-#ifndef _LINUX_LIST_H
-#define _LINUX_LIST_H
+/*-
+ * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2010 iX Systems, Inc.
+ * Copyright (c) 2010 Panasas, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _LINUX_LIST_H_
+#define _LINUX_LIST_H_
#include <stddef.h>
-/**
- * container_of - cast a member of a structure out to the containing structure
- * @ptr: the pointer to the member.
- * @type: the type of the container struct this is embedded in.
- * @member: the name of the member within the struct.
- *
- */
-#ifndef container_of
-#define container_of(ptr, type, member) ( \
- (type *)( (char *)ptr - offsetof(type,member) ))
-#endif
+#include <stdbool.h>
+#define prefetch(x)
-/*
- * Simple doubly linked list implementation.
- *
- * Some of the internal functions ("__xxx") are useful when
- * manipulating whole lists rather than single entries, as
- * sometimes we already know the next/prev entries and we can
- * generate better code by using them directly rather than
- * using the generic single-entry routines.
- */
+#ifndef container_of
+#define container_of(ptr, type, member) ( \
+ (type *)( (char *)ptr - offsetof(type,member) ))
+#endif
struct list_head {
- struct list_head *next, *prev;
+ struct list_head *next;
+ struct list_head *prev;
};
#define LIST_HEAD_INIT(name) { &(name), &(name) }
+#define LIST_HEAD(name) struct list_head name = LIST_HEAD_INIT(name)
-#define LIST_HEAD(name) \
- struct list_head name = LIST_HEAD_INIT(name)
-
-static inline void INIT_LIST_HEAD(struct list_head *list)
+static inline void
+INIT_LIST_HEAD(struct list_head *list)
{
- list->next = list;
- list->prev = list;
+ list->next = list->prev = list;
}
-/*
- * Insert a new entry between two known consecutive entries.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_add(struct list_head *_new,
- struct list_head *prev,
- struct list_head *next)
+static inline bool
+list_empty(const struct list_head *head)
{
- next->prev = _new;
- _new->next = next;
- _new->prev = prev;
- prev->next = _new;
+ return (head->next == head);
}
-/**
- * list_add - add a new entry
- * @_new: new entry to be added
- * @head: list head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-static inline void list_add(struct list_head *_new, struct list_head *head)
+static inline bool
+list_is_first(const struct list_head *list,
+ const struct list_head *head)
{
- __list_add(_new, head, head->next);
+ return list->prev == head;
}
-
-/**
- * list_add_tail - add a new entry
- * @_new: new entry to be added
- * @head: list head to add it before
- *
- * Insert a new entry before the specified head.
- * This is useful for implementing queues.
- */
-static inline void list_add_tail(struct list_head *_new, struct list_head *head)
+static inline bool
+list_is_last(const struct list_head *list,
+ const struct list_head *head)
{
- __list_add(_new, head->prev, head);
+ return list->next == head;
}
-
-/*
- * Delete a list entry by making the prev/next entries
- * point to each other.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_del(struct list_head * prev, struct list_head * next)
+static inline void
+_list_del(struct list_head *entry)
{
- next->prev = prev;
- prev->next = next;
+ entry->next->prev = entry->prev;
+ entry->prev->next = entry->next;
}
-/**
- * list_del - deletes entry from list.
- * @entry: the element to delete from the list.
- * Note: list_empty() on entry does not return true after this, the entry is
- * in an undefined state.
- */
-static inline void list_del(struct list_head *entry)
+static inline void
+list_del(struct list_head *entry)
{
- __list_del(entry->prev, entry->next);
- entry->next = NULL;
- entry->prev = NULL;
+ _list_del(entry);
+ entry->next = entry->prev = NULL;
}
-/**
- * list_replace - replace old entry by new one
- * @old : the element to be replaced
- * @_new : the new element to insert
- *
- * If @old was empty, it will be overwritten.
