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+/****************************************************************************
+**
+** Definition of QLock class. This manages interprocess locking
+**
+** Created : 20000406
+**
+** Copyright (C) 2000-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the kernel module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with
+** the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#ifndef QLOCK_P_H
+#define QLOCK_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  This header file may
+// change from version to version without notice, or even be
+// removed.
+//
+// We mean it.
+//
+//
+
+#ifndef QT_H
+#include "qstring.h"
+#endif // QT_H
+
+class QLockData;
+
+class QLock
+{
+public:
+    QLock( const QString &filename, char id, bool create = FALSE );
+    ~QLock();
+
+    enum Type { Read, Write };
+
+    bool isValid() const;
+    void lock( Type type );
+    void unlock();
+    bool locked() const;
+
+private:
+    Type type;
+    QLockData *data;
+};
+
+
+// Nice class for ensuring the lock is released.
+// Just create one on the stack and the lock is automatically released
+// when QLockHolder is destructed.
+class QLockHolder
+{
+public:
+    QLockHolder( QLock *l, QLock::Type type ) : qlock(l) {
+	qlock->lock( type );
+    }
+    ~QLockHolder() { if ( locked() ) qlock->unlock(); }
+
+    void lock( QLock::Type type ) { qlock->lock( type ); }
+    void unlock() { qlock->unlock(); }
+    bool locked() const { return qlock->locked(); }
+
+private:
+    QLock *qlock;
+};
+
+#endif
+