thread_safe.rb in l2meter-0.2.3

- old
+ new

@@ -1,4 +1,6 @@
+require "forwardable"
+
 module L2meter
   # This class is a wrapper around Emitter that makes sure that we have a
   # completely separate clone of Emitter per thread running. It doesn't truly
   # make Emitter thread-safe, it makes sure that you don't access the same
   # instance of emitter from different threads.