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/* ==== specific.c =======================================================
* Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chris Provenzano.
* 4. The name of Chris Provenzano may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Description : Pthread thread specific data management.
*
* 1.20 94/03/30 proven
* -Started coding this file.
*/
#ifndef lint
static const char rcsid[] = "$Id$";
#endif
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
static struct pthread_key key_table[PTHREAD_DATAKEYS_MAX];
static pthread_mutex_t key_mutex = PTHREAD_MUTEX_INITIALIZER;
/* ==========================================================================
* pthread_key_create()
*/
int pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
{
pthread_mutex_lock(&key_mutex);
for ((*key) = 0; (*key) < PTHREAD_DATAKEYS_MAX; (*key)++) {
if (key_table[(*key)].count == 0) {
key_table[(*key)].count++;
key_table[(*key)].destructor = destructor;
pthread_mutex_init(&(key_table[(*key)].mutex), NULL);
pthread_mutex_unlock(&key_mutex);
return(OK);
}
}
pthread_mutex_unlock(&key_mutex);
return(EAGAIN);
}
/* ==========================================================================
* pthread_key_delete()
*/
int pthread_key_delete(pthread_key_t key)
{
int ret;
if (key < PTHREAD_DATAKEYS_MAX) {
pthread_mutex_lock(&(key_table[key].mutex));
switch (key_table[key].count) {
case 1:
pthread_mutex_destroy(&(key_table[key].mutex));
key_table[key].destructor = NULL;
key_table[key].count = 0;
case 0:
ret = OK;
break;
default:
ret = EBUSY;
}
pthread_mutex_unlock(&(key_table[key].mutex));
} else {
ret = EINVAL;
}
return(ret);
}
/* ==========================================================================
* pthread_cleanupspecific()
*/
void pthread_cleanupspecific(void)
{
void * data;
int key;
int itr;
pthread_mutex_lock(&key_mutex);
for (itr = 0; itr < _POSIX_THREAD_DESTRUTOR_ITERATIONS; itr++) {
for (key = 0; key < PTHREAD_DATAKEYS_MAX; key++) {
if (pthread_run->specific_data_count) {
if (pthread_run->specific_data[key]) {
data = (void *)pthread_run->specific_data[key];
pthread_run->specific_data[key] = NULL;
pthread_run->specific_data_count--;
if (key_table[key].destructor) {
pthread_mutex_unlock(&key_mutex);
key_table[key].destructor(data);
pthread_mutex_lock(&key_mutex);
}
key_table[key].count--;
}
} else {
free(pthread_run->specific_data);
pthread_mutex_unlock(&key_mutex);
return;
}
}
}
free(pthread_run->specific_data);
pthread_mutex_unlock(&key_mutex);
}
static inline const void ** pthread_key_allocate_data(void)
{
const void ** new_data;
if(new_data = (const void**)malloc(sizeof(void *) * PTHREAD_DATAKEYS_MAX)) {
memset((void *)new_data, 0, sizeof(void *) * PTHREAD_DATAKEYS_MAX);
}
return(new_data);
}
/* ==========================================================================
* pthread_setspecific()
*/
int pthread_setspecific(pthread_key_t key, const void * value)
{
int ret;
if ((pthread_run->specific_data) ||
(pthread_run->specific_data = pthread_key_allocate_data())) {
if ((key < PTHREAD_DATAKEYS_MAX) && (key_table)) {
pthread_mutex_lock(&(key_table[key].mutex));
if (key_table[key].count) {
if (pthread_run->specific_data[key] == NULL) {
if (value != NULL) {
pthread_run->specific_data_count++;
key_table[key].count++;
}
} else {
if (value == NULL) {
pthread_run->specific_data_count--;
key_table[key].count--;
}
}
pthread_run->specific_data[key] = value;
ret = OK;
} else {
ret = EINVAL;
}
pthread_mutex_unlock(&(key_table[key].mutex));
} else {
ret = EINVAL;
}
} else {
ret = ENOMEM;
}
return(ret);
}
/* ==========================================================================
* pthread_getspecific()
*/
void * pthread_getspecific(pthread_key_t key)
{
void *ret;
if ((pthread_run->specific_data) && (key < PTHREAD_DATAKEYS_MAX)
&& (key_table)) {
pthread_mutex_lock(&(key_table[key].mutex));
if (key_table[key].count) {
ret = (void *)pthread_run->specific_data[key];
} else {
ret = NULL;
}
pthread_mutex_unlock(&(key_table[key].mutex));
} else {
ret = NULL;
}
return(ret);
}
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