diff -r ebe688cedc25 -r 7fdbb852d323 messagingappbase/msgavkon/muiu_internal/servicesinternal/inc/MuiuLock.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/messagingappbase/msgavkon/muiu_internal/servicesinternal/inc/MuiuLock.h	Wed Sep 01 12:31:54 2010 +0100
@@ -0,0 +1,110 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:   The global lock class for messaging components
+*
+*/
+
+
+
+#ifndef MUIULOCK_H
+#define MUIULOCK_H
+
+class CRepository;
+
+#include "MessagingInternalCRKeys.h"
+
+
+// Lock identifier for messaging settings access
+//
+const TUid KMuiuLockSettings = { KCRUidMuiuVariationValue };
+
+/**
+ *  The global lock class for messaging components
+ *
+ *  The service can be used for creating runtime "locks" for protecting
+ *  the shared resources over the process boundaries; i.e.the locks can be 
+ *  used for synchronisation between the processes.
+ *
+ *  The current implementation is based on the transaction mechanism of
+ *  Central Repository. The lock ID is the identifier of the repository
+ *  file. The "lock" is created by opening a write transaction to the
+ *  repository. Thus, the repository cannot be modified while the lock is on.
+ *
+ *  @lib muiu_internal.lib
+ *  @since S60 5.0
+ */
+NONSHARABLE_CLASS( CMuiuLock ) : public CBase
+    {
+public:
+    /**
+     * Creates a new instance of the class
+     *
+     * @since S60 5.0
+     * @param aLockId    The lock identifier. Currently, this has to be the ID
+     *                   of the existing central repository file that can be reserved
+     *                   for a write transaction while the lock is used.
+     * @return           New instance of the class
+     */
+     IMPORT_C static CMuiuLock* NewL( TUid aLockId );
+
+    /**
+     * Destructor. Releases the lock if not done explicitly.
+     */
+    virtual ~CMuiuLock();
+
+    /**
+     * Reserves the lock for the client.
+     *
+     * @since S60 5.0
+     * @return           Operation status. KErrNone if successful. KErrGeneral, if the lock
+     *                   is already reserved by the client. The error codes of the underlying
+     *                   services forwarded as such.
+     */
+    IMPORT_C TInt Reserve();
+
+    /**
+     * Releases the lock
+     *
+     * @since S60 5.0
+     */
+    IMPORT_C void Release();
+
+private:
+    /**
+     * Default constructor
+     *
+     * @since S60 5.0
+     */
+    CMuiuLock();
+    
+    /**
+     *  Second phase constructor
+     *
+     * @since S60 5.0
+     * @param aLockId    See description of NewL() method
+     */
+    void ConstructL( TUid aLockId );
+private: // data
+    /**
+     * Central repository handle
+     */
+    CRepository* iRepository;
+
+    /**
+     * State flag indicating whether the lock is reserved or not
+     */
+    TBool iLocked;
+    };
+
+#endif // MUIULOCK_H