FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/_que.c

     /*      $NetBSD: _que.c,v 1.1 2001/08/12 08:35:34 jdolecek Exp $        */
     
     /*-
      * Copyright (c) 2001 The NetBSD Foundation, 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, 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the NetBSD
     *      Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``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 FOUNDATION OR CONTRIBUTORS
     * 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.
     */
    
    /*
     * Use <sys/queue.h> macros for new code, queue functions provided here
     * are obsolete. Once the remaining code using this would be converted
     * to use <sys/queue.h>, this would be removed. 
     */
    
    #include <sys/types.h>
    #include <sys/systm.h>
    
    struct queue {
            struct queue *q_next, *q_prev;
    };
    
    /*
     * insert an element into a queue
     */
    
    void
    _insque(v1, v2)
            void *v1;
            void *v2;
    {
            struct queue *elem = v1, *head = v2;
            struct queue *next;
    
            next = head->q_next;
            elem->q_next = next;
            head->q_next = elem;
            elem->q_prev = head;
            next->q_prev = elem;
    }
    
    /*
     * remove an element from a queue
     */
    
    void
    _remque(v)
            void *v;
    {
            struct queue *elem = v;
            struct queue *next, *prev;
    
            next = elem->q_next;
            prev = elem->q_prev;
            next->q_prev = prev;
            prev->q_next = next;
            elem->q_prev = 0;
    }

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