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diff --git a/storage/mroonga/lib/mrn_external_lock.hpp b/storage/mroonga/lib/mrn_external_lock.hpp
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+++ b/storage/mroonga/lib/mrn_external_lock.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2012 Kentoku SHIBA
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#ifndef MRN_EXTERNAL_LOCK_HPP_
+#define MRN_EXTERNAL_LOCK_HPP_
+
+#include <mrn_mysql.h>
+
+namespace mrn {
+  class ExternalLock {
+    THD *thd_;
+    handler *handler_;
+    int lock_type_;
+    int error_;
+  public:
+    ExternalLock(THD *thd, handler *handler, int lock_type);
+    ~ExternalLock();
+    int error();
+  };
+}
+
+#endif // MRN_EXTERNAL_LOCK_HPP_