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Annotation of prex/dev/include/queue.h, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2005, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #ifndef _QUEUE_H
        !            31: #define _QUEUE_H
        !            32:
        !            33: struct queue {
        !            34:        struct queue   *next;
        !            35:        struct queue   *prev;
        !            36: };
        !            37: typedef struct queue *queue_t;
        !            38:
        !            39: #define queue_init(head)       ((head)->next = (head)->prev = (head))
        !            40: #define queue_empty(head)      ((head)->next == (head))
        !            41: #define queue_next(q)          ((q)->next)
        !            42: #define queue_prev(q)          ((q)->prev)
        !            43: #define queue_first(head)      ((head)->next)
        !            44: #define queue_last(head)       ((head)->prev)
        !            45: #define queue_end(head,q)      ((q) == (head))
        !            46:
        !            47: /* Get the struct for this entry */
        !            48: #define queue_entry(q, type, member) \
        !            49:     ((type *)((char *)(q) - (unsigned long)(&((type *)0)->member)))
        !            50:
        !            51: extern void enqueue(queue_t head, queue_t item);
        !            52: extern queue_t dequeue(queue_t head);
        !            53: extern void queue_insert(queue_t prev, queue_t item);
        !            54: extern void queue_remove(queue_t item);
        !            55:
        !            56: #endif /* !_QUEUE_H */