WIP

Author: byroot

bootstraptest/test_ractor.rb

@@ -2315,3 +2315,33 @@ def Warning.warn(msg)
   raise unless $msg.all?{/Ractor#take/ =~ it}
   $msg.size
 }
+
+# Cause lots of inline CC misses.
+assert_equal 'ok', <<~'RUBY'
+  class A; def test; 1 + 1; end; end
+  class B; def test; 1 + 1; end; end
+  class C; def test; 1 + 1; end; end
+  class D; def test; 1 + 1; end; end
+  class E; def test; 1 + 1; end; end
+  class F; def test; 1 + 1; end; end
+  class G; def test; 1 + 1; end; end
+
+  objs = [A.new, B.new, C.new, D.new, E.new, F.new, G.new].freeze
+
+  def call_test(obj)
+    obj.test
+  end
+
+  ractors = 7.times.map do
+    Ractor.new(objs) do |objs|
+      objs = objs.shuffle
+      100_000.times do
+        objs.each do |o|
+          call_test(o)
+        end
+      end
+    end
+  end
+  ractors.each(&:join)
+  :ok
+RUBY

vm_insnhelper.c

@@ -2165,7 +2165,7 @@ vm_lookup_cc(const VALUE klass, const struct rb_callinfo * const ci, ID mid)
     VALUE cc_tbl;
     struct rb_class_cc_entries *ccs;
 retry:
-    cc_tbl = RCLASS_WRITABLE_CC_TBL(klass);
+    cc_tbl = RUBY_ATOMIC_VALUE_LOAD(RCLASS_WRITABLE_CC_TBL(klass));
     ccs = NULL;
 
     if (cc_tbl) {
@@ -2210,6 +2210,8 @@ vm_lookup_cc(const VALUE klass, const struct rb_callinfo * const ci, ID mid)
             }
         }
     }
+
+    RB_GC_GUARD(cc_tbl);
     return NULL;
 }