diff -r 000000000000 -r 32704c33136d iaupdate/IAD/ui/src/iaupdategloballockhandler.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/iaupdate/IAD/ui/src/iaupdategloballockhandler.cpp	Tue Jan 26 12:06:03 2010 +0200
@@ -0,0 +1,174 @@
+/*
+* Copyright (c) 2008 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:   This module contains the implementation of CIAUpdateGlobalLockHandler class 
+*                member functions.
+*
+*/
+
+
+//INCLUDES
+#include <e32property.h>
+#include <apgwgnam.h>
+
+#include "iaupdategloballockhandler.h"
+#include "iaupdateuids.h"
+#include "iaupdatedebug.h"
+
+//CONSTANTS
+const TUid KPSUid = { KIAUpdateUiUid };
+const TUint32 KIAUpdateGlobalLock = 0x00000001;
+const TUid KSid = { KIAUpdateUiUid };
+
+//MACROS
+_LIT_SECURITY_POLICY_PASS( KReadPolicy );
+_LIT_SECURITY_POLICY_S0( KWritePolicy, (TSecureId ) KSid );
+
+
+// ================= MEMBER FUNCTIONS =======================
+
+// ---------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::NewL
+// Two-phased constructor.
+// ---------------------------------------------------------------------------
+//
+CIAUpdateGlobalLockHandler* CIAUpdateGlobalLockHandler::NewL()
+    {
+    CIAUpdateGlobalLockHandler* self = CIAUpdateGlobalLockHandler::NewLC();
+    CleanupStack::Pop( self );
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::NewLC
+// Two-phased constructor.
+// -----------------------------------------------------------------------------
+//
+CIAUpdateGlobalLockHandler* CIAUpdateGlobalLockHandler::NewLC()
+    {
+    CIAUpdateGlobalLockHandler* self = new( ELeave ) CIAUpdateGlobalLockHandler();
+    CleanupStack::PushL( self );
+    self->ConstructL();
+    return self;
+    }
+
+
+
+// ---------------------------------------------------------------------------
+//  CIAUpdateGlobalLockHandler::ConstructL
+// ---------------------------------------------------------------------------
+//
+void CIAUpdateGlobalLockHandler::ConstructL()
+    {
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::ConstructL() begin");
+    TInt err = RProperty::Define( KPSUid, 
+                                  KIAUpdateGlobalLock, 
+                                  RProperty::EInt,
+                                  KReadPolicy,
+                                  KWritePolicy );	
+    if ( err != KErrNone && err != KErrAlreadyExists )
+        {		
+        User::Leave( err );	
+        }
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::ConstructL() end");   
+    }    
+
+// ---------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::CIAUpdateGlobalLockHandler
+// constructor
+// ---------------------------------------------------------------------------
+//
+CIAUpdateGlobalLockHandler::CIAUpdateGlobalLockHandler()  
+    {
+    iEikEnv = CEikonEnv::Static();
+    }
+
+// ---------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::~CIAUpdateGlobalLockHandler
+// Destructor
+// ---------------------------------------------------------------------------
+//
+CIAUpdateGlobalLockHandler::~CIAUpdateGlobalLockHandler()
+    {
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::~CIAUpdateGlobalLockHandler() begin");
+    if ( iSetAsLocked )
+        {
+    	TRAP_IGNORE( SetToInUseForAnotherInstancesL( EFalse ) );
+        }
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::~CIAUpdateGlobalLockHandler() end");    
+    }
+
+
+// ---------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::InUseByAnotherInstanceL
+// 
+// ---------------------------------------------------------------------------
+//  
+TBool CIAUpdateGlobalLockHandler::InUseByAnotherInstanceL()
+    {
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::InUseByAnotherInstanceL() begin");
+	TBool inUse = EFalse;
+	TInt wgId = 0;  //zero value means that global lock is off 
+	User::LeaveIfError( RProperty::Get( KPSUid, 
+                                        KIAUpdateGlobalLock, 
+                                        wgId ) );
+    if ( wgId > 0 && wgId != iEikEnv->RootWin().Identifier() )
+        {
+    	// another iaupdate instance has set a lock
+    	// to be checked that instance is still running
+    	TInt prevWgId = 0;
+    	while ( ( prevWgId != KErrNotFound ) && ( !inUse ) )
+    	    {
+    	    CApaWindowGroupName::FindByAppUid( KSid, iEikEnv->WsSession(), prevWgId );	
+    	    if ( prevWgId == wgId )
+    	        {
+    	    	inUse = ETrue;
+    	    	IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::InUseByAnotherInstanceL() IAUPDATE locked by another instance");
+    	        }
+    	    }
+    	}
+	IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::InUseByAnotherInstanceL() end");
+	return inUse;
+    }
+    
+// ---------------------------------------------------------------------------
+// CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL
+// 
+// ---------------------------------------------------------------------------
+//  
+void CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL( TBool aInUse )
+    {
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL() begin");
+    TInt wgId = 0;  //zero value means that global lock is off   
+    if ( aInUse )
+        {
+    	wgId = iEikEnv->RootWin().Identifier();
+        }
+    
+    User::LeaveIfError( RProperty::Set( KPSUid, 
+                                        KIAUpdateGlobalLock, 
+                                        wgId ) );
+    if ( wgId == 0 )
+        {
+        IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL() Set as unlocked");
+    	iSetAsLocked = EFalse;
+        }
+    else
+        {
+        IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL() Set as locked");
+        iSetAsLocked = ETrue; 	
+        }
+    IAUPDATE_TRACE("[IAUPDATE] CIAUpdateGlobalLockHandler::SetToInUseForAnotherInstancesL() end");
+    }
+    
+// End of File