226 lines
6.1 KiB
C
226 lines
6.1 KiB
C
/*
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* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include "pthread_private.h"
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struct pthread_key {
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spinlock_t lock;
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volatile int allocated;
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volatile int count;
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int seqno;
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void (*destructor) ();
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};
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/* Static variables: */
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static struct pthread_key key_table[PTHREAD_KEYS_MAX];
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__weak_reference(_pthread_key_create, pthread_key_create);
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__weak_reference(_pthread_key_delete, pthread_key_delete);
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__weak_reference(_pthread_getspecific, pthread_getspecific);
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__weak_reference(_pthread_setspecific, pthread_setspecific);
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int
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_pthread_key_create(pthread_key_t * key, void (*destructor) (void *))
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{
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for ((*key) = 0; (*key) < PTHREAD_KEYS_MAX; (*key)++) {
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/* Lock the key table entry: */
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_SPINLOCK(&key_table[*key].lock);
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if (key_table[(*key)].allocated == 0) {
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key_table[(*key)].allocated = 1;
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key_table[(*key)].destructor = destructor;
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key_table[(*key)].seqno++;
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/* Unlock the key table entry: */
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_SPINUNLOCK(&key_table[*key].lock);
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return (0);
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}
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/* Unlock the key table entry: */
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_SPINUNLOCK(&key_table[*key].lock);
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}
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return (EAGAIN);
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}
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int
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_pthread_key_delete(pthread_key_t key)
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{
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int ret = 0;
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if (key < PTHREAD_KEYS_MAX) {
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/* Lock the key table entry: */
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_SPINLOCK(&key_table[key].lock);
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if (key_table[key].allocated)
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key_table[key].allocated = 0;
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else
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ret = EINVAL;
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/* Unlock the key table entry: */
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_SPINUNLOCK(&key_table[key].lock);
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} else
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ret = EINVAL;
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return (ret);
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}
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void
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_thread_cleanupspecific(void)
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{
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struct pthread *curthread = _get_curthread();
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void *data = NULL;
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int key;
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int itr;
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void (*destructor)( void *);
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for (itr = 0; itr < PTHREAD_DESTRUCTOR_ITERATIONS; itr++) {
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for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
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if (curthread->specific_data_count > 0) {
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/* Lock the key table entry: */
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_SPINLOCK(&key_table[key].lock);
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destructor = NULL;
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if (key_table[key].allocated &&
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(curthread->specific[key].data != NULL)) {
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if (curthread->specific[key].seqno ==
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key_table[key].seqno) {
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data = (void *) curthread->specific[key].data;
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destructor = key_table[key].destructor;
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}
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curthread->specific[key].data = NULL;
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curthread->specific_data_count--;
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}
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/* Unlock the key table entry: */
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_SPINUNLOCK(&key_table[key].lock);
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/*
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* If there is a destructore, call it
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* with the key table entry unlocked:
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*/
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if (destructor)
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destructor(data);
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} else {
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free(curthread->specific);
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curthread->specific = NULL;
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return;
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}
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}
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}
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if (curthread->specific != NULL) {
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free(curthread->specific);
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curthread->specific = NULL;
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}
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}
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static inline struct pthread_specific_elem *
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pthread_key_allocate_data(void)
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{
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struct pthread_specific_elem *new_data;
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new_data = (struct pthread_specific_elem *)
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malloc(sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX);
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if (new_data != NULL) {
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memset((void *) new_data, 0,
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sizeof(struct pthread_specific_elem) * PTHREAD_KEYS_MAX);
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}
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return (new_data);
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}
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int
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_pthread_setspecific(pthread_key_t key, const void *value)
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{
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struct pthread *pthread;
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int ret = 0;
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/* Point to the running thread: */
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pthread = _get_curthread();
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if ((pthread->specific) ||
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(pthread->specific = pthread_key_allocate_data())) {
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if (key < PTHREAD_KEYS_MAX) {
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if (key_table[key].allocated) {
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if (pthread->specific[key].data == NULL) {
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if (value != NULL)
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pthread->specific_data_count++;
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} else {
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if (value == NULL)
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pthread->specific_data_count--;
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}
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pthread->specific[key].data = value;
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pthread->specific[key].seqno =
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key_table[key].seqno;
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ret = 0;
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} else
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ret = EINVAL;
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} else
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ret = EINVAL;
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} else
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ret = ENOMEM;
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return (ret);
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}
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void *
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_pthread_getspecific(pthread_key_t key)
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{
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struct pthread *pthread;
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void *data;
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/* Point to the running thread: */
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pthread = _get_curthread();
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/* Check if there is specific data: */
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if (pthread->specific != NULL && key < PTHREAD_KEYS_MAX) {
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/* Check if this key has been used before: */
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if (key_table[key].allocated &&
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(pthread->specific[key].seqno == key_table[key].seqno)) {
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/* Return the value: */
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data = (void *) pthread->specific[key].data;
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} else {
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/*
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* This key has not been used before, so return NULL
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* instead:
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*/
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data = NULL;
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}
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} else
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/* No specific data has been created, so just return NULL: */
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data = NULL;
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return (data);
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}
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