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diff --git a/libstdc++-v3/testsuite/30_threads/unique_lock/locking/2.cc b/libstdc++-v3/testsuite/30_threads/unique_lock/locking/2.cc
new file mode 100644
index 00000000..28d1955a
--- /dev/null
+++ b/libstdc++-v3/testsuite/30_threads/unique_lock/locking/2.cc
@@ -0,0 +1,106 @@
+// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
+// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
+// { dg-require-cstdint "" }
+// { dg-require-gthreads "" }
+
+// Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+#include <mutex>
+#include <system_error>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  typedef std::mutex mutex_type;
+  typedef std::unique_lock<mutex_type> lock_type;
+
+  try
+    {
+      lock_type l;
+
+      // Lock unique_lock w/o mutex
+      try
+        {
+          l.lock();
+        }
+      catch (const std::system_error& ex)
+        {
+	  VERIFY( ex.code() == std::make_error_code
+		  (std::errc::operation_not_permitted) );
+        }
+      catch (...)
+        {
+          VERIFY( false );
+        }
+    }
+  catch (const std::system_error& e)
+    {
+      VERIFY( false );
+    }
+  catch (...)
+    {
+      VERIFY( false );
+    }
+}
+
+
+void test02()
+{
+  bool test __attribute__((unused)) = true;
+  typedef std::mutex mutex_type;
+  typedef std::unique_lock<mutex_type> lock_type;
+
+  try 
+    {
+      mutex_type m;
+      lock_type l(m);
+
+      // Lock already locked unique_lock.
+      try
+	{
+	  l.lock();
+	}
+      catch (const std::system_error& ex)
+	{
+	  VERIFY( ex.code() == std::make_error_code
+		  (std::errc::resource_deadlock_would_occur) );
+	}
+      catch (...)
+	{
+	  VERIFY( false );
+	}
+    }
+  catch (const std::system_error& e)
+    {
+      VERIFY( false );
+    }
+  catch (...)
+    {
+      VERIFY( false );
+    }
+}
+
+int main()
+{
+  test01();
+  test02();
+}