https://git.ruby-lang.org/ruby.git/commit/?id=7718e9588b

From 7718e9588b4d7d83c8f9a89dce10b06b9f97bddb Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Fri, 6 Nov 2020 03:21:08 +0900
Subject: a part of T_DATA object can Ractor#send

T_DATA objects can refer unshareable objects and they should be
copied recursively, however there is no way to replace with copied
unshareable objects. However, if a T_DATA object refers only
shareable objects, there is no need to replace. So this kind of
T_DATA object (such as Time, Dir, File::Status and so on) can be
sent by Ractor.send.

diff --git a/ractor.c b/ractor.c
index 5b05d98..c30f5ce 100644
--- a/ractor.c
+++ b/ractor.c
@@ -2181,6 +2181,24 @@ void rb_hash_transient_heap_evacuate(VALUE hash, int promote); https://github.com/ruby/ruby/blob/trunk/ractor.c#L2181
 void rb_struct_transient_heap_evacuate(VALUE st, int promote);
 #endif
 
+static void
+obj_refer_only_shareables_p_i(VALUE obj, void *ptr)
+{
+    int *pcnt = (int *)ptr;
+
+    if (!rb_ractor_shareable_p(obj)) {
+        pcnt++;
+    }
+}
+
+static int
+obj_refer_only_shareables_p(VALUE obj)
+{
+    int cnt = 0;
+    rb_objspace_reachable_objects_from(obj, obj_refer_only_shareables_p_i, &cnt);
+    return cnt == 0;
+}
+
 static int
 obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)
 {
@@ -2329,6 +2347,14 @@ obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data) https://github.com/ruby/ruby/blob/trunk/ractor.c#L2347
         break;
 
       case T_DATA:
+        if (!data->move && obj_refer_only_shareables_p(obj)) {
+            break;
+        }
+        else {
+            rb_raise(rb_eRactorError, "can not %s %"PRIsVALUE" object.",
+                     data->move ? "move" : "copy", rb_class_of(obj));
+        }
+
       case T_IMEMO:
         // not supported yet
         return 1;
-- 
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