X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=urcu%2Frculfhash.h;h=99b43a8ba0ec4b178b60f1e9491b7176a3204f1f;hb=cc4fcb1069347d2b5fbf71a61e7c1712df9a177a;hp=d671af3e35ecc9b0e57a7955902ac230e244c987;hpb=cb2337522f4a0a7f3200daff65c537482c67b434;p=urcu.git

diff --git a/urcu/rculfhash.h b/urcu/rculfhash.h
index d671af3..99b43a8 100644
--- a/urcu/rculfhash.h
+++ b/urcu/rculfhash.h
@@ -4,13 +4,22 @@
 #include <stdint.h>
 #include <urcu-call-rcu.h>
 
-struct rcu_ht_node {
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct _rcu_ht_node {
 	struct rcu_ht_node *next;
-	void *key;
-	size_t key_len;
-	unsigned long hash;
 	unsigned long reverse_hash;
 	unsigned int dummy;
+};
+
+struct rcu_ht_node {
+	/* cache-hot for iteration */
+	struct _rcu_ht_node p;          /* needs to be first field */
+	void *key;
+	unsigned int key_len;
+	/* cache-cold for iteration */
 	struct rcu_head head;
 };
 
@@ -32,7 +41,7 @@ void ht_node_init(struct rcu_ht_node *node, void *key,
 {
 	node->key = key;
 	node->key_len = key_len;
-	node->dummy = 0;
+	node->p.dummy = 0;
 }
 
 /*
@@ -46,6 +55,10 @@ struct rcu_ht *ht_new(ht_hash_fct hash_fct,
 				void (*func)(struct rcu_head *head)));
 
 int ht_destroy(struct rcu_ht *ht);
+/* Count the number of nodes in the hash table. Call with rcu_read_lock held. */
+void ht_count_nodes(struct rcu_ht *ht,
+		unsigned long *count,
+		unsigned long *removed);
 
 /* Call with rcu_read_lock held. */
 struct rcu_ht_node *ht_lookup(struct rcu_ht *ht, void *key, size_t key_len);
@@ -53,12 +66,21 @@ struct rcu_ht_node *ht_lookup(struct rcu_ht *ht, void *key, size_t key_len);
 /* Call with rcu_read_lock held. */
 void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node);
 
-/* Call with rcu_read_lock held. */
-int ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node);
+/*
+ * Call with rcu_read_lock held.
+ * Returns the node added upon success.
+ * Returns the unique node already present upon failure. If ht_add_unique fails,
+ * the node passed as parameter should be freed by the caller.
+ */
+struct rcu_ht_node *ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node);
 
 /* Call with rcu_read_lock held. */
 int ht_remove(struct rcu_ht *ht, struct rcu_ht_node *node);
 
 void ht_resize(struct rcu_ht *ht, int growth);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _URCU_RCULFHASH_H */