- */
-static inline void list_replace(struct list_head *old,
- struct list_head *_new)
+static inline void
+_list_add(struct list_head *_new, struct list_head *prev,
+ struct list_head *next)
{
- _new->next = old->next;
- _new->next->prev = _new;
- _new->prev = old->prev;
- _new->prev->next = _new;
-}
-static inline void list_replace_init(struct list_head *old,
- struct list_head *_new)
-{
- list_replace(old, _new);
- INIT_LIST_HEAD(old);
+ next->prev = _new;
+ _new->next = next;
+ _new->prev = prev;
+ prev->next = _new;
}
-/**
- * list_del_init - deletes entry from list and reinitialize it.
- * @entry: the element to delete from the list.
- */
-static inline void list_del_init(struct list_head *entry)
+static inline void
+list_del_init(struct list_head *entry)
{
- __list_del(entry->prev, entry->next);
+ _list_del(entry);
INIT_LIST_HEAD(entry);
}
-/**
- * list_move - delete from one list and add as another's head
- * @list: the entry to move
- * @head: the head that will precede our entry
- */
-static inline void list_move(struct list_head *list, struct list_head *head)
-{
- __list_del(list->prev, list->next);
- list_add(list, head);
-}
+#define list_entry(ptr, type, field) container_of(ptr, type, field)
+#define list_first_entry(ptr, type, field) list_entry((ptr)->next, type, field)
+#define list_last_entry(ptr, type, field) list_entry((ptr)->prev, type, field)
-/**
- * list_move_tail - delete from one list and add as another's tail
- * @list: the entry to move
- * @head: the head that will follow our entry
- */
-static inline void list_move_tail(struct list_head *list,
- struct list_head *head)
-{
- __list_del(list->prev, list->next);
- list_add_tail(list, head);
-}
+#define list_for_each(p, head) \
+ for (p = (head)->next; p != (head); p = p->next)
-/**
- * list_is_first - tests whether @list is the first entry in list @head
- * @list: the entry to test
- * @head: the head of the list
- */
-static inline int list_is_first(const struct list_head *list,
- const struct list_head *head)
+#define list_for_each_safe(p, n, head) \
+ for (p = (head)->next, n = p->next; p != (head); p = n, n = p->next)
+
+#define list_for_each_entry(p, h, field) \
+ for (p = list_first_entry(h, typeof(*p), field); &p->field != (h); \
+ p = list_entry(p->field.next, typeof(*p), field))
+
+#define list_for_each_entry_safe(p, n, h, field) \
+ for (p = list_first_entry(h, typeof(*p), field), \
+ n = list_entry(p->field.next, typeof(*p), field); &p->field != (h);\
+ p = n, n = list_entry(n->field.next, typeof(*n), field))
+
+#define list_for_each_entry_reverse(p, h, field) \
+ for (p = list_last_entry(h, typeof(*p), field); &p->field != (h); \
+ p = list_entry(p->field.prev, typeof(*p), field))
+
+#define list_for_each_prev(p, h) for (p = (h)->prev; p != (h); p = p->prev)
+#define list_for_each_prev_safe(p, n, h) for (p = (h)->prev, n = p->prev; p != (h); p = n, n = p->prev)
+
+static inline void
+list_add(struct list_head *_new, struct list_head *head)
{
- return list->prev == head;
+ _list_add(_new, head, head->next);
}
-/**
- * list_is_last - tests whether @list is the last entry in list @head
- * @list: the entry to test
- * @head: the head of the list
- */
-static inline int list_is_last(const struct list_head *list,
- const struct list_head *head)
+static inline void
+list_add_tail(struct list_head *_new, struct list_head *head)
{
- return list->next == head;
+ _list_add(_new, head->prev, head);
}
-/**
- * list_empty - tests whether a list is empty
- * @head: the list to test.
- */
-static inline int list_empty(const struct list_head *head)
+static inline void
+list_move(struct list_head *list, struct list_head *head)
{
- return head->next == head;
+ _list_del(list);
+ list_add(list, head);
}
-/**
- * list_empty_careful - tests whether a list is empty and not being modified
- * @head: the list to test
- *
- * Description:
- * tests whether a list is empty _and_ checks that no other CPU might be
- * in the process of modifying either member (next or prev)
- *
- * NOTE: using list_empty_careful() without synchronization
- * can only be safe if the only activity that can happen
- * to the list entry is list_del_init(). Eg. it cannot be used
- * if another CPU could re-list_add() it.
