timeout.rb: current_target

* lib/timeout.rb (Timeout::ExitException#target): rename attribute.

* lib/timeout.rb (Timeout::ExitException.current_target): extract a
  method to achieve the target.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/timeout.rb

@@ -26,17 +26,21 @@ module Timeout
   class Error < RuntimeError
   end
   class ExitException < ::Exception # :nodoc:
-    attr_reader :thread
+    attr_reader :target
+
+    def self.current_target
+      Thread.current
+    end
 
     def self.catch
       exc = new
-      exc.instance_variable_set(:@thread, Thread.current)
+      exc.instance_variable_set(:@target, current_target)
       exc.freeze
       ::Kernel.catch(exc) {yield exc}
     end
 
     def exception(*)
-      throw(self, caller) if self.thread == Thread.current
+      throw(self, caller) if self.target == self.class.current_target
       self
     end
   end