thread.c: Mutex#synchronize no block params

* thread.c (rb_mutex_synchronize_m): yield no block params.  patch by
  splattael (Peter Suschlik) in [ruby-core:53773] [Bug #8097].
  fix GH-266.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40000 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Mar 29 22:09:46 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread.c (rb_mutex_synchronize_m): yield no block params.  patch by
+	  splattael (Peter Suschlik) in [ruby-core:53773] [Bug #8097].
+	  fix GH-266.
+
 Fri Mar 29 16:51:39 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (argf_next_argv): set init flag if succeeded to forward, after

test/ruby/test_thread.rb

@@ -120,6 +120,11 @@ def test_mutex_synchronize
     assert_equal(max * max * max, r)
   end
 
+  def test_mutex_synchronize_yields_no_block_params
+    bug8097 = '[ruby-core:53424] [Bug #8097]'
+    assert_empty(Mutex.new.synchronize {|*params| break params}, bug8097)
+  end
+
   def test_local_barrier
     dir = File.dirname(__FILE__)
     lbtest = File.join(dir, "lbtest.rb")

thread.c

@@ -4567,7 +4567,7 @@ rb_mutex_synchronize_m(VALUE self, VALUE args)
 	rb_raise(rb_eThreadError, "must be called with a block");
     }
 
-    return rb_mutex_synchronize(self, rb_yield, Qnil);
+    return rb_mutex_synchronize(self, rb_yield, Qundef);
 }
 
 void rb_mutex_allow_trap(VALUE self, int val)