Add list_add_head to libcutils

Adds a node to the head of the linked list.

Change-Id: I03fc81f348c5c4fdab8680928b6e353413e4bc3c
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Yong Yao <yong.yao@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/cutils/list.h b/include/cutils/list.h
index 945729a..6e94ddf 100644
--- a/include/cutils/list.h
+++ b/include/cutils/list.h
@@ -63,6 +63,14 @@ static inline void list_add_tail(struct listnode *head, struct listnode *item)
     head->prev = item;
 }
 
+static inline void list_add_head(struct listnode *head, struct listnode *item)
+{
+    item->next = head->next;
+    item->prev = head;
+    head->next->prev = item;
+    head->next = item;
+}
+
 static inline void list_remove(struct listnode *item)
 {
     item->next->prev = item->prev;