hash;