* test/ruby/test_thread.rb: add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17114 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Fri Jun 13 00:41:58 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* test/ruby/test_thread.rb: add a test.
+
 Thu Jun 12 23:30:11 2008  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* thread.c (mutex_unlock): fix cond_notified consistency.

test/ruby/test_thread.rb

@@ -439,6 +439,28 @@ class TestThread < Test::Unit::TestCase
     end
   end
 
+  def test_mutex_fifo_like_lock
+    m1 = Mutex.new
+    m2 = Mutex.new
+    m1.lock
+    m2.lock
+    m1.unlock
+    m2.unlock
+    assert_equal(false, m1.locked?)
+    assert_equal(false, m2.locked?)
+
+    m3 = Mutex.new
+    m1.lock
+    m2.lock
+    m3.lock
+    m1.unlock
+    m2.unlock
+    m3.unlock
+    assert_equal(false, m1.locked?)
+    assert_equal(false, m2.locked?)
+    assert_equal(false, m3.locked?)
+  end
+
   def test_recursive_error
     o = Object.new
     def o.inspect