diff --git a/lib/iqueue.h b/lib/iqueue.h
index ca1beee2e..2fcfb577b 100644
--- a/lib/iqueue.h
+++ b/lib/iqueue.h
@@ -27,6 +27,7 @@
 					ele_type *next; \
 				} link; \
 			} *offset; \
+			const ele_type *const_ele; \
 		}; \
 	}
 
@@ -79,9 +80,73 @@
 } while (0)
 
 
+#define i_queue_push_head(list, ele) do { \
+	if ((list)->head) { \
+		__auto_type __link = (__typeof((list)->offset)) (list)->head; \
+		__link->link.prev = ele; \
+	} \
+	__auto_type __link = (__typeof((list)->offset)) ele; \
+	__link->link.next = (list)->head; \
+	(list)->head = ele; \
+	if (!(list)->tail) \
+		(list)->tail = ele; \
+	(list)->length++; \
+} while (0)
+
+
+#define i_queue_delete(list, ele) do { \
+	__auto_type __link = (__typeof((list)->offset)) ele; \
+	if (__link->link.next) { \
+		__auto_type __next_link = (__typeof((list)->offset)) __link->link.next; \
+		__next_link->link.prev = __link->link.prev; \
+	} \
+	else \
+		(list)->tail = __link->link.prev; \
+	if (__link->link.prev) { \
+		__auto_type __prev_link = (__typeof((list)->offset)) __link->link.prev; \
+		__prev_link->link.next = __link->link.next; \
+	} \
+	else \
+		(list)->head = __link->link.next; \
+} while (0)
+
+
 #define IQUEUE_FOREACH(list, var) \
 	for (__typeof__ ( ({ __typeof__ (*(list)->head) __t; &__t; }) ) var = (list)->head; \
 			var; var = ((__typeof((list)->offset)) var)->link.next)
 
 
+#define IQUEUE_FOREACH_SAFE_DECL(list, var) \
+	__typeof__ ( ({ __typeof__ (*(list)->head) __t; &__t; }) ) var, __next ## var \
+
+
+#define IQUEUE_FOREACH_SAFE(list, var) \
+	for (var = (list)->head, \
+				__next ## var = var ? ((__typeof((list)->offset)) var)->link.next : NULL; \
+			var; \
+			var = __next ## var, \
+				__next ## var = var ? ((__typeof((list)->offset)) var)->link.next : NULL)
+
+
+#define i_queue_clear_full(list, fn) do { \
+	IQUEUE_FOREACH_SAFE_DECL(list, __ele); \
+	IQUEUE_FOREACH_SAFE(list, __ele) \
+		(fn)(__ele); \
+	i_queue_init(list); \
+} while (0)
+
+
+#define i_queue_find(list, fn) ({ \
+	 __typeof__ ((list)->head) __ret = NULL; \
+	 bool (*__fn)(__typeof__ ((list)->const_ele)) = (fn); \
+	 IQUEUE_FOREACH(list, __ele) { \
+	 	if (__fn(__ele)) { \
+			__ret = __ele; \
+			break; \
+		} \
+	} \
+	__ret; \
+})
+
+
 #endif