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diff --git a/indexlib/lockfile.h b/indexlib/lockfile.h
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+#ifndef LPC_LOCKFILE_H1118420718_INCLUDE_GUARD_
+#define LPC_LOCKFILE_H1118420718_INCLUDE_GUARD_
+
+/* This file is part of indexlib.
+ * Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
+ *
+ * Indexlib is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation and available as file
+ * GPL_V2 which is distributed along with indexlib.
+ * 
+ * Indexlib 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 program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA
+ * 
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of this program with any edition of
+ * the Qt library by Trolltech AS, Norway (or with modified versions
+ * of Qt that use the same license as Qt), and distribute linked
+ * combinations including the two.  You must obey the GNU General
+ * Public License in all respects for all of the code used other than
+ * Qt.  If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.  If
+ * you do not wish to do so, delete this exception statement from
+ * your version.
+ */
+
+#include <string>
+
+namespace indexlib { namespace detail {
+
+/**
+ * Implements a simple, file based lock.
+ *
+ * Given a filename, it can be used to ensure that only one such file is in use at the time.
+ */
+class lockfile {
+	public:
+		/** Creates the object, doesn't actually do anything */
+		explicit lockfile( std::string name );
+
+		/** if locked, unlocks */
+		~lockfile();
+
+		/** Returns whether the file is locked */
+		bool locked() const;
+
+		/** Tries to lock the file returning true in case of success */
+		bool trylock();
+
+		/** Unlocks if you own the lock, otherwise it's a nop. */
+		void unlock();
+
+		/** This removes the lock, no matter what. */
+		void force_unlock();
+	private:
+		std::string filename_;
+		bool locked_;
+	
+};
+
+}}
+
+
+
+#endif /* LPC_LOCKFILE_H1118420718_INCLUDE_GUARD_ */