Fix: handle sys_futex() FUTEX_WAIT interrupted by signal

[urcu.git] / urcu / rcuhlist.h

diff --git a/urcu/rcuhlist.h b/urcu/rcuhlist.h
index 6d88692e854faf51a4105a8c7d46baa5c624e6c6..69c4d3184fd50d7f38a730e17447678f5fec3991 100644 (file)
--- a/urcu/rcuhlist.h
+++ b/urcu/rcuhlist.h
@@ -54,6 +54,16 @@ void cds_hlist_del_rcu(struct cds_hlist_node *elem)
  * 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); \
@@ -61,4 +71,11 @@ 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 */