--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,36 @@
+<?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 xml:lang="en" id="GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B"><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 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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