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+++ b/Symbian3/SDK/Source/GUID-D69DD425-5F93-4238-A7E9-915F24A9C9CA.dita Wed Mar 31 11:11:55 2010 +0100
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+<?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-D69DD425-5F93-4238-A7E9-915F24A9C9CA" xml:lang="en"><title>Open
+C MessageQueue Library Example</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The Message Queue Library example demonstrates how to use Open C APIs for
+developing applications that use Open C standard libraries on Symbian platform.
+This example uses the APIs of the message queue library to create/close message
+queues and send/receive messages and also get information on created message
+queues. </p>
+<section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756-GENID-1-8-1-11-1-1-5-1-3-1-11-1-13-1-2-2"><title>Download</title> <p>Click
+on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-9db026cc-ac23-4593-8bbc-4b251c085d4f.zip" scope="external"> opencmessagequeuelibraryex.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-9db026cc-ac23-4593-8bbc-4b251c085d4f.html" scope="peer">browse</xref> to view the example code. </p> </section>
+<section id="GUID-7E7C4564-B10E-41F9-8A9D-D8A6C5E9C51C-GENID-1-8-1-11-1-1-5-1-3-1-11-1-13-1-2-3"><title>Design and
+Implementation</title> <p>The following sections provide information about
+the implementation of the example. </p><p><b>Description</b></p><p>OpenCMessageQueueClientEx
+is a C Application that uses the Message Queue library. This application
+uses main() as the entry point for the application. This is a simple console
+based application. The application uses Message Queue library (OpenCMessageQueueLibrary.dll)
+APIs. The Main thread of the application creates two message queues, and
+two threads. Thread one will send message to message queue 1 and waits for
+messages from message queue 2. Then thread one will send message to message
+queue 2 and waits for messages from message queue 1. If a user tries to create
+a message queue using OpenCMessageQueueLibrary.dll with the already
+existing name, it will just return the existing message queue Id. The application
+has its own icon and can be launched from the UI both in the emulator and
+in the device. </p><p><b>Capabilities</b> </p> The program capabilities are
+defined in: <filepath>MessageQueueLibrary.mmp</filepath> (DLL - library):<codeph> CAPABILITY
+ALL -TCB</codeph> <filepath>MessageQueueClient.mmp</filepath>(EXE - application): <codeph>CAPABILITY
+NONE</codeph>. <p><b>Module hierarchy</b> </p>This application has 2 modules
+as below: <p>Message Queue Library (DLL) that exports set of apis for the
+user.</p><p>OpenCMessageQueueLibraryEx\engine : The application (EXE) that
+demonstrates the usage of Open C APIs and also those APIs exported by Message
+Queue Library.</p><p> (OpenCMessageQueueLibraryEx\exe) : This example will
+create a DLL which exports set of generic APIs with which the user can do
+message queue related operations. To give a rough idea on how to use these
+apis, an EXE is provided that creates threads and does send/receive on message
+queues using those exported apis.</p><p><b>APIs used</b></p><p>msgget </p><p> msgctl
+ </p><p>msgrcv </p><p>msgsnd </p><p>semget </p><p>semctl </p><p> semop </p> </section>
+<section id="GUID-67A72761-1D92-46D1-B1C9-7455978BDE4E-GENID-1-8-1-11-1-1-5-1-3-1-11-1-13-1-2-4"><title>Building and
+Using</title> To build the Message Queue Library example application, go to
+the <filepath>OpenCMessageQueueLibraryEx\group</filepath> directory and build
+the application. The Message Queue Library application consists of two modules,
+which should be built in the following order: engine - which builds the
+generic message queue library exe - which builds an EXE that demonstrates
+the usage of this library The definition for the whole application can be
+found in the<filepath>bld.inf</filepath>in the group subdirectory of the applications
+main directory. </section>
+</conbody></concept>
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