author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Wed, 31 Mar 2010 11:11:55 +0100 | |
changeset 7 | 51a74ef9ed63 |
child 8 | ae94777fff8f |
permissions | -rw-r--r-- |
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Week 12 contribution of API Specs and fix SDK submission
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-092C18D4-A525-5562-9BF6-41435E400290" xml:lang="en"><title>LibpThread |
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Example - Using P.I.P.S OECORE </title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>This example application shows, using a P.I.P.S. (P.I.P.S. Is POSIX on |
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the Symbian platform) program, the use of the LibpThread library to demonstrate |
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simple multi-threading and synchronisation. </p> |
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<p>The purpose is to create a basic multithreading example showing the usage |
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of the LibpThread APIs. This example also shows how multi-threading is used |
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to achieve concurrency in tasks and sharing of resources. </p> |
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<section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756-GENID-1-8-1-11-1-1-5-1-3-1-11-1-7-1-2-3"><title>Download</title> <p>Click |
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on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-84e8baf2-57f1-4255-aeb8-a6ed0ed2145e.zip" scope="external"> LibpThreadExample.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-84e8baf2-57f1-4255-aeb8-a6ed0ed2145e.html" scope="peer">browse</xref> to view the example code. </p> </section> |
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<section id="GUID-7E7C4564-B10E-41F9-8A9D-D8A6C5E9C51C-GENID-1-8-1-11-1-1-5-1-3-1-11-1-7-1-2-4"><title>Description</title> <p>The |
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following sections provide more information about the steps that the example |
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performs. </p> <p><b> Thread Synchronisation</b> </p> <p>The example creates |
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three threads named ThreadOne, ThreadTwo and ThreadThree. The threads write |
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"One", "Two" and "Three" five times in a text file. The text file, located |
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in <filepath>epoc32\winscw\c\newfile.txt</filepath>, is used as a shared resource |
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for all three threads. A mutex is used to ensure that first ThreadOne writes |
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in the file, then ThreadTwo and then ThreadThree. If the mutex is not used |
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all the threads can simultaneously write in the file. This can be seen by |
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commenting out <codeph>pthread_mutex_lock</codeph> and <codeph>pthread_mutex_unlock</codeph> in |
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the code. </p> </section> |
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<section id="GUID-236CB272-E196-4A61-B627-ACFFC4B37AA1"><title>Related APIs</title><p><xref href="GUID-736D5209-CD86-324C-BAB0-7B15C3D1862D.dita"><apiname>pthread_mutex_lock</apiname></xref> </p><p><xref href="GUID-9D7CD10C-F958-3792-8888-B7F39B148302.dita"><apiname>pthread_mutex_unlock</apiname></xref> </p><p><xref href="GUID-3A89E849-DD7F-3381-9469-6CD89892E616.dita"><apiname>pthread_join</apiname></xref></p><p><xref href="GUID-889CB456-6980-3B92-9350-0C6C8C9AC435.dita"><apiname>pthread_mutex_t</apiname></xref></p></section> |
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<section id="GUID-67A72761-1D92-46D1-B1C9-7455978BDE4E-GENID-1-8-1-11-1-1-5-1-3-1-11-1-7-1-2-6"><title>Build</title> <p>The <xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">Symbian build |
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process</xref> describes how to build this example application. </p> <p>The |
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example builds an executable called <filepath>LibpThreadExample.exe</filepath> in |
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the standard locations. </p> <p>To run the example, start <filepath>LibpThreadExample.exe</filepath> from |
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the file system or from your IDE. After launching the executable, depending |
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on the emulator you are using, you may need to navigate away from the application |
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launcher or shell screen to view the console. </p> </section> |
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</conbody></concept> |