Index: lib/thread.rb
===================================================================
--- lib/thread.rb	(revision 39476)
+++ lib/thread.rb	(working copy)
@@ -165,6 +165,7 @@
         @que.push obj
         @cond.signal
       end
+      self
     end
   end
 
@@ -228,6 +229,7 @@
   #
   def clear
     @que.clear
+    self
   end
 
   #
@@ -315,6 +317,7 @@
         @que.push obj
         @cond.signal
       end
+      self
     end
   end
 
Index: test/thread/test_queue.rb
===================================================================
--- test/thread/test_queue.rb	(revision 39476)
+++ test/thread/test_queue.rb	(working copy)
@@ -107,4 +107,29 @@
       end
     }
   end
+
+  def test_queue_push_return_value
+    q = Queue.new
+    retval = q.push(1)
+    assert_same q, retval
+  end 
+
+  def test_queue_clear_return_value
+    q = Queue.new
+    retval = q.clear
+    assert_same q, retval
+  end
+
+  def test_sized_queue_push_return_value
+    q = SizedQueue.new(1)
+    retval = q.push(1)
+    assert_same q, retval
+  end
+
+  def test_sized_queue_clear_return_value
+    q = SizedQueue.new(1)
+    retval = q.clear
+    assert_same q, retval
+  end
+
 end