- */
-static inline int list_empty_careful(const struct list_head *head)
+static inline void
+list_move_tail(struct list_head *entry, struct list_head *head)
{
- struct list_head *next = head->next;
- return (next == head) && (next == head->prev);
+ _list_del(entry);
+ list_add_tail(entry, head);
}
-static inline void __list_splice(struct list_head *list,
- struct list_head *head)
+static inline void
+_list_splice(const struct list_head *list, struct list_head *prev,
+ struct list_head *next)
{
- struct list_head *first = list->next;
- struct list_head *last = list->prev;
- struct list_head *at = head->next;
+ struct list_head *first;
+ struct list_head *last;
- first->prev = head;
- head->next = first;
+ if (list_empty(list))
+ return;
- last->next = at;
- at->prev = last;
+ first = list->next;
+ last = list->prev;
+ first->prev = prev;
+ prev->next = first;
+ last->next = next;
+ next->prev = last;
}
-/**
- * list_splice - join two lists
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-static inline void list_splice(struct list_head *list, struct list_head *head)
+static inline void
+list_splice(const struct list_head *list, struct list_head *head)
{
- if (!list_empty(list))
- __list_splice(list, head);
+ _list_splice(list, head, head->next);
}
-/**
- * list_splice_init - join two lists and reinitialise the emptied list.
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- *
- * The list at @list is reinitialised
- */
-static inline void list_splice_init(struct list_head *list,
- struct list_head *head)
+static inline void
+list_splice_tail(struct list_head *list, struct list_head *head)
{
- if (!list_empty(list)) {
- __list_splice(list, head);
- INIT_LIST_HEAD(list);
- }
+ _list_splice(list, head->prev, head);
}
-/**
- * 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_first_entry - get the first element from a list
- * @ptr: the list head to take the element from.
- * @type: the type of the struct this is embedded in.
- * @member: the name of the list_struct within the struct.
- *
- * Note, that list is expected to be not empty.
- */
-#define list_first_entry(ptr, type, member) \
- list_entry((ptr)->next, type, member)
-
-/**
- * list_for_each - iterate over a list
- * @pos: the &struct list_head to use as a loop cursor.
- * @head: the head for your list.
- */
-#define list_for_each(pos, head) \
- for (pos = (head)->next; pos != (head); \
- pos = pos->next)
-
-/**
- * __list_for_each - iterate over a list
- * @pos: the &struct list_head to use as a loop cursor.
- * @head: the head for your list.
- *
- * This variant differs from list_for_each() in that it's the
- * simplest possible list iteration code, no prefetching is done.
- * Use this for code that knows the list to be very short (empty
- * or 1 entry) most of the time.
- */
-#define __list_for_each(pos, head) \
- for (pos = (head)->next; pos != (head); pos = pos->next)
+static inline void
+list_splice_init(struct list_head *list, struct list_head *head)
+{
+ _list_splice(list, head, head->next);
+ INIT_LIST_HEAD(list);
+}
-/**
- * list_for_each_prev - iterate over a list backwards
- * @pos: the &struct list_head to use as a loop cursor.
- * @head: the head for your list.
- */
-#define list_for_each_prev(pos, head) \
- for (pos = (head)->prev; pos != (head); \
- pos = pos->prev)
-
-/**
- * list_for_each_safe - iterate over a list safe against removal of list entry
- * @pos: the &struct list_head to use as a loop cursor.
- * @n: another &struct list_head to use as temporary storage
- * @head: the head for your list.
- */
-#define list_for_each_safe(pos, n, head) \
- for (pos = (head)->next, n = pos->next; pos != (head); \
- pos = n, n = pos->next)
-
-/**
- * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
- * @pos: the &struct list_head to use as a loop cursor.
- * @n: another &struct list_head to use as temporary storage
- * @head: the head for your list.
