| 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 | |