1 /* 2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 16 * 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 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include "namespace.h" 33 #include <signal.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <errno.h> 37 #include <pthread.h> 38 #include "un-namespace.h" 39 40 #include "thr_private.h" 41 42 /* Static variables: */ 43 struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX]; 44 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); 49 50 51 int 52 _pthread_key_create(pthread_key_t *key, void (*destructor) (void *)) 53 { 54 struct pthread *curthread = _get_curthread(); 55 int i; 56 57 /* Lock the key table: */ 58 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 59 for (i = 0; i < PTHREAD_KEYS_MAX; i++) { 60 61 if (_thread_keytable[i].allocated == 0) { 62 _thread_keytable[i].allocated = 1; 63 _thread_keytable[i].destructor = destructor; 64 _thread_keytable[i].seqno++; 65 66 /* Unlock the key table: */ 67 THR_LOCK_RELEASE(curthread, &_keytable_lock); 68 *key = i; 69 return (0); 70 } 71 72 } 73 /* Unlock the key table: */ 74 THR_LOCK_RELEASE(curthread, &_keytable_lock); 75 return (EAGAIN); 76 } 77 78 int 79 _pthread_key_delete(pthread_key_t key) 80 { 81 struct pthread *curthread = _get_curthread(); 82 int ret = 0; 83 84 if ((unsigned int)key < PTHREAD_KEYS_MAX) { 85 /* Lock the key table: */ 86 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 87 88 if (_thread_keytable[key].allocated) 89 _thread_keytable[key].allocated = 0; 90 else 91 ret = EINVAL; 92 93 /* Unlock the key table: */ 94 THR_LOCK_RELEASE(curthread, &_keytable_lock); 95 } else 96 ret = EINVAL; 97 return (ret); 98 } 99 100 void 101 _thread_cleanupspecific(void) 102 { 103 struct pthread *curthread = _get_curthread(); 104 void (*destructor)( void *); 105 const void *data = NULL; 106 int key; 107 int i; 108 109 if (curthread->specific == NULL) 110 return; 111 112 /* Lock the key table: */ 113 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 114 for (i = 0; (i < PTHREAD_DESTRUCTOR_ITERATIONS) && 115 (curthread->specific_data_count > 0); i++) { 116 for (key = 0; (key < PTHREAD_KEYS_MAX) && 117 (curthread->specific_data_count > 0); key++) { 118 destructor = NULL; 119 120 if (_thread_keytable[key].allocated && 121 (curthread->specific[key].data != NULL)) { 122 if (curthread->specific[key].seqno == 123 _thread_keytable[key].seqno) { 124 data = curthread->specific[key].data; 125 destructor = _thread_keytable[key].destructor; 126 } 127 curthread->specific[key].data = NULL; 128 curthread->specific_data_count--; 129 } 130 131 /* 132 * If there is a destructore, call it 133 * with the key table entry unlocked: 134 */ 135 if (destructor != NULL) { 136 /* 137 * Don't hold the lock while calling the 138 * destructor: 139 */ 140 THR_LOCK_RELEASE(curthread, &_keytable_lock); 141 destructor(__DECONST(void *, data)); 142 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 143 } 144 } 145 } 146 THR_LOCK_RELEASE(curthread, &_keytable_lock); 147 free(curthread->specific); 148 curthread->specific = NULL; 149 if (curthread->specific_data_count > 0) 150 stderr_debug("Thread %p has exited with leftover " 151 "thread-specific data after %d destructor iterations\n", 152 curthread, PTHREAD_DESTRUCTOR_ITERATIONS); 153 } 154 155 static inline struct pthread_specific_elem * 156 pthread_key_allocate_data(void) 157 { 158 struct pthread_specific_elem *new_data; 159 160 new_data = (struct pthread_specific_elem *) 161 calloc(1, sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX); 162 return (new_data); 163 } 164 165 int 166 _pthread_setspecific(pthread_key_t key, const void *value) 167 { 168 struct pthread *pthread; 169 int ret = 0; 170 171 /* Point to the running thread: */ 172 pthread = _get_curthread(); 173 174 if ((pthread->specific) || 175 (pthread->specific = pthread_key_allocate_data())) { 176 if ((unsigned int)key < PTHREAD_KEYS_MAX) { 177 if (_thread_keytable[key].allocated) { 178 if (pthread->specific[key].data == NULL) { 179 if (value != NULL) 180 pthread->specific_data_count++; 181 } else if (value == NULL) 182 pthread->specific_data_count--; 183 pthread->specific[key].data = value; 184 pthread->specific[key].seqno = 185 _thread_keytable[key].seqno; 186 ret = 0; 187 } else 188 ret = EINVAL; 189 } else 190 ret = EINVAL; 191 } else 192 ret = ENOMEM; 193 return (ret); 194 } 195 196 void * 197 _pthread_getspecific(pthread_key_t key) 198 { 199 struct pthread *pthread; 200 const void *data; 201 202 /* Point to the running thread: */ 203 pthread = _get_curthread(); 204 205 /* Check if there is specific data: */ 206 if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) { 207 /* Check if this key has been used before: */ 208 if (_thread_keytable[key].allocated && 209 (pthread->specific[key].seqno == _thread_keytable[key].seqno)) { 210 /* Return the value: */ 211 data = pthread->specific[key].data; 212 } else { 213 /* 214 * This key has not been used before, so return NULL 215 * instead: 216 */ 217 data = NULL; 218 } 219 } else 220 /* No specific data has been created, so just return NULL: */ 221 data = NULL; 222 return (__DECONST(void *, data)); 223 } 224