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#include "thr_private.h" 40 41 42struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX]; 43 44__weak_reference(_pthread_key_create, pthread_key_create); 45__weak_reference(_pthread_key_delete, pthread_key_delete); 46__weak_reference(_pthread_getspecific, pthread_getspecific); 47__weak_reference(_pthread_setspecific, pthread_setspecific); 48 49 50int 51_pthread_key_create(pthread_key_t *key, void (*destructor) (void *)) 52{ 53 struct pthread *curthread; 54 int i; 55 56 if (_thr_initial == NULL) 57 _libpthread_init(NULL); 58 curthread = _get_curthread(); 59 60 /* Lock the key table: */ 61 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 62 for (i = 0; i < PTHREAD_KEYS_MAX; i++) { 63 64 if (_thread_keytable[i].allocated == 0) { 65 _thread_keytable[i].allocated = 1; 66 _thread_keytable[i].destructor = destructor; 67 _thread_keytable[i].seqno++; 68 69 /* Unlock the key table: */ 70 THR_LOCK_RELEASE(curthread, &_keytable_lock); 71 *key = i; 72 return (0); 73 } 74 75 } 76 /* Unlock the key table: */ 77 THR_LOCK_RELEASE(curthread, &_keytable_lock); 78 return (EAGAIN); 79} 80 81int 82_pthread_key_delete(pthread_key_t key) 83{ 84 struct pthread *curthread = _get_curthread(); 85 int ret = 0; 86 87 if ((unsigned int)key < PTHREAD_KEYS_MAX) { 88 /* Lock the key table: */ 89 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 90 91 if (_thread_keytable[key].allocated) 92 _thread_keytable[key].allocated = 0; 93 else 94 ret = EINVAL; 95 96 /* Unlock the key table: */ 97 THR_LOCK_RELEASE(curthread, &_keytable_lock); 98 } else 99 ret = EINVAL; 100 return (ret); 101} 102 103void 104_thread_cleanupspecific(void) 105{ 106 struct pthread *curthread = _get_curthread(); 107 const_key_destructor_t destructor; 108 const void *data = NULL; 109 int key; 110 int i; 111 112 if (curthread->specific == NULL) 113 return; 114 115 /* Lock the key table: */ 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++) { 121 destructor = NULL; 122 123 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 = (const_key_destructor_t) 129 _thread_keytable[key].destructor; 130 } 131 curthread->specific[key].data = NULL; 132 curthread->specific_data_count--; 133 } 134 135 /* 136 * If there is a destructore, call it 137 * with the key table entry unlocked: 138 */ 139 if (destructor != NULL) { 140 /* 141 * Don't hold the lock while calling the 142 * destructor: 143 */ 144 THR_LOCK_RELEASE(curthread, &_keytable_lock); 145 destructor(data); 146 THR_LOCK_ACQUIRE(curthread, &_keytable_lock); 147 } 148 } 149 } 150 THR_LOCK_RELEASE(curthread, &_keytable_lock); 151 free(curthread->specific); 152 curthread->specific = NULL; 153 if (curthread->specific_data_count > 0) 154 stderr_debug("Thread %p has exited with leftover " 155 "thread-specific data after %d destructor iterations\n", 156 curthread, PTHREAD_DESTRUCTOR_ITERATIONS); 157} 158 159static inline struct pthread_specific_elem * 160pthread_key_allocate_data(void) 161{ 162 struct pthread_specific_elem *new_data; 163 164 new_data = (struct pthread_specific_elem *) 165 malloc(sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX); 166 if (new_data != NULL) { 167 memset((void *) new_data, 0, 168 sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX); 169 } 170 return (new_data); 171} 172 173int 174_pthread_setspecific(pthread_key_t key, const void *value) 175{ 176 struct pthread *pthread; 177 int ret = 0; 178 179 /* Point to the running thread: */ 180 pthread = _get_curthread(); 181 182 if ((pthread->specific) || 183 (pthread->specific = pthread_key_allocate_data())) { 184 if ((unsigned int)key < PTHREAD_KEYS_MAX) { 185 if (_thread_keytable[key].allocated) { 186 if (pthread->specific[key].data == NULL) { 187 if (value != NULL) 188 pthread->specific_data_count++; 189 } else if (value == NULL) 190 pthread->specific_data_count--; 191 *(const void **)&pthread->specific[key].data = value; 192 pthread->specific[key].seqno = 193 _thread_keytable[key].seqno; 194 ret = 0; 195 } else 196 ret = EINVAL; 197 } else 198 ret = EINVAL; 199 } else 200 ret = ENOMEM; 201 return (ret); 202} 203 204void * 205_pthread_getspecific(pthread_key_t key) 206{ 207 struct pthread *pthread; 208 void *data; 209 210 /* Point to the running thread: */ 211 pthread = _get_curthread(); 212 213 /* Check if there is specific data: */ 214 if (pthread->specific != NULL && (unsigned int)key < PTHREAD_KEYS_MAX) { 215 /* Check if this key has been used before: */ 216 if (_thread_keytable[key].allocated && 217 (pthread->specific[key].seqno == _thread_keytable[key].seqno)) { 218 /* Return the value: */ 219 data = pthread->specific[key].data; 220 } else { 221 /* 222 * This key has not been used before, so return NULL 223 * instead: 224 */ 225 data = NULL; 226 } 227 } else 228 /* No specific data has been created, so just return NULL: */ 229 data = NULL; 230 return (data); 231} 232