kernel - Fix sio lockup
[dragonfly.git] / sys / libprop / prop_stack.h
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1/* $NetBSD: prop_stack.h,v 1.2 2007/08/30 12:23:54 joerg Exp $ */
2
3/*-
4 * Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef _PROP_STACK_H
33#define _PROP_STACK_H
34
35#include <sys/queue.h>
36
9f95f3e0 37#include <libprop/prop_object.h>
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38
39struct _prop_stack_intern_elem {
40 prop_object_t object;
41 void *object_data[3];
42};
43
44struct _prop_stack_extern_elem {
45 SLIST_ENTRY(_prop_stack_extern_elem) stack_link;
46 prop_object_t object;
47 void *object_data[3];
48};
49
50#define PROP_STACK_INTERN_ELEMS 16
51
52struct _prop_stack {
53 struct _prop_stack_intern_elem intern_elems[PROP_STACK_INTERN_ELEMS];
54 size_t used_intern_elems;
55 SLIST_HEAD(, _prop_stack_extern_elem) extern_elems;
56};
57
58typedef struct _prop_stack *prop_stack_t;
59
60void _prop_stack_init(prop_stack_t);
61bool _prop_stack_push(prop_stack_t, prop_object_t, void *, void *, void *);
62bool _prop_stack_pop(prop_stack_t, prop_object_t *, void **, void **, void **);
63
64#endif