pthread_atexit.c
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上传日期:2007-04-14
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文件大小:4k
- /* ==== 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);
- }