1 /* $NetBSD: subr_lwp_specificdata.c,v 1.3 2013/10/25 16:17:35 martin 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 1.3 2013/10/25 16:17:35 martin Exp $");
33
34 #include <sys/param.h>
35 #include <sys/lwp.h>
36 #include <sys/specificdata.h>
37
38 static specificdata_domain_t lwp_specificdata_domain;
39
40 void
lwpinit_specificdata(void)41 lwpinit_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 */
52 int
lwp_specific_key_create(specificdata_key_t * keyp,specificdata_dtor_t dtor)53 lwp_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 */
63 void
lwp_specific_key_delete(specificdata_key_t key)64 lwp_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 */
74 void
lwp_initspecific(struct lwp * l)75 lwp_initspecific(struct lwp *l)
76 {
77 int error __diagused;
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 */
87 void
lwp_finispecific(struct lwp * l)88 lwp_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 */
105 void *
lwp_getspecific(specificdata_key_t key)106 lwp_getspecific(specificdata_key_t key)
107 {
108
109 return (specificdata_getspecific_unlocked(lwp_specificdata_domain,
110 &curlwp->l_specdataref, key));
111 }
112
113 void *
_lwp_getspecific_by_lwp(struct lwp * l,specificdata_key_t key)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 */
125 void
lwp_setspecific(specificdata_key_t key,void * data)126 lwp_setspecific(specificdata_key_t key, void *data)
127 {
128
129 specificdata_setspecific(lwp_specificdata_domain,
130 &curlwp->l_specdataref, key, data);
131 }
132