author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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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-056B9A65-EC59-4B2E-9F10-E487343B5F5F" xml:lang="en"><title>SemaphoreExample: |
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thread synchronisation using semaphores</title><shortdesc>Explains how to use Semaphores to achieve thread synchronization.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>It is recommended to use semaphores instead of thread priorities for the |
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following reasons:<ul> |
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<li><p> In a uniprocessor environment, setting the thread priorities does |
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not guarantee prioritized or serialized execution.</p></li> |
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<li><p>In a multiprocessor or SMP environment, thread priorities are irrelevant |
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as multiple threads can run simultaneously.</p></li> |
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</ul></p> |
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<section id="GUID-48668C9B-6B42-4FE8-899B-403D5EB5FB53"><title>Download</title> <p>Click on the following link to download |
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the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-34775913-c5c2-41ba-a591-827039bbe7af.zip" scope="external">SemaphoreExample.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-34775913-c5c2-41ba-a591-827039bbe7af.html" scope="peer">browse</xref> to view the example code. </p></section> |
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<section id="GUID-2E531F3D-EEC8-40FD-9F32-2071FDECAE61"><title>Description: </title><p> The example creates a database containing |
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a table of three columns with integer entries.</p><p> The example creates |
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two threads:</p><ul> |
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<li><p><codeph>WriterThread</codeph>: This thread calls a periodic function |
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at an interval of one second, and in each iteration it inserts one row of |
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integers in the table. </p></li> |
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<li><p><codeph>ReaderThread</codeph>: This thread also calls a periodic function |
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at an interval of one second, and in each iteration it reads one row of integers |
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following the last row read.</p></li> |
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</ul><p> The example uses a macro <codeph>USE_SEMAPHORE</codeph> to show the |
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difference between the code using semaphores and the code which doesn't use |
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semaphores. When not using semaphores, it is not guaranteed that the <codeph>ReaderThread</codeph> will |
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be able to read the database because in an SMP environment, data may not yet |
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have been written by the <codeph>WriterThread</codeph>.</p><p>Using a semaphore |
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serializes the thread execution. The read operation waits on the semaphore |
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until it gets a signal from the write operation. This ensures that the <codeph>ReaderThread</codeph> only |
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reads a row from the database after the <codeph>WriterThread</codeph> has |
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written it. </p></section> |
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<section id="GUID-07CAD3CA-86DB-4245-8565-C618E59718A5"><title>Class summary</title><ul> |
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<li><p><xref href="GUID-B0E661BC-4058-3256-B9C3-5A4FD52F6DE5.dita"><apiname>RThread</apiname></xref> - A handle to a thread.</p></li> |
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<li><p><xref href="GUID-F4A68645-2265-307F-B951-8295827E000B.dita"><apiname>RDbStoreDatabase</apiname></xref> - DBMS Store database implementation</p></li> |
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<li><p><xref href="GUID-AED27A76-3645-3A04-B80D-10473D9C5A27.dita"><apiname>RSemaphore</apiname></xref> - Used for thread synchronization. </p></li> |
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</ul></section> |
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<section id="GUID-863B0EDF-F3F8-4345-9FEE-824350A2DBCE"><title>Building and configuring</title> <p>To build the example: </p> <ul> |
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<li id="GUID-037442C7-2436-5152-9A3E-9DC0B4283A9C-GENID-1-6-1-13-1-1-4-1-4-1-25-1-31-1-3-5-3-1"><p>The example builds an |
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executable called <filepath>semaphoreexample.exe</filepath> in the standard |
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location. </p> </li> |
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<li id="GUID-B7C849B9-0885-5253-A78B-71854F86D772-GENID-1-6-1-13-1-1-4-1-4-1-25-1-31-1-3-5-3-2"><p>You can build the example |
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from your IDE or the command line. </p> <p>If you use an IDE, import the <filepath>bld.inf</filepath> file |
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of the example into your IDE, and use the build command of the IDE. </p> <p>If |
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you use the command line, open a command prompt, and set the current directory |
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to the source code directory of the example. You can then build the example |
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with the SBSv1 build tools with the following commands: </p> <p><userinput>bldmake |
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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 |
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how to use the SBSv1 build tools. </p> </li> |
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</ul> </section> |
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<section id="GUID-278DD8CF-28AF-4826-B938-20EC19F3A5B0"><title>Running the example</title> <p>The example code contains a |
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macro<codeph>USE_SEMAPHORE</codeph> in the <filepath>mmp</filepath> file. |
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By default it is commented out and on execution the example runs without using |
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semaphores; the macro should be uncommented to use semaphores. The console |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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output will generally look the same whether using semaphores or not if there |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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64 |
is a single processor, but differences will occur in an SMP environment. Run |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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65 |
the example following the instructions provided in the console. </p> </section> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</conbody></concept> |