author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:44:11 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: The global lock class for messaging components |
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* |
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*/ |
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#ifndef MUIULOCK_H |
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#define MUIULOCK_H |
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class CRepository; |
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#include "MessagingInternalCRKeys.h" |
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// Lock identifier for messaging settings access |
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// |
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const TUid KMuiuLockSettings = { KCRUidMuiuVariationValue }; |
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/** |
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* The global lock class for messaging components |
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* |
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* The service can be used for creating runtime "locks" for protecting |
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* the shared resources over the process boundaries; i.e.the locks can be |
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* used for synchronisation between the processes. |
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* |
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* The current implementation is based on the transaction mechanism of |
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* Central Repository. The lock ID is the identifier of the repository |
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* file. The "lock" is created by opening a write transaction to the |
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* repository. Thus, the repository cannot be modified while the lock is on. |
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* |
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* @lib muiu_internal.lib |
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* @since S60 5.0 |
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*/ |
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NONSHARABLE_CLASS( CMuiuLock ) : public CBase |
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{ |
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public: |
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/** |
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* Creates a new instance of the class |
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* |
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* @since S60 5.0 |
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* @param aLockId The lock identifier. Currently, this has to be the ID |
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* of the existing central repository file that can be reserved |
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* for a write transaction while the lock is used. |
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* @return New instance of the class |
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*/ |
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IMPORT_C static CMuiuLock* NewL( TUid aLockId ); |
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|
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/** |
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* Destructor. Releases the lock if not done explicitly. |
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*/ |
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virtual ~CMuiuLock(); |
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/** |
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* Reserves the lock for the client. |
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* |
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* @since S60 5.0 |
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* @return Operation status. KErrNone if successful. KErrGeneral, if the lock |
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* is already reserved by the client. The error codes of the underlying |
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* services forwarded as such. |
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*/ |
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IMPORT_C TInt Reserve(); |
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/** |
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* Releases the lock |
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* |
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* @since S60 5.0 |
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*/ |
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IMPORT_C void Release(); |
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private: |
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/** |
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* Default constructor |
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* |
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* @since S60 5.0 |
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*/ |
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CMuiuLock(); |
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|
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/** |
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* Second phase constructor |
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* |
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* @since S60 5.0 |
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* @param aLockId See description of NewL() method |
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*/ |
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void ConstructL( TUid aLockId ); |
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private: // data |
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/** |
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* Central repository handle |
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*/ |
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CRepository* iRepository; |
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/** |
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* State flag indicating whether the lock is reserved or not |
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*/ |
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TBool iLocked; |
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}; |
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|
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#endif // MUIULOCK_H |