--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-088DC096-0CC7-5510-8D71-7DAF5961A681.dita	Wed Mar 31 11:11:55 2010 +0100
@@ -0,0 +1,30 @@
+<?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-088DC096-0CC7-5510-8D71-7DAF5961A681" xml:lang="en"><title>Using
+Critical Sections</title><shortdesc>This document describes how to use critical sections.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>Critical sections are provided to serialise access to shared resources.
+They are Kernel objects and, as such, are managed by the Kernel.</p>
+<p>A critical section can only be used by threads within the same process;
+it <i>cannot</i> be used to control access to a resource shared by threads
+across different processes. To serialise access to a resource shared by threads
+across more than one process, use a mutex.</p>
+<p>While a critical section is used to serialise access to a general resource,
+it is used, typically, to serialise access to a section of re-entrant code
+which cannot be executed concurrently by more than one thread within a process.
+A critical section only allows one thread into a controlled section, forcing
+other threads, that try to gain access to that critical section, to wait until
+the first thread has exited from that section.</p>
+<p>Note that threads which do not attempt to gain access to the critical section
+are not blocked.</p>
+<p>A critical section is implemented using a semaphore.</p>
+<p>Access to a critical section object is through an <codeph>RCriticalSection</codeph> handle.</p>
+</conbody></concept>
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