MVar uses synchronization layer.

Author: jdantonio

lib/concurrent/mvar.rb

@@ -1,4 +1,5 @@
 require 'concurrent/concern/dereferenceable'
+require 'concurrent/synchronization'
 
 module Concurrent
 
@@ -34,9 +35,9 @@ module Concurrent
   # 2. S. Peyton Jones, A. Gordon, and S. Finne. [Concurrent Haskell](http://dl.acm.org/citation.cfm?id=237794).
   #    In Proceedings of the 23rd Symposium on Principles of Programming Languages
   #    (PoPL), 1996.
-  class MVar
-
+  class MVar < Synchronization::Object
     include Concern::Dereferenceable
+    safe_initialization!
 
     # Unique value that represents that an `MVar` was empty
     EMPTY = Object.new