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 |
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 |
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 |
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 |
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 |
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 * |
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 * |
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 |
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 | |