+#include <pthread.h>
+#include <urcu/rculfhash.h>
+
+/* Never declared. Opaque type used to store flagged node pointers. */
+struct rcu_ja_node_flag;
+
+/*
+ * Shadow node contains mutex and call_rcu head associated with a node.
+ */
+struct rcu_ja_shadow_node {
+ struct cds_lfht_node ht_node; /* hash table node */
+ struct rcu_ja_node *node; /* reverse mapping and hash table key */
+ /*
+ * mutual exclusion on all nodes belonging to the same tree
+ * position (e.g. both nodes before and after recompaction
+ * use the same lock).
+ */
+ pthread_mutex_t *lock;
+ unsigned int nr_child; /* number of children in node */
+ struct rcu_head head; /* for deferred node and shadow node reclaim */
+};
+
+struct rcu_ja {
+ struct rcu_ja_node_flag *root;
+ /*
+ * We use a hash table to associate node keys to their
+ * respective shadow node. This helps reducing lookup hot path
+ * cache footprint, especially for very small nodes.
+ */
+ struct cds_lfht *ht;
+};
+
+__attribute__((visibility("protected")))
+struct rcu_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
+ struct rcu_ja_node *node);
+__attribute__((visibility("protected")))
+void rcuja_shadow_unlock(struct rcu_ja_shadow_node *shadow_node);
+__attribute__((visibility("protected")))
+int rcuja_shadow_set(struct cds_lfht *ht,
+ struct rcu_ja_node *new_node,
+ struct rcu_ja_shadow_node *inherit_from);
+__attribute__((visibility("protected")))
+
+/* rcuja_shadow_clear flags */
+enum {
+ RCUJA_SHADOW_CLEAR_FREE_NODE = (1U << 0),
+ RCUJA_SHADOW_CLEAR_FREE_LOCK = (1U << 1),
+};
+
+int rcuja_shadow_clear(struct cds_lfht *ht,
+ struct rcu_ja_node *node,
+ unsigned int flags);
+__attribute__((visibility("protected")))
+struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
+__attribute__((visibility("protected")))
+void rcuja_delete_ht(struct cds_lfht *ht);