X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=urcu%2Frcuhlist.h;h=b07c66b65ff1ccd33621f08e054594c375127bd7;hb=refs%2Fheads%2Furcu%2Frcuja-range;hp=36da15bc31d95394420a6958c05a5435927b1c2b;hpb=6734fec18ba760c816a32750cbb851414ef899e4;p=userspace-rcu.git

diff --git a/urcu/rcuhlist.h b/urcu/rcuhlist.h
index 36da15b..b07c66b 100644
--- a/urcu/rcuhlist.h
+++ b/urcu/rcuhlist.h
@@ -36,10 +36,9 @@ void cds_hlist_add_head_rcu(struct cds_hlist_node *newp,
 {
 	newp->next = head->next;
 	newp->prev = (struct cds_hlist_node *)head;
-	cmm_smp_wmb();
 	if (head->next)
 		head->next->prev = newp;
-	head->next = newp;
+	rcu_assign_pointer(head->next, newp);
 }
 
 /* Remove element from list. */
@@ -48,13 +47,37 @@ void cds_hlist_del_rcu(struct cds_hlist_node *elem)
 {
 	if (elem->next)
 		elem->next->prev = elem->prev;
-	elem->prev->next = elem->next;
+	CMM_STORE_SHARED(elem->prev->next, elem->next);
 }
 
+/*
+ * Get first element from a RCU hlist. Assumes the hlist is not empty.
+ * This must be done while rcu_read_lock() is held.
+ */
+#define cds_hlist_first_rcu(ptr, type) \
+	rcu_dereference((ptr)->next)
+
+/*
+ * Get first entry from a RCU hlist. Assumes the hlist is not empty.
+ * This must be done while rcu_read_lock() is held.
+ */
+#define cds_hlist_first_entry_rcu(ptr, type, member) \
+	cds_hlist_entry(rcu_dereference((ptr)->next), type, member)
+
 /*
  * Iterate through elements of the list.
  * This must be done while rcu_read_lock() is held.
  */
+#define cds_hlist_for_each_rcu(pos, head) \
+	for (pos = rcu_dereference((head)->next); pos != NULL; \
+		pos = rcu_dereference(pos->next))
+
+/*
+ * cds_hlist_for_each_entry_rcu takes 4 arguments, while the Linux
+ * kernel API only takes 3.
+ * We implement cds_hlist_for_each_entry_rcu_2() to follow the Linux
+ * kernel APIs.
+ */
 #define cds_hlist_for_each_entry_rcu(entry, pos, head, member) \
 	for (pos = rcu_dereference((head)->next), \
 			entry = cds_hlist_entry(pos, __typeof__(*entry), member); \
@@ -62,4 +85,11 @@ void cds_hlist_del_rcu(struct cds_hlist_node *elem)
 		pos = rcu_dereference(pos->next), \
 			entry = cds_hlist_entry(pos, __typeof__(*entry), member))
 
+#define cds_hlist_for_each_entry_rcu_2(entry, head, member) \
+	for (entry = cds_hlist_entry(rcu_dereference((head)->next), \
+			__typeof__(*entry), member); \
+		&entry->member != NULL; \
+		entry = cds_hlist_entry(rcu_dereference(entry->member.next), \
+			__typeof__(*entry), member))
+
 #endif	/* _URCU_RCUHLIST_H */