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"
40 #include "thr_private.h"
42 /* Static variables: */
43 struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX];
45 __weak_reference(_pthread_key_create, pthread_key_create);
46 __weak_reference(_pthread_key_delete, pthread_key_delete);
47 __weak_reference(_pthread_getspecific, pthread_getspecific);
48 __weak_reference(_pthread_setspecific, pthread_setspecific);
52 _pthread_key_create(pthread_key_t *key, void (*destructor) (void *))
54 struct pthread *curthread;
59 curthread = _get_curthread();
61 /* Lock the key table: */
62 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
63 for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
65 if (_thread_keytable[i].allocated == 0) {
66 _thread_keytable[i].allocated = 1;
67 _thread_keytable[i].destructor = destructor;
68 _thread_keytable[i].seqno++;
70 /* Unlock the key table: */
71 THR_LOCK_RELEASE(curthread, &_keytable_lock);
77 /* Unlock the key table: */
78 THR_LOCK_RELEASE(curthread, &_keytable_lock);
83 _pthread_key_delete(pthread_key_t userkey)
85 struct pthread *curthread = _get_curthread();
86 int key = userkey - 1;
89 if ((unsigned int)key < PTHREAD_KEYS_MAX) {
90 /* Lock the key table: */
91 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
93 if (_thread_keytable[key].allocated)
94 _thread_keytable[key].allocated = 0;
98 /* Unlock the key table: */
99 THR_LOCK_RELEASE(curthread, &_keytable_lock);
106 _thread_cleanupspecific(void)
108 struct pthread *curthread = _get_curthread();
109 void (*destructor)( void *);
110 const void *data = NULL;
114 if (curthread->specific == NULL)
117 /* Lock the key table: */
118 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
119 for (i = 0; (i < PTHREAD_DESTRUCTOR_ITERATIONS) &&
120 (curthread->specific_data_count > 0); i++) {
121 for (key = 0; (key < PTHREAD_KEYS_MAX) &&
122 (curthread->specific_data_count > 0); key++) {
125 if (_thread_keytable[key].allocated &&
126 (curthread->specific[key].data != NULL)) {
127 if (curthread->specific[key].seqno ==
128 _thread_keytable[key].seqno) {
129 data = curthread->specific[key].data;
130 destructor = _thread_keytable[key].destructor;
132 curthread->specific[key].data = NULL;
133 curthread->specific_data_count--;
135 else if (curthread->specific[key].data != NULL) {
137 * This can happen if the key is deleted via
138 * pthread_key_delete without first setting the value
139 * to NULL in all threads. POSIX says that the
140 * destructor is not invoked in this case.
142 curthread->specific[key].data = NULL;
143 curthread->specific_data_count--;
147 * If there is a destructor, call it
148 * with the key table entry unlocked:
150 if (destructor != NULL) {
152 * Don't hold the lock while calling the
155 THR_LOCK_RELEASE(curthread, &_keytable_lock);
156 destructor(__DECONST(void *, data));
157 THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
161 THR_LOCK_RELEASE(curthread, &_keytable_lock);
162 free(curthread->specific);
163 curthread->specific = NULL;
164 if (curthread->specific_data_count > 0)
165 stderr_debug("Thread %p has exited with leftover "
166 "thread-specific data after %d destructor iterations\n",
167 curthread, PTHREAD_DESTRUCTOR_ITERATIONS);
170 static inline struct pthread_specific_elem *
171 pthread_key_allocate_data(void)
173 struct pthread_specific_elem *new_data;
175 new_data = (struct pthread_specific_elem *)
176 calloc(1, sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX);
181 _pthread_setspecific(pthread_key_t userkey, const void *value)
183 struct pthread *pthread;
184 pthread_key_t key = userkey - 1;
187 /* Point to the running thread: */
188 pthread = _get_curthread();
190 if ((pthread->specific) ||
191 (pthread->specific = pthread_key_allocate_data())) {
192 if ((unsigned int)key < PTHREAD_KEYS_MAX) {
193 if (_thread_keytable[key].allocated) {
194 if (pthread->specific[key].data == NULL) {
196 pthread->specific_data_count++;
197 } else if (value == NULL)
198 pthread->specific_data_count--;
199 pthread->specific[key].data = value;
200 pthread->specific[key].seqno =
201 _thread_keytable[key].seqno;
213 _pthread_getspecific(pthread_key_t userkey)
215 struct pthread *pthread;
216 pthread_key_t key = userkey - 1;
219 /* Point to the running thread: */
220 pthread = _get_curthread();
222 /* Check if there is specific data: */
223 if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) {
224 /* Check if this key has been used before: */
225 if (_thread_keytable[key].allocated &&
226 (pthread->specific[key].seqno == _thread_keytable[key].seqno)) {
227 /* Return the value: */
228 data = pthread->specific[key].data;
231 * This key has not been used before, so return NULL
237 /* No specific data has been created, so just return NULL: */
239 return (__DECONST(void *, data));