--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B.dita	Wed Mar 31 11:11:55 2010 +0100
@@ -0,0 +1,51 @@
+<?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-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B" xml:lang="en"><title>Using
+Signals to Handle Asynchronous Events</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>You can use signals to handle asynchronous user events. A process (program
+code) can send a signal to itself that can be handled asynchronously based
+on the signal handler registered for it. This provides a way to perform tasks
+in parallel without any complex thread manipulation in the program code. </p>
+<p>The following example code demonstrates how a program code sets a signal
+to itself and how it handles the signal asynchronously in a signal handler: </p>
+<codeblock id="GUID-4424321B-112A-5556-AD29-41F613A60C84" xml:space="preserve">#include &lt;signal.h&gt;
+#include &lt;stdio.h&gt;
+void sighandler(int signum)
+    {
+    if(signum == SIGUSR1)
+        {
+        // Code to perform custom handling
+        }
+    else if(signum == SIGUSR2)
+        {
+        // Code to perform custom handling
+        }
+    }
+int main()
+    {
+    signal(SIGUSR1,sighandler);
+    signal(SIGUSR2,sighandler);
+    // program logic
+    raise(SIGUSR1); // indicates user event one
+    // program logic
+    raise(SIGUSR2); // indicates user event two
+    // program logic
+    return 0;
+    }</codeblock>
+</conbody><related-links>
+<link href="GUID-66C1493D-5B85-558A-9A39-454E6EBA307B.dita"><linktext>Signal Emulation
+on the Symbian Platform</linktext></link>
+<link href="GUID-186B9876-2A08-5F23-BB49-49EC34C51507.dita"><linktext>Using Signals
+to Terminate Processes</linktext></link>
+<link href="GUID-E65D91AE-482F-5592-B83C-0F29126C2EFA.dita"><linktext>Using Signals
+to Handle Exceptions</linktext></link>
+</related-links></concept>
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