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-rw-r--r--libguile/finalizers.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/libguile/finalizers.c b/libguile/finalizers.c
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+/* Copyright (C) 2012 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/bdw-gc.h"
+#include "libguile/_scm.h"
+#include "libguile/finalizers.h"
+#include "libguile/gc.h"
+#include "libguile/threads.h"
+
+
+
+void
+scm_i_set_finalizer (void *obj, scm_t_finalizer_proc proc, void *data)
+{
+ GC_finalization_proc prev;
+ GC_PTR prev_data;
+ GC_REGISTER_FINALIZER_NO_ORDER (obj, proc, data, &prev, &prev_data);
+}
+
+struct scm_t_chained_finalizer
+{
+ int resuscitating_p;
+ scm_t_finalizer_proc proc;
+ void *data;
+ scm_t_finalizer_proc prev;
+ void *prev_data;
+};
+
+static void
+chained_finalizer (void *obj, void *data)
+{
+ struct scm_t_chained_finalizer *chained_data = data;
+ if (chained_data->resuscitating_p)
+ {
+ if (chained_data->prev)
+ scm_i_set_finalizer (obj, chained_data->prev, chained_data->prev_data);
+ chained_data->proc (obj, chained_data->data);
+ }
+ else
+ {
+ chained_data->proc (obj, chained_data->data);
+ if (chained_data->prev)
+ chained_data->prev (obj, chained_data->prev_data);
+ }
+}
+
+void
+scm_i_add_resuscitator (void *obj, scm_t_finalizer_proc proc, void *data)
+{
+ struct scm_t_chained_finalizer *chained_data;
+ chained_data = scm_gc_malloc (sizeof (*chained_data), "chained finalizer");
+ chained_data->resuscitating_p = 1;
+ chained_data->proc = proc;
+ chained_data->data = data;
+ GC_REGISTER_FINALIZER_NO_ORDER (obj, chained_finalizer, chained_data,
+ &chained_data->prev,
+ &chained_data->prev_data);
+}
+
+static void
+shuffle_resuscitators_to_front (struct scm_t_chained_finalizer *cd)
+{
+ while (cd->prev == chained_finalizer)
+ {
+ struct scm_t_chained_finalizer *prev = cd->prev_data;
+ scm_t_finalizer_proc proc = cd->proc;
+ void *data = cd->data;
+
+ if (!prev->resuscitating_p)
+ break;
+
+ cd->resuscitating_p = 1;
+ cd->proc = prev->proc;
+ cd->data = prev->data;
+
+ prev->resuscitating_p = 0;
+ prev->proc = proc;
+ prev->data = data;
+
+ cd = prev;
+ }
+}
+
+void
+scm_i_add_finalizer (void *obj, scm_t_finalizer_proc proc, void *data)
+{
+ struct scm_t_chained_finalizer *chained_data;
+ chained_data = scm_gc_malloc (sizeof (*chained_data), "chained finalizer");
+ chained_data->resuscitating_p = 0;
+ chained_data->proc = proc;
+ chained_data->data = data;
+ GC_REGISTER_FINALIZER_NO_ORDER (obj, chained_finalizer, chained_data,
+ &chained_data->prev,
+ &chained_data->prev_data);
+ shuffle_resuscitators_to_front (chained_data);
+}
+
+
+
+
+void
+scm_init_finalizers (void)
+{
+}