89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/* $NetBSD: cxa_thread_atexit.c,v 1.1 2017/07/11 15:21:35 joerg Exp $ */
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/*-
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* Copyright (c) 2017 Joerg Sonnenberger <joerg@NetBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: cxa_thread_atexit.c,v 1.1 2017/07/11 15:21:35 joerg Exp $");
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#include <sys/queue.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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#include "atexit.h"
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__dso_hidden bool __cxa_thread_atexit_used;
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struct cxa_dtor {
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SLIST_ENTRY(cxa_dtor) link;
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void *dso_symbol;
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void *obj;
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void (*dtor)(void *);
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};
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/* Assumes NULL initialization. */
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static __thread SLIST_HEAD(, cxa_dtor) cxa_dtors = SLIST_HEAD_INITIALIZER(cxa_dstors);
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void
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__cxa_thread_run_atexit(void)
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{
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struct cxa_dtor *entry;
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while ((entry = SLIST_FIRST(&cxa_dtors)) != NULL) {
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SLIST_REMOVE_HEAD(&cxa_dtors, link);
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(*entry->dtor)(entry->obj);
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if (entry->dso_symbol)
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__dl_cxa_refcount(entry->dso_symbol, -1);
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free(entry);
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}
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}
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/*
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* This dance is necessary since libstdc++ includes
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* __cxa_thread_atexit unconditionally.
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*/
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__weak_alias(__cxa_thread_atexit, __cxa_thread_atexit_impl)
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int __cxa_thread_atexit_impl(void (*)(void *), void *, void *);
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int
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__cxa_thread_atexit_impl(void (*dtor)(void *), void *obj, void *dso_symbol)
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{
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struct cxa_dtor *entry;
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__cxa_thread_atexit_used = true;
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entry = malloc(sizeof(*entry));
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if (entry == NULL)
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return -1;
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entry->dso_symbol = dso_symbol;
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if (dso_symbol)
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__dl_cxa_refcount(entry->dso_symbol, 1);
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entry->obj = obj;
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entry->dtor = dtor;
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SLIST_INSERT_HEAD(&cxa_dtors, entry, link);
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return 0;
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}
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