Timer re-worked!

[lunaix-os.git] / lunaix-os / includes / lunaix / ds / llist.h

diff --git a/lunaix-os/includes/lunaix/ds/llist.h b/lunaix-os/includes/lunaix/ds/llist.h
new file mode 100644 (file)
index 0000000..effee95
--- /dev/null
+++ b/lunaix-os/includes/lunaix/ds/llist.h
@@ -0,0 +1,82 @@
+/**
+ * @file llist.h
+ * @author Lunaixsky
+ * @brief This doubly linked cyclic list is adopted from Linux kernel <linux/list.h>
+ * @version 0.1
+ * @date 2022-03-12
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#ifndef __LUNAIX_LLIST_H
+#define __LUNAIX_LLIST_H
+
+#include <lunaix/common.h>
+
+struct llist_header
+{
+    struct llist_header* prev;
+    struct llist_header* next;
+};
+
+static inline void
+__llist_add(struct llist_header* elem,
+            struct llist_header* prev,
+            struct llist_header* next)
+{
+    next->prev = elem;
+    elem->next = next;
+    elem->prev = prev;
+    prev->next = elem;
+}
+
+static inline void
+llist_init_head(struct llist_header* head) {
+    head->next = head;
+    head->prev = head;
+}
+
+static inline void
+llist_append(struct llist_header* head, struct llist_header* elem)
+{
+    __llist_add(elem, head, head->next);
+}
+
+static inline void
+llist_prepend(struct llist_header* head, struct llist_header* elem)
+{
+    __llist_add(elem, head->prev, head);
+}
+
+static inline void
+llist_delete(struct llist_header* elem) {
+    elem->prev->next = elem->next;
+    elem->next->prev = elem->next;
+    
+    // make elem orphaned
+    elem->prev = elem;
+    elem->next = elem;
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:       the &struct list_head pointer.
+ * @type:      the type of the struct this is embedded in.
+ * @member:    the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+       container_of(ptr, type, member)
+
+/**
+ * list_for_each_entry -       iterate over list of given type
+ * @pos:       the type * to use as a loop counter.
+ * @head:      the head for your list.
+ * @member:    the name of the list_struct within the struct.
+ */
+#define llist_for_each(pos, n, head, member)                               \
+       for (pos = list_entry((head)->next, typeof(*pos), member),      \
+               n = list_entry(pos->member.next, typeof(*pos), member); \
+            &pos->member != (head);                                                \
+            pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+#endif /* __LUNAIX_LLIST_H */