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/* $OpenBSD: uthread_spec.c,v 1.6 1999/11/25 07:01:46 d Exp $ */
/*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* 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 John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
*
* $FreeBSD: uthread_spec.c,v 1.13 1999/08/28 00:03:52 peter Exp $
*/
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
/* Static variables: */
static struct pthread_key key_table[PTHREAD_KEYS_MAX];
int
pthread_key_create(pthread_key_t * key, void (*destructor) (void *))
{
for ((*key) = 0; (*key) < PTHREAD_KEYS_MAX; (*key)++) {
/* Lock the key table entry: */
_SPINLOCK(&key_table[*key].lock);
if (key_table[(*key)].allocated == 0) {
key_table[(*key)].allocated = 1;
key_table[(*key)].destructor = destructor;
/* Unlock the key table entry: */
_SPINUNLOCK(&key_table[*key].lock);
return (0);
}
/* Unlock the key table entry: */
_SPINUNLOCK(&key_table[*key].lock);
}
return (EAGAIN);
}
int
pthread_key_delete(pthread_key_t key)
{
int ret = 0;
if (key < PTHREAD_KEYS_MAX) {
/* Lock the key table entry: */
_SPINLOCK(&key_table[key].lock);
if (key_table[key].allocated)
key_table[key].allocated = 0;
else
ret = EINVAL;
/* Unlock the key table entry: */
_SPINUNLOCK(&key_table[key].lock);
} else
ret = EINVAL;
return (ret);
}
void
_thread_cleanupspecific(void)
{
void *data;
int key;
int itr;
void (*destructor)( void *);
for (itr = 0; itr < PTHREAD_DESTRUCTOR_ITERATIONS; itr++) {
for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
if (_thread_run->specific_data_count) {
/* Lock the key table entry: */
_SPINLOCK(&key_table[key].lock);
destructor = data = NULL;
if (key_table[key].allocated) {
if (_thread_run->specific_data[key]) {
data = (void *) _thread_run->specific_data[key];
_thread_run->specific_data[key] = NULL;
_thread_run->specific_data_count--;
destructor = key_table[key].destructor;
}
}
/* Unlock the key table entry: */
_SPINUNLOCK(&key_table[key].lock);
/*
* If there is a destructore, call it
* with the key table entry unlocked:
*/
if (destructor)
destructor(data);
} else {
free(_thread_run->specific_data);
_thread_run->specific_data = NULL;
return;
}
}
}
free(_thread_run->specific_data);
_thread_run->specific_data = NULL;
}
static inline const void **
pthread_key_allocate_data(void)
{
const void **new_data;
if ((new_data = (const void **) malloc(sizeof(void *) * PTHREAD_KEYS_MAX)) != NULL) {
memset((void *) new_data, 0, sizeof(void *) * PTHREAD_KEYS_MAX);
}
return (new_data);
}
int
pthread_setspecific(pthread_key_t key, const void *value)
{
pthread_t pthread;
int ret = 0;
/* Point to the running thread: */
pthread = _thread_run;
if ((pthread->specific_data) ||
(pthread->specific_data = pthread_key_allocate_data())) {
if (key < PTHREAD_KEYS_MAX) {
if (key_table[key].allocated) {
if (pthread->specific_data[key] == NULL) {
if (value != NULL)
pthread->specific_data_count++;
} else {
if (value == NULL)
pthread->specific_data_count--;
}
pthread->specific_data[key] = value;
ret = 0;
} else
ret = EINVAL;
} else
ret = EINVAL;
} else
ret = ENOMEM;
return (ret);
}
void *
pthread_getspecific(pthread_key_t key)
{
pthread_t pthread;
void *data;
/* Point to the running thread: */
pthread = _thread_run;
/* Check if there is specific data: */
if (pthread->specific_data != NULL && key < PTHREAD_KEYS_MAX) {
/* Check if this key has been used before: */
if (key_table[key].allocated) {
/* Return the value: */
data = (void *) pthread->specific_data[key];
} else {
/*
* This key has not been used before, so return NULL
* instead:
*/
data = NULL;
}
} else
/* No specific data has been created, so just return NULL: */
data = NULL;
return (data);
}
#endif
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