1/*	$NetBSD: subr_lwp_specificdata.c,v 1.1 2010/04/12 22:15:31 pooka Exp $	*/
2
3/*-
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
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 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#define _LWP_API_PRIVATE
30
31#include <sys/cdefs.h>
32__KERNEL_RCSID(0, "$NetBSD: subr_lwp_specificdata.c,v 1.1 2010/04/12 22:15:31 pooka Exp $");
33
34#include <sys/param.h>
35#include <sys/lwp.h>
36#include <sys/specificdata.h>
37
38static specificdata_domain_t lwp_specificdata_domain;
39
40void
41lwpinit_specificdata(void)
42{
43
44	lwp_specificdata_domain = specificdata_domain_create();
45	KASSERT(lwp_specificdata_domain != NULL);
46}
47
48/*
49 * lwp_specific_key_create --
50 *	Create a key for subsystem lwp-specific data.
51 */
52int
53lwp_specific_key_create(specificdata_key_t *keyp, specificdata_dtor_t dtor)
54{
55
56	return (specificdata_key_create(lwp_specificdata_domain, keyp, dtor));
57}
58
59/*
60 * lwp_specific_key_delete --
61 *	Delete a key for subsystem lwp-specific data.
62 */
63void
64lwp_specific_key_delete(specificdata_key_t key)
65{
66
67	specificdata_key_delete(lwp_specificdata_domain, key);
68}
69
70/*
71 * lwp_initspecific --
72 *	Initialize an LWP's specificdata container.
73 */
74void
75lwp_initspecific(struct lwp *l)
76{
77	int error;
78
79	error = specificdata_init(lwp_specificdata_domain, &l->l_specdataref);
80	KASSERT(error == 0);
81}
82
83/*
84 * lwp_finispecific --
85 *	Finalize an LWP's specificdata container.
86 */
87void
88lwp_finispecific(struct lwp *l)
89{
90
91	specificdata_fini(lwp_specificdata_domain, &l->l_specdataref);
92}
93
94/*
95 * lwp_getspecific --
96 *	Return lwp-specific data corresponding to the specified key.
97 *
98 *	Note: LWP specific data is NOT INTERLOCKED.  An LWP should access
99 *	only its OWN SPECIFIC DATA.  If it is necessary to access another
100 *	LWP's specifc data, care must be taken to ensure that doing so
101 *	would not cause internal data structure inconsistency (i.e. caller
102 *	can guarantee that the target LWP is not inside an lwp_getspecific()
103 *	or lwp_setspecific() call).
104 */
105void *
106lwp_getspecific(specificdata_key_t key)
107{
108
109	return (specificdata_getspecific_unlocked(lwp_specificdata_domain,
110						  &curlwp->l_specdataref, key));
111}
112
113void *
114_lwp_getspecific_by_lwp(struct lwp *l, specificdata_key_t key)
115{
116
117	return (specificdata_getspecific_unlocked(lwp_specificdata_domain,
118						  &l->l_specdataref, key));
119}
120
121/*
122 * lwp_setspecific --
123 *	Set lwp-specific data corresponding to the specified key.
124 */
125void
126lwp_setspecific(specificdata_key_t key, void *data)
127{
128
129	specificdata_setspecific(lwp_specificdata_domain,
130				 &curlwp->l_specdataref, key, data);
131}
132