* prelude.rb: add Thread.exclusive. This class method

is different from 1.8's.  Thread.exclusive only does
  synchronize with VM global mutex.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13257 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Aug 25 10:05:17 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* prelude.rb: add Thread.exclusive.  This class method
+	  is different from 1.8's.  Thread.exclusive only does
+	  synchronize with VM global mutex.
+
 Sat Aug 25 09:39:50 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* array.c (rb_ary_s_try_convert): more document description.

prelude.rb

@@ -10,3 +10,14 @@ class Mutex
   end
 end
 
+# Thread
+
+class Thread
+  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new
+  def self.exclusive
+    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
+      yield
+    }
+  end
+end
+