--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-18182059-859D-51CF-A940-D230D9F9CF8C.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"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: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-18182059-859D-51CF-A940-D230D9F9CF8C" xml:lang="en"><title>How
+to allocate and de-allocate cleanup stacks</title><shortdesc>This document describes when and how a cleanup stack should be
+allocated and de-allocated.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The main categories of programs (GUI applications and servers) both have
+cleanup stacks created for them as part of their respective frameworks. Simple
+console programs for test and demonstration purposes though require a cleanup
+stack to be explicitly allocated. </p>
+<p>Allocate the stack at the beginning of the thread as follows:</p>
+<codeblock id="GUID-204BB8EA-016F-53CA-BB22-17B685BFF18A" xml:space="preserve">TheTrapCleanup=CTrapCleanup::New();</codeblock>
+<p>De-allocate the cleanup stack at the end of the thread as follows:</p>
+<codeblock id="GUID-C8A45849-E86C-5DA6-B1A5-88113B06C2B7" xml:space="preserve">delete TheTrapCleanup;</codeblock>
+<section id="GUID-9E86AB70-D551-4356-9001-749FBE8B2DCE"><title>Notes</title> <ul>
+<li id="GUID-37929EEE-F608-5754-9324-6731FEA5B1B2"><p>This explicit allocation
+and de-allocation is necessary for threads which use cleanup processing. Threads
+which do not use cleanup stack processing need not allocate a cleanup stack. </p> </li>
+<li id="GUID-6B30E7F5-1D29-50EF-8896-0CD8400BBBCF"><p>Note that the cleanup
+stack variable name (<codeph>TheTrapCleanup</codeph> in this case) is only
+used to reference the stack when it needs to be destroyed. Therefore the user
+is at liberty to give the stack any valid variable name. Multiple cleanup
+stacks are supported: the system holds a stack of cleanup stacks, of which
+the top item is the current cleanup stack. As such, when a new stack is created
+it is pushed onto the stack of cleanup stacks, making it the current cleanup
+stack. When it is destroyed, it is pushed off the stack of cleanup stacks
+making the previously stacked cleanup stack the current one.</p> </li>
+</ul> </section>
+</conbody></concept>
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