backport r24713 which adds a check for freelist exhaustion in gc_sweep; this prevents segfaults from certain tight loops. An example test case: Time.now while true

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@25871 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index 66ce2634cd..3372b7c279 100644
--- a/gc.c
+++ b/gc.c
@@ -1183,7 +1183,15 @@ gc_sweep()
     /* clear finalization list */
     if (final_list) {
 	deferred_final_list = final_list;
-	rb_thread_pending = 1;
+        if (!freelist && !rb_thread_critical) {
+          rb_gc_finalize_deferred();
+        }
+        else {
+	  rb_thread_pending = 1;
+        }
+        if (!freelist) {
+          add_heap();
+        }
 	return;
     }
     free_unused_heaps();