* thread.c (thread_join): raises ThreadError if target thread

is a current thread.
* test/ruby/test_thread.rb (test_thread_join_current):
  test for the above.
* NEWS: news for the above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37883 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Tue Nov 27 09:24:47 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* thread.c (thread_join): raises ThreadError if target thread
+	  is a current thread.
+	* test/ruby/test_thread.rb (test_thread_join_current):
+	  test for the above.
+	* NEWS: news for the above.
+
 Tue Nov 27 10:37:44 2012  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/fiddle/handle.c: Make Fiddle independent of DL, copy DL::Handle

NEWS

@@ -160,6 +160,7 @@ with all sufficient information, see the ChangeLog file.
     * incompatible changes:
       * Thread#join no longer allows to be used from trap handler. Now it raises
         ThreadError.
+      * Thread#join raises ThreadError if target therad is a current thread.
 
   * Time
     * change return value:

test/ruby/test_thread.rb

@@ -876,6 +876,9 @@ class TestThreadGroup < Test::Unit::TestCase
     }
   end
 
-
-
+  def test_thread_join_current
+    assert_raises(ThreadError) do
+      Thread.current.join
+    end
+  end
 end

thread.c

@@ -736,6 +736,10 @@ thread_join(rb_thread_t *target_th, double delay)
     rb_thread_t *th = GET_THREAD();
     struct join_arg arg;
 
+    if (th == target_th) {
+	rb_raise(rb_eThreadError, "Target thread must not be current thread");
+    }
+
     arg.target = target_th;
     arg.waiting = th;
     arg.limit = timeofday() + delay;