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Symbian3/SDK/Source/GUID-C7B748CF-D080-5448-98AF-1634D821E713.dita
changeset 0 89d6a7a84779 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-C7B748CF-D080-5448-98AF-1634D821E713.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,57 @@
+<?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-C7B748CF-D080-5448-98AF-1634D821E713" xml:lang="en"><title> SMP
+Example</title><shortdesc>This example demonstrates symmetric multiprocessing using multiple
+threads. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>This example shows the differences between code running in a unicore environment
+and in a multiprocessor environment.</p>
+<section id="GUID-7AC2BE12-4F01-4140-8379-672475DE7681"><title>Download</title> <p>Click on the following link to download
+the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-577596d8-76a2-4a41-aa0f-deefe5638e23.zip" scope="external">SmpExample.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-577596d8-76a2-4a41-aa0f-deefe5638e23.html" scope="peer">browse</xref> to view the example code. </p> </section>
+<section id="GUID-7A70847E-40A2-4267-9BD4-36F88F48C84A"><title>Class summary</title><ul>
+<li><p><xref href="GUID-B0E661BC-4058-3256-B9C3-5A4FD52F6DE5.dita"><apiname>RThread</apiname></xref> - A handle to a thread.</p></li>
+<li><p><xref href="GUID-F4A68645-2265-307F-B951-8295827E000B.dita"><apiname>RDbStoreDatabase</apiname></xref> - DBMS Store database implementation</p></li>
+</ul></section>
+<section id="GUID-BE13F08D-09FD-41DF-9210-D46EBECADA69"><title>Design and implementation</title> <p>The example creates two
+databases named DBforSMP1.db and DBforSMP2.db and three threads: </p> <ul>
+<li id="GUID-F4EE1C84-FE30-5C99-872B-1881D852CAEA"><p> <codeph>WriterThread1</codeph>:
+It creates the DBforSMP1.db database and writes integers to it. The thread
+has the lowest priority amongst all the threads. </p> </li>
+<li id="GUID-7B2D0419-E069-59FA-A6CE-70EBC203F656"><p> <codeph>WriterThread2</codeph>:
+It creates the DBforSMP2.db database and writes some integers to it. The thread
+has highest priority amongst all the threads. </p> </li>
+<li id="GUID-7C9584F2-E6C8-5A02-B4C2-4845CF4BAA36"><p> <codeph>ReaderThread</codeph>:
+It reads the two databases and prints the output to the console. It has normal
+priority. </p> </li>
+</ul> <p>In a unicore enviroment, the threads are executed according to their
+priorities. This means first <codeph> WriterThread2</codeph>, then <codeph>ReaderThread</codeph> and
+finally <codeph>WriterThread1</codeph> is executed. Hence <codeph>ReaderThead</codeph> can
+only print the contents of the DBforSMP2.db in the console because DBforSMP1
+is empty. in an SMP environment, threads run simultaneously and <codeph>ReaderThread</codeph> can
+print the contents of both the databases. </p> </section>
+<section id="GUID-3686F166-C4DD-4269-9B9C-F0027F53547E"><title>Building and configuring</title> <p>To build the example: </p> <ul>
+<li id="GUID-037442C7-2436-5152-9A3E-9DC0B4283A9C-GENID-1-6-1-13-1-1-4-1-4-1-25-1-30-1-3-5-3-1"><p>The example builds an
+executable called <filepath>smpexample.exe</filepath> in the standard location. </p> </li>
+<li id="GUID-B7C849B9-0885-5253-A78B-71854F86D772-GENID-1-6-1-13-1-1-4-1-4-1-25-1-30-1-3-5-3-2"><p>You can build the example
+from your IDE or the command line. </p> <p>If you use an IDE, import the <filepath>bld.inf</filepath> file
+of the example into your IDE, and use the build command of the IDE. </p> <p>If
+you use the command line, open a command prompt, and set the current directory
+to the source code directory of the example. You can then build the example
+with the SBSv1 build tools with the following commands: </p> <p><userinput>bldmake
+bldfiles</userinput> </p> <p><userinput>abld build</userinput> </p> <p><xref href="GUID-793A5EF9-CC16-5EEB-9011-6431EA76EB15.dita">How to use bldmake</xref> and <xref href="GUID-B6B54E07-3B34-5D5C-8815-93383FA8FB4B.dita">How to use abld</xref> describe
+how to use the SBSv1 build tools. </p> </li>
+</ul> </section>
+<section id="GUID-F773B722-7612-4BAF-99CB-84E39CE10C40"><title>Running the example</title> <p>To test the example in an SMP
+environment, add <codeph>crazyscheduling on</codeph>in the <filepath>epoc32\data\epoc.ini</filepath> file.
+This emulates SMP behaviour in the techview emulator. Execute the example
+in both unicore and multiprocessor environment and see the difference. Run
+the example following the instructions provided in the console. </p> </section>
+</conbody></concept>
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MCL/sftools/depl/docscontent