1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/* $OpenBSD: rthread_tls.c,v 1.16 2013/11/02 22:37:17 tedu Exp $ */
/*
* Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* thread specific storage
*/
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#include "rthread.h"
static struct rthread_key rkeys[PTHREAD_KEYS_MAX];
static struct _spinlock rkeyslock = _SPINLOCK_UNLOCKED;
int
pthread_key_create(pthread_key_t *key, void (*destructor)(void*))
{
static int hint;
int i;
_spinlock(&rkeyslock);
if (rkeys[hint].used) {
for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
if (!rkeys[i].used)
break;
}
if (i == PTHREAD_KEYS_MAX) {
_spinunlock(&rkeyslock);
return (EAGAIN);
}
hint = i;
}
rkeys[hint].used = 1;
rkeys[hint].destructor = destructor;
*key = hint++;
if (hint >= PTHREAD_KEYS_MAX)
hint = 0;
_spinunlock(&rkeyslock);
return (0);
}
int
pthread_key_delete(pthread_key_t key)
{
pthread_t thread;
struct rthread_storage *rs;
int rv = 0;
if (key < 0 || key >= PTHREAD_KEYS_MAX)
return (EINVAL);
_spinlock(&rkeyslock);
if (!rkeys[key].used) {
rv = EINVAL;
goto out;
}
rkeys[key].used = 0;
rkeys[key].destructor = NULL;
_spinlock(&_thread_lock);
LIST_FOREACH(thread, &_thread_list, threads) {
for (rs = thread->local_storage; rs; rs = rs->next) {
if (rs->keyid == key)
rs->data = NULL;
}
}
_spinunlock(&_thread_lock);
out:
_spinunlock(&rkeyslock);
return (rv);
}
static struct rthread_storage *
_rthread_findstorage(pthread_key_t key)
{
struct rthread_storage *rs;
pthread_t self;
if (!rkeys[key].used) {
rs = NULL;
goto out;
}
self = pthread_self();
for (rs = self->local_storage; rs; rs = rs->next) {
if (rs->keyid == key)
break;
}
if (!rs) {
rs = calloc(1, sizeof(*rs));
if (!rs)
goto out;
rs->keyid = key;
rs->data = NULL;
rs->next = self->local_storage;
self->local_storage = rs;
}
out:
return (rs);
}
void *
pthread_getspecific(pthread_key_t key)
{
struct rthread_storage *rs;
if (key < 0 || key >= PTHREAD_KEYS_MAX)
return (NULL);
rs = _rthread_findstorage(key);
if (!rs)
return (NULL);
return (rs->data);
}
int
pthread_setspecific(pthread_key_t key, const void *data)
{
struct rthread_storage *rs;
if (key < 0 || key >= PTHREAD_KEYS_MAX)
return (EINVAL);
rs = _rthread_findstorage(key);
if (!rs)
return (ENOMEM);
rs->data = (void *)data;
return (0);
}
void
_rthread_tls_destructors(pthread_t thread)
{
struct rthread_storage *rs;
int i;
_spinlock(&rkeyslock);
for (i = 0; i < PTHREAD_DESTRUCTOR_ITERATIONS; i++) {
for (rs = thread->local_storage; rs; rs = rs->next) {
if (!rs->data)
continue;
if (rkeys[rs->keyid].destructor) {
void (*destructor)(void *) =
rkeys[rs->keyid].destructor;
void *data = rs->data;
rs->data = NULL;
_spinunlock(&rkeyslock);
destructor(data);
_spinlock(&rkeyslock);
}
}
}
for (rs = thread->local_storage; rs; rs = thread->local_storage) {
thread->local_storage = rs->next;
free(rs);
}
_spinunlock(&rkeyslock);
}
|
