2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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 * 3. Neither the name of the author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "namespace.h"
42 #include "un-namespace.h"
43 #include "libc_private.h"
45 #include "thr_private.h"
47 /* Used in symbol lookup of libthread_db */
48 struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX];
50 __weak_reference(_thr_key_create, pthread_key_create);
51 __weak_reference(_thr_key_create, _pthread_key_create);
52 __weak_reference(_thr_key_delete, pthread_key_delete);
53 __weak_reference(_thr_key_delete, _pthread_key_delete);
54 __weak_reference(_thr_getspecific, pthread_getspecific);
55 __weak_reference(_thr_getspecific, _pthread_getspecific);
56 __weak_reference(_thr_setspecific, pthread_setspecific);
57 __weak_reference(_thr_setspecific, _pthread_setspecific);
60 _thr_key_create(pthread_key_t *key, void (*destructor)(void *))
62 struct pthread *curthread;
67 curthread = _get_curthread();
69 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
70 for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
72 if (_thread_keytable[i].allocated == 0) {
73 _thread_keytable[i].allocated = 1;
74 _thread_keytable[i].destructor = destructor;
75 _thread_keytable[i].seqno++;
77 THR_LOCK_RELEASE(curthread, &_keytable_lock);
83 THR_LOCK_RELEASE(curthread, &_keytable_lock);
88 _thr_key_delete(pthread_key_t userkey)
90 struct pthread *curthread;
94 if ((unsigned int)key >= PTHREAD_KEYS_MAX)
96 curthread = _get_curthread();
97 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
98 if (_thread_keytable[key].allocated) {
99 _thread_keytable[key].allocated = 0;
104 THR_LOCK_RELEASE(curthread, &_keytable_lock);
109 _thread_cleanupspecific(void)
111 struct pthread *curthread;
112 void (*destructor)(void *);
116 curthread = _get_curthread();
117 if (curthread->specific == NULL)
119 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
120 for (i = 0; i < PTHREAD_DESTRUCTOR_ITERATIONS &&
121 curthread->specific_data_count > 0; i++) {
122 for (key = 0; key < PTHREAD_KEYS_MAX &&
123 curthread->specific_data_count > 0; key++) {
126 if (_thread_keytable[key].allocated &&
127 (curthread->specific[key].data != NULL)) {
128 if (curthread->specific[key].seqno ==
129 _thread_keytable[key].seqno) {
130 data = curthread->specific[key].data;
131 destructor = _thread_keytable[key].
134 curthread->specific[key].data = NULL;
135 curthread->specific_data_count--;
136 } else if (curthread->specific[key].data != NULL) {
138 * This can happen if the key is
139 * deleted via pthread_key_delete
140 * without first setting the value to
141 * NULL in all threads. POSIX says
142 * that the destructor is not invoked
145 curthread->specific[key].data = NULL;
146 curthread->specific_data_count--;
150 * If there is a destructor, call it with the
151 * key table entry unlocked.
153 if (destructor != NULL) {
154 THR_LOCK_RELEASE(curthread, &_keytable_lock);
155 destructor(__DECONST(void *, data));
156 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
160 THR_LOCK_RELEASE(curthread, &_keytable_lock);
161 __thr_free(curthread->specific);
162 curthread->specific = NULL;
163 if (curthread->specific_data_count > 0) {
164 stderr_debug("Thread %p has exited with leftover "
165 "thread-specific data after %d destructor iterations\n",
166 curthread, PTHREAD_DESTRUCTOR_ITERATIONS);
171 _thr_setspecific(pthread_key_t userkey, const void *value)
173 struct pthread *pthread;
178 if ((unsigned int)key >= PTHREAD_KEYS_MAX ||
179 !_thread_keytable[key].allocated)
182 pthread = _get_curthread();
183 if (pthread->specific == NULL) {
184 tmp = __thr_calloc(PTHREAD_KEYS_MAX,
185 sizeof(struct pthread_specific_elem));
188 pthread->specific = tmp;
190 if (pthread->specific[key].data == NULL) {
192 pthread->specific_data_count++;
193 } else if (value == NULL)
194 pthread->specific_data_count--;
195 pthread->specific[key].data = value;
196 pthread->specific[key].seqno = _thread_keytable[key].seqno;
201 _thr_getspecific(pthread_key_t userkey)
203 struct pthread *pthread;
207 /* Check if there is specific data. */
209 if ((unsigned int)key >= PTHREAD_KEYS_MAX)
212 pthread = _get_curthread();
213 /* Check if this key has been used before. */
214 if (_thread_keytable[key].allocated && pthread->specific != NULL &&
215 pthread->specific[key].seqno == _thread_keytable[key].seqno) {
216 /* Return the value: */
217 data = pthread->specific[key].data;
220 * This key has not been used before, so return NULL
225 return (__DECONST(void *, data));
229 _thr_tsd_unload(struct dl_phdr_info *phdr_info)
231 struct pthread *curthread;
232 void (*destructor)(void *);
235 curthread = _get_curthread();
236 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
237 for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
238 if (!_thread_keytable[key].allocated)
240 destructor = _thread_keytable[key].destructor;
241 if (destructor == NULL)
243 if (__elf_phdr_match_addr(phdr_info, destructor))
244 _thread_keytable[key].destructor = NULL;
246 THR_LOCK_RELEASE(curthread, &_keytable_lock);