1 files changed, 4 insertions, 1 deletions
diff --git a/lib/thread.rb b/lib/thread.rb
index 34c2a506d2..4f296bb8b3 100644
--- a/lib/thread.rb
+++ b/lib/thread.rb
@@ -70,6 +70,7 @@ class ConditionVariable
       end
       mutex.sleep timeout
     end
+    self
   end
 
   #
@@ -82,6 +83,7 @@ class ConditionVariable
     rescue ThreadError
       retry
     end
+    self
   end
 
   #
@@ -96,10 +98,11 @@ class ConditionVariable
     end
     for t in waiters0
       begin
-	t.run
+        t.run
       rescue ThreadError
       end
     end
+    self
   end
 end