X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=urcu%2Frculfstack.h;h=a33fcb1a7eaa29a7d80b798906c84b6303048623;hb=b6a37eaca5f072e7bba90a2562b7f2ac238fe23b;hp=a9e624ce792ee2b59ecb648084df5cda73a60e46;hpb=c3f74cb2ea6f1e395b2d0352ee6c62367144688c;p=userspace-rcu.git

diff --git a/urcu/rculfstack.h b/urcu/rculfstack.h
index a9e624c..a33fcb1 100644
--- a/urcu/rculfstack.h
+++ b/urcu/rculfstack.h
@@ -23,8 +23,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#if (!defined(_GNU_SOURCE) && !defined(_LGPL_SOURCE))
-#error "Dynamic loader LGPL wrappers not implemented yet"
+#ifdef __cplusplus
+extern "C" {
 #endif
 
 struct rcu_lfs_node {
@@ -35,68 +35,32 @@ struct rcu_lfs_stack {
 	struct rcu_lfs_node *head;
 };
 
-void rcu_lfs_node_init(struct rcu_lfs_node *node)
-{
-}
+#ifdef _LGPL_SOURCE
 
-void rcu_lfs_init(struct rcu_lfs_stack *s)
-{
-	s->head = NULL;
-}
+#include <urcu/rculfstack-static.h>
 
-void rcu_lfs_push(struct rcu_lfs_stack *s, struct rcu_lfs_node *node)
-{
-	for (;;) {
-		struct rcu_lfs_node *head;
+#define rcu_lfs_node_init	_rcu_lfs_node_init
+#define rcu_lfs_init		_rcu_lfs_init
+#define rcu_lfs_push		_rcu_lfs_push
+#define rcu_lfs_pop		_rcu_lfs_pop
 
-		rcu_read_lock();
-		head = rcu_dereference(s->head);
-		node->next = head;
-		/*
-		 * uatomic_cmpxchg() implicit memory barrier orders earlier
-		 * stores to node before publication.
-		 */
-		if (uatomic_cmpxchg(&s->head, head, node) == head) {
-			rcu_read_unlock();
-			return;
-		} else {
-			/* Failure to prepend. Retry. */
-			rcu_read_unlock();
-			continue;
-		}
-	}
-}
+#else /* !_LGPL_SOURCE */
+
+extern void rcu_lfs_node_init(struct rcu_lfs_node *node);
+extern void rcu_lfs_init(struct rcu_lfs_stack *s);
+extern void rcu_lfs_push(struct rcu_lfs_stack *s, struct rcu_lfs_node *node);
 
 /*
  * The caller must wait for a grace period to pass before freeing the returned
- * node.
+ * node or modifying the rcu_lfs_node structure.
  * Returns NULL if stack is empty.
  */
-struct rcu_lfs_node *
-rcu_lfs_pop(struct rcu_lfs_stack *s)
-{
-	for (;;) {
-		struct rcu_lfs_node *head;
+extern struct rcu_lfs_node *rcu_lfs_pop(struct rcu_lfs_stack *s);
 
-		rcu_read_lock();
-		head = rcu_dereference(s->head);
-		if (head) {
-			struct rcu_lfs_node *next = rcu_dereference(head->next);
+#endif /* !_LGPL_SOURCE */
 
-			if (uatomic_cmpxchg(&s->head, head, next) == head) {
-				rcu_read_unlock();
-				return head;
-			} else {
-				/* Concurrent modification. Retry. */
-				rcu_read_unlock();
-				continue;
-			}
-		} else {
-			/* Empty stack */
-			rcu_read_unlock();
-			return NULL;
-		}
-	}
+#ifdef __cplusplus
 }
+#endif
 
 #endif /* _URCU_RCULFSTACK_H */