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glibc/include/list.h
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/* Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _LIST_H | |
#ifndef __need_list_t | |
# define _LIST_H 1 | |
#endif | |
/* The definitions of this file are adopted from those which can be | |
found in the Linux kernel headers to enable people familiar with | |
the latter find their way in these sources as well. */ | |
#if defined __need_list_t || defined _LIST_H | |
# ifndef __list_t_defined | |
# define __list_t_defined | |
/* Basic type for the double-link list. */ | |
typedef struct list_head | |
{ | |
struct list_head *next; | |
struct list_head *prev; | |
} list_t; | |
# endif | |
# undef __need_list_t | |
#endif | |
#ifdef _LIST_H | |
# include <atomic.h> | |
/* Define a variable with the head and tail of the list. */ | |
# define LIST_HEAD(name) \ | |
list_t name = { &(name), &(name) } | |
/* Initialize a new list head. */ | |
# define INIT_LIST_HEAD(ptr) \ | |
(ptr)->next = (ptr)->prev = (ptr) | |
/* Add new element at the head of the list. */ | |
static inline void | |
list_add (list_t *newp, list_t *head) | |
{ | |
newp->next = head->next; | |
newp->prev = head; | |
head->next->prev = newp; | |
atomic_write_barrier (); | |
head->next = newp; | |
} | |
/* Remove element from list. */ | |
static inline void | |
list_del (list_t *elem) | |
{ | |
elem->next->prev = elem->prev; | |
elem->prev->next = elem->next; | |
} | |
/* Join two lists. */ | |
static inline void | |
list_splice (list_t *add, list_t *head) | |
{ | |
/* Do nothing if the list which gets added is empty. */ | |
if (add != add->next) | |
{ | |
add->next->prev = head; | |
add->prev->next = head->next; | |
head->next->prev = add->prev; | |
head->next = add->next; | |
} | |
} | |
/* Get typed element from list at a given position. */ | |
# define list_entry(ptr, type, member) \ | |
((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member))) | |
/* Iterate forward over the elements of the list. */ | |
# define list_for_each(pos, head) \ | |
for (pos = (head)->next; pos != (head); pos = pos->next) | |
/* Iterate forward over the elements of the list. */ | |
# define list_for_each_prev(pos, head) \ | |
for (pos = (head)->prev; pos != (head); pos = pos->prev) | |
/* Iterate backwards over the elements list. The list elements can be | |
removed from the list while doing this. */ | |
# define list_for_each_prev_safe(pos, p, head) \ | |
for (pos = (head)->prev, p = pos->prev; \ | |
pos != (head); \ | |
pos = p, p = pos->prev) | |
#endif /* _LIST_H */ | |
#endif /* list.h */ |