FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_linux_list.h

     /* drm_linux_list.h -- linux list functions for the BSDs.
      * Created: Mon Apr 7 14:30:16 1999 by anholt@FreeBSD.org */
     /*-
      * Copyright 2003 Eric Anholt
      * All Rights Reserved.
      *
      * Permission is hereby granted, free of charge, to any person obtaining a
      * copy of this software and associated documentation files (the "Software"),
      * to deal in the Software without restriction, including without limitation
     * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     * and/or sell copies of the Software, and to permit persons to whom the
     * Software is furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice (including the next
     * paragraph) shall be included in all copies or substantial portions of the
     * Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     * OTHER DEALINGS IN THE SOFTWARE.
     *
     * Authors:
     *    Eric Anholt <anholt@FreeBSD.org>
     *
     * $FreeBSD$
     */
    
    struct list_head {
            struct list_head *next, *prev;
    };
    
    /* Cheat, assume the list_head is at the start of the struct */
    #define list_entry(entry, type, member) (type *)(entry)
    
    static __inline__ void
    INIT_LIST_HEAD(struct list_head *head) {
            (head)->next = head;
            (head)->prev = head;
    }
    
    static __inline__ int
    list_empty(struct list_head *head) {
            return (head)->next == head;
    }
    
    static __inline__ void
    list_add_tail(struct list_head *entry, struct list_head *head) {
            (entry)->prev = (head)->prev;
            (entry)->next = head;
            (head)->prev->next = entry;
            (head)->prev = entry;
    }
    
    static __inline__ void
    list_del(struct list_head *entry) {
            (entry)->next->prev = (entry)->prev;
            (entry)->prev->next = (entry)->next;
    }
    
    #define list_for_each(entry, head)                              \
        for (entry = (head)->next; entry != head; entry = (entry)->next)
    
    #define list_for_each_safe(entry, temp, head)                   \
        for (entry = (head)->next, temp = (entry)->next;            \
            temp != head;                                           \
            entry = temp, temp = temp->next)
    

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