--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailuis/emailui/inc/ceuiexitguardian.h	Thu Dec 17 08:39:21 2009 +0200
@@ -0,0 +1,126 @@
+/*
+* Copyright (c) 2007-2008 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:  FreestyleEmailUi exit guardian.
+*
+*/
+
+#ifndef C_EUIEXITGUARDIAN_H
+#define C_EUIEXITGUARDIAN_H
+
+#include <e32base.h>
+
+// FORWARD DECLARATIONS
+class CFreestyleEmailUiAppUi;
+class CIdle;
+
+/**
+ * Application exit guardian for email UI. This is needed because some routines
+ * in email framework create nested scheduler loops to hide asynchronity in
+ * them. When application is shutdown these nested levels may cause crashes
+ * as resources are freed while they are still being used on other recursion
+ * levels.
+ *
+ * Usage:
+ *
+ * void CClass::RoutineThatMayCreatedNestedLevelL()
+ *    {
+ *    iExitGuardian->EnterLC();
+ *    // call or execute code that may create nested sceduler loop
+ *    ...
+ *    // and finally popup and destroy cleanup item
+ *    CleanupStack::PopAndDestroy(); // iExitGuardian->EnterLC()
+ *    }
+ *
+ * @since S60 5.1
+ */
+class CEUiExitGuardian : public CBase
+  	{
+
+public:
+
+    /**
+     * Leave safe construction for CEuiExitGuardian.
+     * @return Newly created instance of CEuiExitGuardian
+     */
+    static CEUiExitGuardian* NewL(CFreestyleEmailUiAppUi& aAppUi);
+
+    /**
+     * Destructor.
+     */
+    ~CEUiExitGuardian();
+
+    /**
+     * Called before executing code that may cause new nested level in
+     * active scheduler. Leaves cleanup item in cleanup stack and this item
+     * must be purged by the caller after code execution. Cleanup item is used
+     * to make level counter leavesafe.
+     */
+    void EnterLC();
+
+    /**
+     * Called by the application to inform that application is ready to
+     * exit. If there is any nested active scheduler levels (i.e. recursion),
+     * exit execution will be delayed until every nested level has returned.
+     *
+     * @return KRequestPending if the exit execution is delayed because of
+     * nesting, KErrNone otherwise.
+     */
+    TInt ExitApplication();
+
+private:
+
+    /**
+     * Constructor.
+     */
+    CEUiExitGuardian(CFreestyleEmailUiAppUi& aAppUi);
+
+    /**
+     * Pass 2 constructor, may leave.
+     */
+	void ConstructL();
+
+    /**
+     * Static exit method that is given to cleanup item.
+     */
+    static void Exit(TAny* aPtr);
+
+    /**
+     * Non static exit method that is called from static Exit.
+     */
+    void DoExit();
+
+    /**
+     * Static callback method for CIdle. This is run when recursion is rewinded
+     * and appication can be closed.
+     */
+    static TInt IdleCallBack(TAny* aPtr);
+
+private:
+
+    // Reference to application UI
+    CFreestyleEmailUiAppUi& iAppUi;
+
+    // Recursion depth (nested level count)
+    TInt iEnterCount;
+
+    // ETrue if the application is ready to exit.
+    TBool iExitPending;
+
+    // Idle class instance to rewind final level of recursion before calling the
+    // exit
+    CIdle* iIdle;
+
+    };
+
+#endif // C_EUIEXITGUARDIAN_H