--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/core/ThreadNodes.java	Tue Jan 07 18:53:04 2014 +0100
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.nodes.core;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+
+@CoreClass(name = "Thread")
+public abstract class ThreadNodes {
+
+    @CoreMethod(names = "initialize", needsBlock = true, maxArgs = 0)
+    public abstract static class InitializeNode extends CoreMethodNode {
+
+        public InitializeNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public InitializeNode(InitializeNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public NilPlaceholder initialize(RubyThread thread, RubyProc block) {
+            thread.initialize(block);
+            return NilPlaceholder.INSTANCE;
+        }
+
+    }
+
+    @CoreMethod(names = "join", maxArgs = 0)
+    public abstract static class JoinNode extends CoreMethodNode {
+
+        public JoinNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public JoinNode(JoinNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public RubyThread join(RubyThread self) {
+            self.join();
+            return self;
+        }
+
+    }
+
+}