80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
#ifndef _LINUX_XLIST_H
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#define _LINUX_XLIST_H
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#include <linux/stddef.h>
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#include <linux/poison.h>
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#include <linux/prefetch.h>
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#include <asm/system.h>
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struct xlist_head {
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struct xlist_head *next;
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};
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static inline void INIT_XLIST_HEAD(struct xlist_head *list)
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{
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list->next = NULL;
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}
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static inline int xlist_empty(struct xlist_head *head)
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{
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return head->next == NULL;
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}
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static inline void xlist_add(struct xlist_head *new, struct xlist_head *tail,
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struct xlist_head *head)
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{
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struct xlist_head *cur;
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struct xlist_head *check;
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while (1) {
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cur = head->next;
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tail->next = cur;
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check = cmpxchg(&head->next, cur, new);
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if (check == cur)
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break;
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}
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}
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static inline struct xlist_head *xlist_del_head(struct xlist_head *head)
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{
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struct xlist_head *cur;
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struct xlist_head *check;
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struct xlist_head *next;
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while (1) {
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cur = head->next;
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if (!cur)
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goto out;
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next = cur->next;
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check = cmpxchg(&head->next, cur, next);
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if (check == cur)
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goto out;
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}
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out:
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return cur;
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}
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static inline struct xlist_head *xlist_del_head_fast(struct xlist_head *head)
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{
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struct xlist_head *cur;
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cur = head->next;
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if (!cur)
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return NULL;
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head->next = cur->next;
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return cur;
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}
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static inline void xlist_splice(struct xlist_head *list,
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struct xlist_head *head)
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{
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struct xlist_head *cur;
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WARN_ON(head->next);
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cur = xchg(&list->next, NULL);
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head->next = cur;
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}
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#endif
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