From: Eric Wong <normalperson@...>
Date: 2014-08-03T22:48:54+00:00
Subject: [ruby-core:64178] Re: [ruby-trunk - Feature #9894] [Open] [RFC] README.EXT: document rb_gc_register_mark_object

I tried making rb_gc_register_address work transparently but wasn't able
to measure any difference with unicorn.  unicorn uses a few global
const strings for common HTTP headers, but maybe not enough to matter
for this patch.

This patch is probably pointless, but in case somebody else wants to try
and show it makes a difference, it is here:

--- a/gc.c
+++ b/gc.c
@@ -5154,13 +5154,15 @@ rb_gc_register_mark_object(VALUE obj)
 void
 rb_gc_register_address(VALUE *addr)
 {
-    rb_objspace_t *objspace = &rb_objspace;
-    struct gc_list *tmp;
-
-    tmp = ALLOC(struct gc_list);
-    tmp->next = global_list;
-    tmp->varptr = addr;
-    global_list = tmp;
+    if (OBJ_FROZEN(*addr)) {
+	rb_gc_register_mark_object(*addr);
+    } else {
+	rb_objspace_t *objspace = &rb_objspace;
+	struct gc_list *tmp = ALLOC(struct gc_list);
+	tmp->next = global_list;
+	tmp->varptr = addr;
+	global_list = tmp;
+    }
 }
 
 void