key.c
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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime library.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s): Silicon Graphics, Inc.
*
* Portions created by SGI are Copyright (C) 2000-2001 Silicon
* Graphics, Inc. All Rights Reserved.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/*
* This file is derived directly from Netscape Communications Corporation,
* and consists of extensive modifications made during the year(s) 1999-2000.
*/
#include <stdlib.h>
#include <errno.h>
#include "common.h"
/*
* Destructor table for per-thread private data
*/
static _st_destructor_t _st_destructors[ST_KEYS_MAX];
static int key_max = 0;
/*
* Return a key to be used for thread specific data
*/
int st_key_create(int *keyp, _st_destructor_t destructor)
{
if (key_max >= ST_KEYS_MAX) {
errno = EAGAIN;
return -1;
}
*keyp = key_max++;
_st_destructors[*keyp] = destructor;
return 0;
}
int st_key_getlimit(void)
{
return ST_KEYS_MAX;
}
int st_thread_setspecific(int key, void *value)
{
_st_thread_t *me = _ST_CURRENT_THREAD();
if (key < 0 || key >= key_max) {
errno = EINVAL;
return -1;
}
if (value != me->private_data[key]) {
/* free up previously set non-NULL data value */
if (me->private_data[key] && _st_destructors[key]) {
(*_st_destructors[key])(me->private_data[key]);
}
me->private_data[key] = value;
}
return 0;
}
void *st_thread_getspecific(int key)
{
if (key < 0 || key >= key_max) {
return NULL;
}
return ((_ST_CURRENT_THREAD())->private_data[key]);
}
/*
* Free up all per-thread private data
*/
void _st_thread_cleanup(_st_thread_t *thread)
{
int key;
for (key = 0; key < key_max; key++) {
if (thread->private_data[key] && _st_destructors[key]) {
(*_st_destructors[key])(thread->private_data[key]);
thread->private_data[key] = NULL;
}
}
}