+#define URCU_WAIT_NODE_INIT(name, _state) \
+ { .state = _state }
+
+#define DEFINE_URCU_WAIT_NODE(name, state) \
+ struct urcu_wait_node name = URCU_WAIT_NODE_INIT(name, state)
+
+#define DECLARE_URCU_WAIT_NODE(name) \
+ struct urcu_wait_node name
+
+struct urcu_wait_queue {
+ struct cds_wfs_stack stack;
+};
+
+#define URCU_WAIT_QUEUE_HEAD_INIT(name) \
+ { .stack.head = CDS_WFS_END, .stack.lock = PTHREAD_MUTEX_INITIALIZER }
+
+#define DECLARE_URCU_WAIT_QUEUE(name) \
+ struct urcu_wait_queue name
+
+#define DEFINE_URCU_WAIT_QUEUE(name) \
+ struct urcu_wait_queue name = URCU_WAIT_QUEUE_HEAD_INIT(name)
+
+struct urcu_waiters {
+ struct cds_wfs_head *head;
+};
+
+/*
+ * Add ourself atomically to a wait queue. Return 0 if queue was
+ * previously empty, else return 1.
+ * A full memory barrier is issued before being added to the wait queue.
+ */
+static inline
+bool urcu_wait_add(struct urcu_wait_queue *queue,
+ struct urcu_wait_node *node)
+{
+ return cds_wfs_push(&queue->stack, &node->node);
+}
+
+/*
+ * Atomically move all waiters from wait queue into our local struct
+ * urcu_waiters.
+ */
+static inline
+void urcu_move_waiters(struct urcu_waiters *waiters,
+ struct urcu_wait_queue *queue)
+{
+ waiters->head = __cds_wfs_pop_all(&queue->stack);
+}
+
+static inline
+void urcu_wait_set_state(struct urcu_wait_node *node,
+ enum urcu_wait_state state)
+{
+ node->state = state;
+}
+