original files of m241

components/ip_net2-6.9/vxmux/include/vx_list.h

@@ -0,0 +1,80 @@
+/* vx_list.h - simple circular doubly-linked list type and macros */
+
+#ifndef VX_LIST_H
+#define VX_LIST_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct Circ_list_struct Circ_list;
+
+struct Circ_list_struct
+{
+    Circ_list * prev;
+    Circ_list * next;
+};
+
+/*
+ * CIRC_LIST_INIT(l) initializes the list node l as a list
+ * containing a single node (itself). Used for list heads/sentinels.
+ */
+#define CIRC_LIST_INIT(l) \
+    do  { \
+        Circ_list * l_ = (l); \
+	l_->prev = l_; \
+	l_->next = l_; \
+        } while ((0))
+
+/*
+ * CIRC_LIST_REMOVE(n) removes the node n from the list
+ * that it is in. (n must be in a list).
+ * n is left with dangling references to the list.
+ * If n is alone in the list, this is a no-op.
+ */
+#define CIRC_LIST_REMOVE(n) \
+    do  { \
+        Circ_list * n_ = (n); \
+	Circ_list * nxt_ = n_->next; \
+        n_->prev->next = nxt_; \
+        nxt_->prev = n_->prev; \
+        } while ((0))
+
+/*
+ * CIRC_LIST_INSERT_AFTER(l, n) inserts node n after node l
+ * in the list that l currently belongs to. n should
+ * be a free node.  If l represents the 'head' of the list
+ * rather than an 'item', this operation inserts n as the
+ * first item in list.
+ */
+#define CIRC_LIST_INSERT_AFTER(l, n) \
+    do  { \
+        Circ_list * l_ = (l); \
+        Circ_list * n_ = (n); \
+        n_->prev = l_; \
+	n_->next = l_->next; \
+	l_->next->prev = n_; \
+	l_->next = n_; \
+        } while ((0))
+
+/*
+ * CIRC_LIST_INSERT_BEFORE(l, n) inserts node n before node l
+ * in the list that l currently belongs to. n should
+ * be a free node.  If l represents the head of the list,
+ * this operation corresponds to inserting n at the tail.
+ */
+#define CIRC_LIST_INSERT_BEFORE(l, n) \
+    do  { \
+        Circ_list * l_ = (l); \
+        Circ_list * n_ = (n); \
+        n_->next = l_; \
+	n_->prev = l_->prev; \
+	l_->prev->next = n_; \
+	l_->prev = n_; \
+        } while ((0))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* VX_LIST_H */