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authorAndy Wingo <wingo@pobox.com>2017-03-13 15:47:51 +0100
committerAndy Wingo <wingo@pobox.com>2017-03-13 15:47:51 +0100
commitc9910c604279f438728cd268272e1839cbc53835 (patch)
treecb20e718574bacce1e9356d1b4585e4cbb5b4906 /libguile/weak-list.h
parente3374320415df973a6d8b0e1065b5b74e9e3e5e0 (diff)
downloadguile-c9910c604279f438728cd268272e1839cbc53835.tar.gz
Fix finalizer resuscitation causing excessive GC
* libguile/finalizers.c (async_gc_finalizer): (scm_i_register_async_gc_callback): Replace "weak gc callback" mechanism with "async gc callback" mechanism. Very similar but the new API is designed to be called a bounded number of times, to avoid running afoul of libgc heuristics. * libguile/weak-list.h: New internal header. * libguile/Makefile.am (noinst_HEADERS): Add weak-list.h. * libguile/weak-set.c (vacuum_all_weak_sets): (scm_c_make_weak_set, scm_init_weak_set): * libguile/weak-table.c (vacuum_all_weak_tables): (scm_c_make_weak_table, scm_init_weak_table): Arrange to vacuum all weak sets from a single async GC callback, and likewise for weak tables. Thanks to Ludovic Courtès for tracking this bug down!
Diffstat (limited to 'libguile/weak-list.h')
-rw-r--r--libguile/weak-list.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/libguile/weak-list.h b/libguile/weak-list.h
new file mode 100644
index 000000000..989cb7f0a
--- /dev/null
+++ b/libguile/weak-list.h
@@ -0,0 +1,73 @@
+/* classes: h_files */
+
+#ifndef SCM_WEAK_LIST_H
+#define SCM_WEAK_LIST_H
+
+/* Copyright (C) 2016 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
+ */
+
+
+
+#include "libguile/__scm.h"
+#include "libguile/weak-vector.h"
+
+
+
+static inline SCM
+scm_i_weak_cons (SCM car, SCM cdr)
+{
+ return scm_cons (scm_c_make_weak_vector (1, car), cdr);
+}
+
+static inline SCM
+scm_i_weak_car (SCM pair)
+{
+ return scm_c_weak_vector_ref (scm_car (pair), 0);
+}
+
+static inline void
+scm_i_visit_weak_list (SCM *list_loc, void (*visit) (SCM))
+{
+ SCM in = *list_loc, out = SCM_EOL;
+
+ while (scm_is_pair (in))
+ {
+ SCM car = scm_i_weak_car (in);
+ SCM cdr = scm_cdr (in);
+
+ if (!scm_is_eq (car, SCM_BOOL_F))
+ {
+ scm_set_cdr_x (in, out);
+ out = in;
+ visit (car);
+ }
+
+ in = cdr;
+ }
+
+ *list_loc = out;
+}
+
+
+#endif /* SCM_WEAK_LIST_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/