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/* ==== pthread_atexit.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 attribute functions.
*
* 1.20 94/02/13 proven
* -Started coding this file.
*/
#ifndef lint
static const char rcsid[] = "$Id$";
#endif
#define PTHREAD_KERNEL
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "pthreadutil.h"
static int pthread_atexit_inited = 0;
static pthread_key_t pthread_atexit_key;
static pthread_mutex_t pthread_atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
/* ==========================================================================
* pthread_atexit_done()
*/
static void pthread_atexit_done(void * arg)
{
pthread_atexit_t id, id_next;
for (id = arg; id; id = id_next) {
id_next = id->next;
id->rtn(id->arg);
free(id);
}
}
/* ==========================================================================
* pthread_atexit_add()
*/
int pthread_atexit_add(pthread_atexit_t *id, void (*rtn)(void *), void * arg)
{
int ret;
if (ret = pthread_mutex_lock(&pthread_atexit_mutex)) {
return(ret);
}
if (!pthread_atexit_inited) {
if (ret = pthread_key_create(&pthread_atexit_key, pthread_atexit_done)){
pthread_mutex_unlock(&pthread_atexit_mutex);
return(ret);
}
pthread_atexit_inited++;
}
pthread_mutex_unlock(&pthread_atexit_mutex);
if ((*id) = (pthread_atexit_t)malloc(sizeof(struct pthread_atexit))) {
if ((*id)->next = pthread_getspecific(pthread_atexit_key)) {
(*id)->next->prev = (*id);
}
pthread_setspecific(pthread_atexit_key, (void *)*id);
(*id)->prev = NULL;
(*id)->rtn = rtn;
(*id)->arg = arg;
return(OK);
}
return(ENOMEM);
}
/* ==========================================================================
* pthread_atexit_remove()
*/
int pthread_atexit_remove(pthread_atexit_t * id, int execute)
{
pthread_atexit_t old;
if (old = pthread_getspecific(pthread_atexit_key)) {
if (old == *id) {
old = old->next;
old->prev = NULL;
pthread_setspecific(pthread_atexit_key, old);
} else {
if ((*id)->next) {
(*id)->next->prev = (*id)->prev;
}
(*id)->prev->next = (*id)->next;
}
if (execute) {
(*id)->rtn((*id)->arg);
}
free((*id));
return(OK);
}
return(EINVAL);
}
/* ==========================================================================
* A few non void functions that are often used as void functions
*/
void fflush_nrv(void * fp) { fflush((FILE *)fp); }
void fclose_nrv(void * fp) { fclose((FILE *)fp); }
void pthread_attr_destroy_nrv(void * attr)
{
pthread_attr_destroy((pthread_attr_t *)attr);
}
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