- */
-#define list_for_each_prev_safe(pos, n, head) \
- for (pos = (head)->prev, n = pos->prev; \
- pos != (head); \
- pos = n, n = pos->prev)
-
-/**
- * list_for_each_entry - iterate over list of given type
- * @pos: the type * to use as a loop cursor.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry(pos, head, member) \
- for (pos = list_entry((head)->next, typeof(*pos), member); \
- &pos->member != (head); \
- pos = list_entry(pos->member.next, typeof(*pos), member))
-
-/**
- * list_for_each_entry_reverse - iterate backwards over list of given type.
- * @pos: the type * to use as a loop cursor.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_reverse(pos, head, member) \
- for (pos = list_entry((head)->prev, typeof(*pos), member); \
- &pos->member != (head); \
- pos = list_entry(pos->member.prev, typeof(*pos), member))
-
-/**
- * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
- * @pos: the type * to use as a start point
- * @head: the head of the list
- * @member: the name of the list_struct within the struct.
- *
- * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
- */
-#define list_prepare_entry(pos, head, member) \
- ((pos) ? : list_entry(head, typeof(*pos), member))
-
-/**
- * list_for_each_entry_continue - continue iteration over list of given type
- * @pos: the type * to use as a loop cursor.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Continue to iterate over list of given type, continuing after
- * the current position.
- */
-#define list_for_each_entry_continue(pos, head, member) \
- for (pos = list_entry(pos->member.next, typeof(*pos), member); \
- &pos->member != (head); \
- pos = list_entry(pos->member.next, typeof(*pos), member))
-
-/**
- * list_for_each_entry_continue_reverse - iterate backwards from the given point
- * @pos: the type * to use as a loop cursor.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Start to iterate over list of given type backwards, continuing after
- * the current position.
- */
-#define list_for_each_entry_continue_reverse(pos, head, member) \
- for (pos = list_entry(pos->member.prev, typeof(*pos), member); \
- &pos->member != (head); \
- pos = list_entry(pos->member.prev, typeof(*pos), member))
-
-/**
- * list_for_each_entry_from - iterate over list of given type from the current point
- * @pos: the type * to use as a loop cursor.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Iterate over list of given type, continuing from current position.
- */
-#define list_for_each_entry_from(pos, head, member) \
- for (; &pos->member != (head); \
- pos = list_entry(pos->member.next, typeof(*pos), member))
-
-/**
- * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
- * @pos: the type * to use as a loop cursor.
- * @n: another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_safe(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))
-
-/**
- * list_for_each_entry_safe_continue
- * @pos: the type * to use as a loop cursor.
- * @n: another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Iterate over list of given type, continuing after current point,
- * safe against removal of list entry.
- */
-#define list_for_each_entry_safe_continue(pos, n, head, member) \
- for (pos = list_entry(pos->member.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))
-
-/**
- * list_for_each_entry_safe_from
- * @pos: the type * to use as a loop cursor.
- * @n: another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Iterate over list of given type from current point, safe against
- * removal of list entry.
- */
-#define list_for_each_entry_safe_from(pos, n, head, member) \
- for (n = list_entry(pos->member.next, typeof(*pos), member); \
- &pos->member != (head); \
- pos = n, n = list_entry(n->member.next, typeof(*n), member))
-
-/**
- * list_for_each_entry_safe_reverse
- * @pos: the type * to use as a loop cursor.
- * @n: another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- *
- * Iterate backwards over list of given type, safe against removal
- * of list entry.
- */
-#define list_for_each_entry_safe_reverse(pos, n, head, member) \
- for (pos = list_entry((head)->prev, typeof(*pos), member), \
- n = list_entry(pos->member.prev, typeof(*pos), member); \
- &pos->member != (head); \
- pos = n, n = list_entry(n->member.prev, typeof(*n), member))
+static inline void
+list_splice_tail_init(struct list_head *list, struct list_head *head)
+{
+ _list_splice(list, head->prev, head);
+ INIT_LIST_HEAD(list);
+}
-#endif
+#endif /* _LINUX_LIST_H_ */
projects / oweals / libubox.git / commitdiff