diff --git a/ChangeLog b/ChangeLog
index a360e46e25..efe43f5266 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun  8 15:23:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/timeout.rb (Timeout#timeout): propagate errors to the
+	  caller.  [ruby-dev:41010]'
+
 Tue Jun  8 15:15:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/net/smtp.rb (Net::SMTP#rcptto_list): fixed typo.
diff --git a/lib/timeout.rb b/lib/timeout.rb
index 5a99c28092..e60b4e3f13 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -56,8 +56,13 @@ module Timeout
     begin
       x = Thread.current
       y = Thread.start {
-        sleep sec
-        x.raise exception, "execution expired" if x.alive?
+        begin
+          sleep sec
+        rescue => e
+          x.raise e
+        else
+          x.raise exception, "execution expired" if x.alive?
+        end
       }
       yield sec
       #    return true
@@ -73,7 +78,10 @@ module Timeout
                                 # would be expected outside.
       raise Error, e.message, e.backtrace
     ensure
-      y.kill if y and y.alive?
+      if y and y.alive?
+        y.kill
+        y.join # make sure y is dead.
+      end
     end
   end
 
diff --git a/version.h b/version.h
index c0d9f70ea4..e56c88fe29 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2010-06-08"
 #define RUBY_VERSION_CODE 187
 #define RUBY_RELEASE_CODE 20100608
-#define RUBY_PATCHLEVEL 273
+#define RUBY_PATCHLEVEL 274
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8