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* libguile/finalizers.h: * libguile/finalizers.c: New files. * libguile.h: * libguile/Makefile.am: Add to build.
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/* Copyright (C) 2012 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libguile/bdw-gc.h"
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#include "libguile/_scm.h"
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#include "libguile/finalizers.h"
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#include "libguile/gc.h"
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#include "libguile/threads.h"
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void
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scm_i_set_finalizer (void *obj, scm_t_finalizer_proc proc, void *data)
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{
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GC_finalization_proc prev;
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GC_PTR prev_data;
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GC_REGISTER_FINALIZER_NO_ORDER (obj, proc, data, &prev, &prev_data);
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}
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struct scm_t_chained_finalizer
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{
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int resuscitating_p;
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scm_t_finalizer_proc proc;
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void *data;
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scm_t_finalizer_proc prev;
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void *prev_data;
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};
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static void
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chained_finalizer (void *obj, void *data)
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{
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struct scm_t_chained_finalizer *chained_data = data;
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if (chained_data->resuscitating_p)
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{
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if (chained_data->prev)
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scm_i_set_finalizer (obj, chained_data->prev, chained_data->prev_data);
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chained_data->proc (obj, chained_data->data);
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}
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else
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{
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chained_data->proc (obj, chained_data->data);
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if (chained_data->prev)
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chained_data->prev (obj, chained_data->prev_data);
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}
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}
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void
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scm_i_add_resuscitator (void *obj, scm_t_finalizer_proc proc, void *data)
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{
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struct scm_t_chained_finalizer *chained_data;
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chained_data = scm_gc_malloc (sizeof (*chained_data), "chained finalizer");
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chained_data->resuscitating_p = 1;
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chained_data->proc = proc;
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chained_data->data = data;
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GC_REGISTER_FINALIZER_NO_ORDER (obj, chained_finalizer, chained_data,
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&chained_data->prev,
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&chained_data->prev_data);
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}
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static void
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shuffle_resuscitators_to_front (struct scm_t_chained_finalizer *cd)
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{
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while (cd->prev == chained_finalizer)
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{
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struct scm_t_chained_finalizer *prev = cd->prev_data;
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scm_t_finalizer_proc proc = cd->proc;
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void *data = cd->data;
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if (!prev->resuscitating_p)
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break;
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cd->resuscitating_p = 1;
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cd->proc = prev->proc;
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cd->data = prev->data;
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prev->resuscitating_p = 0;
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prev->proc = proc;
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prev->data = data;
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cd = prev;
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}
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}
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void
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scm_i_add_finalizer (void *obj, scm_t_finalizer_proc proc, void *data)
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{
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struct scm_t_chained_finalizer *chained_data;
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chained_data = scm_gc_malloc (sizeof (*chained_data), "chained finalizer");
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chained_data->resuscitating_p = 0;
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chained_data->proc = proc;
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chained_data->data = data;
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GC_REGISTER_FINALIZER_NO_ORDER (obj, chained_finalizer, chained_data,
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&chained_data->prev,
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&chained_data->prev_data);
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shuffle_resuscitators_to_front (chained_data);
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}
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void
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scm_init_finalizers (void)
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{
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}
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