lib/timeout.rb: fallback to Timeout::Error

* lib/timeout.rb (Timeout::ExitException.catch): pass arguments
  for new instance.
* lib/timeout.rb (Timeout::ExitException#exception): fallback to
  Timeout::Error if couldn't throw.  [ruby-dev:47872] [Bug ruby#9380]
* lib/timeout.rb (Timeout#timeout): initialize ExitException with
  message for the fallback case.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog

Author: nobu

lib/timeout.rb

@@ -28,15 +28,23 @@ class Error < RuntimeError
   class ExitException < ::Exception # :nodoc:
     attr_reader :thread
 
-    def self.catch
-      exc = new
+    def self.catch(*args)
+      exc = new(*args)
       exc.instance_variable_set(:@thread, Thread.current)
       exc.freeze
       ::Kernel.catch(exc) {yield exc}
     end
 
     def exception(*)
-      throw(self, caller) if self.thread == Thread.current
+      if self.thread == Thread.current
+        bt = caller
+        begin
+          throw(self, bt)
+        rescue ArgumentError => e
+          raise unless e.message.start_with?("uncaught throw")
+          raise Error, message, backtrace
+        end
+      end
       self
     end
   end
@@ -95,7 +103,7 @@ def timeout(sec, klass = nil)   #:yield: +sec+
         bt = e.backtrace
       end
     else
-      bt = ExitException.catch(&bl)
+      bt = ExitException.catch(message, &bl)
     end
     rej = /\A#{Regexp.quote(__FILE__)}:#{__LINE__-4}\z/o
     bt.reject! {|m| rej =~ m}

test/test_timeout.rb

@@ -75,4 +75,15 @@ def test_exit_exception
       end
     end
   end
+
+  def test_enumerator_next
+    bug9380 = '[ruby-dev:47872] [Bug #9380]: timeout in Enumerator#next'
+    e = (o=Object.new).to_enum
+    def o.each
+      sleep
+    end
+    assert_raise_with_message(Timeout::Error, 'execution expired', bug9380) do
+      Timeout.timeout(0.01) {e.next}
+    end
+  end
 end