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Annotation of prex/dev/include/queue.h, Revision 1.1.1.1

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 */