scoutos / prex-0.9.0 / include / sys / queue.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _SYS_QUEUE_H
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31 | #define _SYS_QUEUE_H
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32 | |||
33 | #include <sys/cdefs.h> |
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34 | |||
35 | struct queue {
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36 | struct queue *next;
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37 | struct queue *prev;
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38 | }; |
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39 | typedef struct queue *queue_t; |
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40 | |||
41 | #define queue_init(head) ((head)->next = (head)->prev = (head))
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42 | #define queue_empty(head) ((head)->next == (head))
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43 | #define queue_next(q) ((q)->next)
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44 | #define queue_prev(q) ((q)->prev)
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45 | #define queue_first(head) ((head)->next)
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46 | #define queue_last(head) ((head)->prev)
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47 | #define queue_end(head,q) ((q) == (head))
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48 | |||
49 | /* Get the struct for this entry */
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50 | #define queue_entry(q, type, member) \
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51 | ((type *)((char *)(q) - (unsigned long)(&((type *)0)->member))) |
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52 | |||
53 | __BEGIN_DECLS |
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54 | void enqueue(queue_t, queue_t);
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55 | queue_t dequeue(queue_t); |
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56 | void queue_insert(queue_t, queue_t);
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57 | void queue_remove(queue_t);
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58 | __END_DECLS |
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59 | |||
60 | #endif /* !_SYS_QUEUE_H */ |