diff -r 000000000000 -r 1bce908db942 natfw/natfwstunturnclient/src/casynccallback.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natfw/natfwstunturnclient/src/casynccallback.cpp	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,218 @@
+/*
+* Copyright (c) 2005 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:    
+*
+*/
+
+
+
+
+#include "natfwstunclientobserver.h"
+#include "casynccallback.h"
+#include "stunassert.h"
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::NewL
+// -----------------------------------------------------------------------------
+//
+CAsyncCallback* CAsyncCallback::NewL( MSTUNClientObserver& aObserver )
+    {
+    CAsyncCallback* self = new (ELeave) CAsyncCallback( aObserver );
+    CActiveScheduler::Add( self );
+    self->WaitForRequests();
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::CAsyncCallback
+// -----------------------------------------------------------------------------
+//
+CAsyncCallback::CAsyncCallback( MSTUNClientObserver& aObserver ) :
+    CActive( EPriorityStandard ),
+    iObserver( aObserver ),
+    iPendingCallbacks( _FOFF( TSTUNCallbackInfo, iLink ) )
+    {
+    }
+
+// ---------------------------------------------------------------------------
+// CAsyncCallback::CAsyncCallback
+// Dummy implementation. Default constructor is declared private and not used.
+// ---------------------------------------------------------------------------
+//
+CAsyncCallback::CAsyncCallback() :
+    CActive( EPriorityStandard ),
+    iObserver( *( MSTUNClientObserver* )0x1 )
+    {
+    }
+
+// ---------------------------------------------------------------------------
+// CAsyncCallback::CAsyncCallback
+// Dummy implementation, as copy constructor is declared private and not used.
+// ---------------------------------------------------------------------------
+//
+CAsyncCallback::CAsyncCallback( const CAsyncCallback& aAsyncCallback ) :
+    CActive( EPriorityStandard ),
+    iObserver( aAsyncCallback.iObserver )
+    {    
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::~CAsyncCallback
+// -----------------------------------------------------------------------------
+//
+CAsyncCallback::~CAsyncCallback()
+    {
+    Cancel();
+
+    TSTUNCallbackInfo* callback = iPendingCallbacks.First();
+    while ( iPendingCallbacks.IsFirst( callback ) &&
+            !iPendingCallbacks.IsEmpty() )
+        {
+        iPendingCallbacks.Remove( *callback );
+        delete callback;
+        callback = iPendingCallbacks.First();
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::DoCancel
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::DoCancel()
+    {
+    if ( iStatus == KRequestPending )
+        {
+        TRequestStatus* status = &iStatus;    
+        User::RequestComplete( status, KErrCancel );
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::RunL
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::RunL()
+    {
+    WaitForRequests();
+    ExecuteFirstCallback();
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::RunError
+// Currently RunL cannot leave.
+// -----------------------------------------------------------------------------
+//
+TInt CAsyncCallback::RunError( TInt aError )
+    {
+    if ( aError == KErrNoMemory )
+        {
+        return aError;
+        }
+    return KErrNone;
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::MakeCallbackL
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::MakeCallbackL( TSTUNCallbackInfo::TFunction aFunction,
+                                    const CBinding* aBinding,
+                                    TInt aErrorCode,
+                                    const CSTUNClient* aClient )
+    {    
+    TSTUNCallbackInfo* callback = new ( ELeave ) TSTUNCallbackInfo( aFunction,
+                                                                    aBinding,
+                                                                    aErrorCode,
+                                                                    aClient );
+    CleanupStack::PushL( callback );
+    __STUN_ASSERT_L( callback->Validate(), KErrArgument );
+    CleanupStack::Pop( callback );
+
+    //CActive::iActive won't tell whether User::RequestComplete has already
+    //been called, so iStatus is inspected to see whether a previous call to
+    //AddDeleteRequestL has already called User::RequestComplete.
+    if ( iStatus == KRequestPending )
+        {
+        Wakeup();
+        }
+
+    iPendingCallbacks.AddLast( *callback );
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::CancelCallback
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::CancelCallback( const CBinding& aBinding )
+    {
+    TSglQueIter<TSTUNCallbackInfo> iter( iPendingCallbacks );
+
+    for ( TSTUNCallbackInfo* callback = iter++; callback; callback = iter++ )
+        {
+        if ( callback->iBinding == &aBinding )
+            {
+            iPendingCallbacks.Remove( *callback );
+            delete callback;
+            }
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::ExecuteFirstCallback
+// Handle one callback request and wait for the next one. If there are more
+// callbacks, complete the asynchronous request so that RunL will soon be called
+// again. Don't call more than one callback, since upper layer might've deleted
+// STUN client, causing CAsyncCallback to be deleted too. For the same reason
+// nothing is done after executing the callback.
+// -----------------------------------------------------------------------------
+//    
+void CAsyncCallback::ExecuteFirstCallback()
+    {
+    TSTUNCallbackInfo* callback = iPendingCallbacks.First();
+    if ( iPendingCallbacks.IsFirst( callback ) &&
+         !iPendingCallbacks.IsEmpty() )
+        {
+        iPendingCallbacks.Remove( *callback );
+        
+        if ( !iPendingCallbacks.IsEmpty() )
+            {
+            Wakeup();
+            }
+
+        callback->Execute( iObserver );
+        delete callback;
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::WaitForRequests
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::WaitForRequests()
+    {
+    __STUN_ASSERT_RETURN( !IsActive(), KErrNotReady );
+
+    iStatus = KRequestPending;
+    SetActive();
+    }
+
+// -----------------------------------------------------------------------------
+// CAsyncCallback::Wakeup
+// -----------------------------------------------------------------------------
+//
+void CAsyncCallback::Wakeup()
+    {
+    TRequestStatus* status = &iStatus;
+    User::RequestComplete( status, KErrNone );
+    }