TVar: use the new ThreadLocalVar to store the current transaction.

Author: chrisseaton

lib/concurrent/tvar.rb

@@ -1,7 +1,13 @@
+require 'concurrent/threadlocalvar'
+
 module Concurrent
 
   ABORTED = Object.new
 
+  CURRENT_TRANSACTION = ThreadLocalVar.new(nil)
+
+  UndoLogEntry = Struct.new(:tvar, :value)
+
   class TVar
 
     def initialize(value)
@@ -30,8 +36,6 @@ def unsafe_value=(value)
 
   end
 
-  UndoLogEntry = Struct.new(:tvar, :value)
-
   class Transaction
 
     LOCK = Mutex.new
@@ -74,11 +78,11 @@ def unlock
     end
 
     def self.current
-      Thread.current.thread_variable_get(:transaction)
+      CURRENT_TRANSACTION.value
     end
 
     def self.current=(transaction)
-      Thread.current.thread_variable_set(:transaction, transaction)
+      CURRENT_TRANSACTION.value = transaction
     end
 
   end