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(_pthread_key_create, pthread_key_create);
51 __weak_reference(_pthread_key_delete, pthread_key_delete);
52 __weak_reference(_pthread_getspecific, pthread_getspecific);
53 __weak_reference(_pthread_setspecific, pthread_setspecific);
57 _pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
59 struct pthread *curthread;
64 curthread = _get_curthread();
66 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
67 for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
69 if (_thread_keytable[i].allocated == 0) {
70 _thread_keytable[i].allocated = 1;
71 _thread_keytable[i].destructor = destructor;
72 _thread_keytable[i].seqno++;
74 THR_LOCK_RELEASE(curthread, &_keytable_lock);
80 THR_LOCK_RELEASE(curthread, &_keytable_lock);
85 _pthread_key_delete(pthread_key_t userkey)
87 struct pthread *curthread;
91 if ((unsigned int)key >= PTHREAD_KEYS_MAX)
93 curthread = _get_curthread();
94 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
95 if (_thread_keytable[key].allocated) {
96 _thread_keytable[key].allocated = 0;
101 THR_LOCK_RELEASE(curthread, &_keytable_lock);
106 _thread_cleanupspecific(void)
108 struct pthread *curthread;
109 void (*destructor)(void *);
113 curthread = _get_curthread();
114 if (curthread->specific == NULL)
116 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
117 for (i = 0; i < PTHREAD_DESTRUCTOR_ITERATIONS &&
118 curthread->specific_data_count > 0; i++) {
119 for (key = 0; key < PTHREAD_KEYS_MAX &&
120 curthread->specific_data_count > 0; key++) {
123 if (_thread_keytable[key].allocated &&
124 (curthread->specific[key].data != NULL)) {
125 if (curthread->specific[key].seqno ==
126 _thread_keytable[key].seqno) {
127 data = curthread->specific[key].data;
128 destructor = _thread_keytable[key].
131 curthread->specific[key].data = NULL;
132 curthread->specific_data_count--;
133 } else if (curthread->specific[key].data != NULL) {
135 * This can happen if the key is
136 * deleted via pthread_key_delete
137 * without first setting the value to
138 * NULL in all threads. POSIX says
139 * that the destructor is not invoked
142 curthread->specific[key].data = NULL;
143 curthread->specific_data_count--;
147 * If there is a destructor, call it with the
148 * key table entry unlocked.
150 if (destructor != NULL) {
151 THR_LOCK_RELEASE(curthread, &_keytable_lock);
152 destructor(__DECONST(void *, data));
153 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
157 THR_LOCK_RELEASE(curthread, &_keytable_lock);
158 munmap(curthread->specific, PTHREAD_KEYS_MAX * sizeof(struct
159 pthread_specific_elem));
160 curthread->specific = NULL;
161 if (curthread->specific_data_count > 0) {
162 stderr_debug("Thread %p has exited with leftover "
163 "thread-specific data after %d destructor iterations\n",
164 curthread, PTHREAD_DESTRUCTOR_ITERATIONS);
169 _pthread_setspecific(pthread_key_t userkey, const void *value)
171 struct pthread *pthread;
176 if ((unsigned int)key >= PTHREAD_KEYS_MAX ||
177 !_thread_keytable[key].allocated)
180 pthread = _get_curthread();
181 if (pthread->specific == NULL) {
182 tmp = mmap(NULL, PTHREAD_KEYS_MAX *
183 sizeof(struct pthread_specific_elem),
184 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
185 if (tmp == MAP_FAILED)
187 pthread->specific = tmp;
189 if (pthread->specific[key].data == NULL) {
191 pthread->specific_data_count++;
192 } else if (value == NULL)
193 pthread->specific_data_count--;
194 pthread->specific[key].data = value;
195 pthread->specific[key].seqno = _thread_keytable[key].seqno;
200 _pthread_getspecific(pthread_key_t userkey)
202 struct pthread *pthread;
206 /* Check if there is specific data. */
208 if ((unsigned int)key >= PTHREAD_KEYS_MAX)
211 pthread = _get_curthread();
212 /* Check if this key has been used before. */
213 if (_thread_keytable[key].allocated && pthread->specific != NULL &&
214 pthread->specific[key].seqno == _thread_keytable[key].seqno) {
215 /* Return the value: */
216 data = pthread->specific[key].data;
219 * This key has not been used before, so return NULL
224 return (__DECONST(void *, data));
228 _thr_tsd_unload(struct dl_phdr_info *phdr_info)
230 struct pthread *curthread;
231 void (*destructor)(void *);
234 curthread = _get_curthread();
235 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
236 for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
237 if (!_thread_keytable[key].allocated)
239 destructor = _thread_keytable[key].destructor;
240 if (destructor == NULL)
242 if (__elf_phdr_match_addr(phdr_info, destructor))
243 _thread_keytable[key].destructor = NULL;
245 THR_LOCK_RELEASE(curthread, &_keytable_lock);