2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include "namespace.h"
38 #include "un-namespace.h"
39 #include "libc_private.h"
41 #include "thr_private.h"
43 /* Static variables: */
44 struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX];
46 __weak_reference(_pthread_key_create, pthread_key_create);
47 __weak_reference(_pthread_key_delete, pthread_key_delete);
48 __weak_reference(_pthread_getspecific, pthread_getspecific);
49 __weak_reference(_pthread_setspecific, pthread_setspecific);
53 _pthread_key_create(pthread_key_t *key, void (*destructor) (void *))
55 struct pthread *curthread;
60 curthread = _get_curthread();
62 /* Lock the key table: */
63 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
64 for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
66 if (_thread_keytable[i].allocated == 0) {
67 _thread_keytable[i].allocated = 1;
68 _thread_keytable[i].destructor = destructor;
69 _thread_keytable[i].seqno++;
71 /* Unlock the key table: */
72 THR_LOCK_RELEASE(curthread, &_keytable_lock);
78 /* Unlock the key table: */
79 THR_LOCK_RELEASE(curthread, &_keytable_lock);
84 _pthread_key_delete(pthread_key_t userkey)
86 struct pthread *curthread = _get_curthread();
87 int key = userkey - 1;
90 if ((unsigned int)key < PTHREAD_KEYS_MAX) {
91 /* Lock the key table: */
92 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
94 if (_thread_keytable[key].allocated)
95 _thread_keytable[key].allocated = 0;
99 /* Unlock the key table: */
100 THR_LOCK_RELEASE(curthread, &_keytable_lock);
107 _thread_cleanupspecific(void)
109 struct pthread *curthread = _get_curthread();
110 void (*destructor)( void *);
111 const void *data = NULL;
115 if (curthread->specific == NULL)
118 /* Lock the key table: */
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].destructor;
133 curthread->specific[key].data = NULL;
134 curthread->specific_data_count--;
136 else if (curthread->specific[key].data != NULL) {
138 * This can happen if the key is deleted via
139 * pthread_key_delete without first setting the value
140 * to NULL in all threads. POSIX says that the
141 * destructor is not invoked in this case.
143 curthread->specific[key].data = NULL;
144 curthread->specific_data_count--;
148 * If there is a destructor, call it
149 * with the key table entry unlocked:
151 if (destructor != NULL) {
153 * Don't hold the lock while calling the
156 THR_LOCK_RELEASE(curthread, &_keytable_lock);
157 destructor(__DECONST(void *, data));
158 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
162 THR_LOCK_RELEASE(curthread, &_keytable_lock);
163 free(curthread->specific);
164 curthread->specific = NULL;
165 if (curthread->specific_data_count > 0)
166 stderr_debug("Thread %p has exited with leftover "
167 "thread-specific data after %d destructor iterations\n",
168 curthread, PTHREAD_DESTRUCTOR_ITERATIONS);
171 static inline struct pthread_specific_elem *
172 pthread_key_allocate_data(void)
174 struct pthread_specific_elem *new_data;
176 new_data = (struct pthread_specific_elem *)
177 calloc(1, sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX);
182 _pthread_setspecific(pthread_key_t userkey, const void *value)
184 struct pthread *pthread;
185 pthread_key_t key = userkey - 1;
188 /* Point to the running thread: */
189 pthread = _get_curthread();
191 if ((pthread->specific) ||
192 (pthread->specific = pthread_key_allocate_data())) {
193 if ((unsigned int)key < PTHREAD_KEYS_MAX) {
194 if (_thread_keytable[key].allocated) {
195 if (pthread->specific[key].data == NULL) {
197 pthread->specific_data_count++;
198 } else if (value == NULL)
199 pthread->specific_data_count--;
200 pthread->specific[key].data = value;
201 pthread->specific[key].seqno =
202 _thread_keytable[key].seqno;
214 _pthread_getspecific(pthread_key_t userkey)
216 struct pthread *pthread;
217 pthread_key_t key = userkey - 1;
220 /* Point to the running thread: */
221 pthread = _get_curthread();
223 /* Check if there is specific data: */
224 if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {
225 /* Check if this key has been used before: */
226 if (_thread_keytable[key].allocated &&
227 (pthread->specific[key].seqno == _thread_keytable[key].seqno)) {
228 /* Return the value: */
229 data = pthread->specific[key].data;
232 * This key has not been used before, so return NULL
238 /* No specific data has been created, so just return NULL: */
240 return (__DECONST(void *, data));
244 _thr_tsd_unload(struct dl_phdr_info *phdr_info)
246 struct pthread *curthread = _get_curthread();
247 void (*destructor)(void *);
250 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
251 for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
252 if (_thread_keytable[key].allocated) {
253 destructor = _thread_keytable[key].destructor;
254 if (destructor != NULL) {
255 if (__elf_phdr_match_addr(phdr_info, destructor))
256 _thread_keytable[key].destructor = NULL;
260 THR_LOCK_RELEASE(curthread, &_keytable_lock);