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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_i_p_c_2condvar_2condvarglobal_2src_2adder_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Base/IPC/condvar/condvarglobal/src/adder.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Base/IPC/condvar/condvarglobal/src/adder.cpp</h1><a href="_i_p_c_2condvar_2condvarglobal_2src_2adder_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">// Implements the write operation on a shared memory block.</span>
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<a name="l00015"></a>00015 <span class="comment">//</span>
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<a name="l00016"></a>00016
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018
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<a name="l00022"></a>00022 <span class="preprocessor">#include &quot;<a class="code" href="sharedmem_8h.html">sharedmem.h</a>&quot;</span>
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<a name="l00023"></a>00023 <span class="preprocessor">#include &quot;<a class="code" href="_i_p_c_2condvar_2condvarglobal_2inc_2adder_8h.html">adder.h</a>&quot;</span>
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<a name="l00024"></a>00024
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<a name="l00030"></a><a class="code" href="class_c_adder.html#ac207184f306dec25c5430f2c510f5c3c">00030</a> <a class="code" href="class_c_adder.html">CAdder</a>* <a class="code" href="class_c_adder.html#aa703f5386236c2fa9ad3b750f521200a">CAdder::NewL</a>(CConsoleBase* aConsole)
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<a name="l00031"></a>00031         {
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<a name="l00032"></a>00032         <a class="code" href="class_c_adder.html">CAdder</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_adder.html">CAdder</a>;
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<a name="l00033"></a>00033         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00034"></a>00034         <span class="keyword">self</span>-&gt;ConstructL(aConsole);
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<a name="l00035"></a>00035         CleanupStack::Pop(<span class="keyword">self</span>);
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<a name="l00036"></a>00036         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00037"></a>00037         }
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<a name="l00038"></a>00038
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<a name="l00043"></a><a class="code" href="class_c_adder.html#a258412cf6a78091b2b9f641dadb8e41b">00043</a> <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a258412cf6a78091b2b9f641dadb8e41b">CAdder::RunL</a>()
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<a name="l00044"></a>00044         {
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<a name="l00045"></a>00045         <span class="comment">// Get the key code.</span>
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<a name="l00046"></a>00046         TUint8 option = iConsole-&gt;KeyCode();
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<a name="l00047"></a>00047         <span class="comment">// Print the selected option.</span>
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<a name="l00048"></a>00048         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextFormat,<span class="stringliteral">&quot;%c\n&quot;</span>);
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<a name="l00049"></a>00049         iConsole-&gt;Printf(KTextFormat,option);
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<a name="l00050"></a>00050         <span class="comment">// Stop the timer and the active scheduler.</span>
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<a name="l00051"></a>00051         <a class="code" href="class_c_adder.html#a5d5d56b9ce85c971c2e48b575f792d9d">StopTimer</a>();
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<a name="l00052"></a>00052         CActiveScheduler::Stop();
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<a name="l00053"></a>00053         }
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<a name="l00054"></a>00054
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<a name="l00058"></a><a class="code" href="class_c_adder.html#a73d41c81991e4cf7b65e3644aba926cc">00058</a> <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a73d41c81991e4cf7b65e3644aba926cc">CAdder::DoCancel</a>()
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<a name="l00059"></a>00059         {
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<a name="l00060"></a>00060         <span class="keywordflow">if</span>(IsActive())
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<a name="l00061"></a>00061                 {
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<a name="l00062"></a>00062                 <span class="comment">// Cancel any outstanding read requests.</span>
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<a name="l00063"></a>00063                 iConsole-&gt;ReadCancel();
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<a name="l00064"></a>00064                 }
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<a name="l00065"></a>00065         }
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<a name="l00066"></a>00066
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<a name="l00070"></a>00070 <a class="code" href="class_c_adder.html#a76003b0896145aa8d396f596bb8fbe31">CAdder::~CAdder</a>()
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<a name="l00071"></a>00071         {
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<a name="l00072"></a>00072         <span class="comment">// Cancel all outstanding requests.</span>
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<a name="l00073"></a>00073         <a class="code" href="class_c_adder.html#a73d41c81991e4cf7b65e3644aba926cc">DoCancel</a>();
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075         <span class="comment">// Delete the timer object.</span>
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<a name="l00076"></a>00076         iPeriodic-&gt;Cancel();
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<a name="l00077"></a>00077         <span class="keyword">delete</span> iPeriodic;
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<a name="l00078"></a>00078
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<a name="l00079"></a>00079         <span class="comment">// Close all resource handles.</span>
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<a name="l00080"></a>00080         iChunk.Close();
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<a name="l00081"></a>00081         iMutex.Close();
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<a name="l00082"></a>00082         iCondVar.Close();
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<a name="l00083"></a>00083         }
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<a name="l00084"></a>00084
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<a name="l00088"></a>00088 CAdder::CAdder():CActive(EPriorityUserInput)
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<a name="l00089"></a>00089         {
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<a name="l00090"></a>00090         }
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<a name="l00091"></a>00091
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<a name="l00101"></a>00101 <span class="keywordtype">void</span> CAdder::ConstructL(CConsoleBase* aConsole)
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<a name="l00102"></a>00102         {
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<a name="l00103"></a>00103         <span class="comment">// Create the global condition variable.</span>
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<a name="l00104"></a>00104         User::LeaveIfError(iCondVar.CreateGlobal(KCondVarName));
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<a name="l00105"></a>00105         <span class="comment">// Create the global chunk.</span>
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<a name="l00106"></a>00106         User::LeaveIfError(iChunk.CreateGlobal(KChunkName,<a class="code" href="sharedmem_8h.html#a1006d8c149c84d799a92f7de74ebcf4c">KChunkSize</a>,<a class="code" href="sharedmem_8h.html#a1006d8c149c84d799a92f7de74ebcf4c">KChunkSize</a>));
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<a name="l00107"></a>00107         <span class="comment">// Create the global mutex variable.</span>
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<a name="l00108"></a>00108         User::LeaveIfError(iMutex.CreateGlobal(KMutexName));
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<a name="l00109"></a>00109
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<a name="l00110"></a>00110         <span class="comment">// Create the CPeriodic object.</span>
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<a name="l00111"></a>00111         iPeriodic = <a class="code" href="class_c_adder.html#aa703f5386236c2fa9ad3b750f521200a">CPeriodic::NewL</a>(CActive::EPriorityUserInput);
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<a name="l00112"></a>00112         iConsole = aConsole;
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<a name="l00113"></a>00113
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<a name="l00114"></a>00114         <span class="comment">// Get the address of the chunk.</span>
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<a name="l00115"></a>00115         TUint8 *ptr = iChunk.Base();
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<a name="l00116"></a>00116         <span class="comment">// Initialise the value of the chunk to 0.</span>
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<a name="l00117"></a>00117         *ptr = 0;
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<a name="l00118"></a>00118
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<a name="l00119"></a>00119         <span class="comment">// Add the object to the active scheduler.</span>
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<a name="l00120"></a>00120         <a class="code" href="class_c_adder.html#a1a7d0002967f1aa090a6beb84a433d4c">CActiveScheduler::Add</a>(<span class="keyword">this</span>);
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<a name="l00121"></a>00121         }
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   102
 
<a name="l00122"></a>00122
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<a name="l00126"></a><a class="code" href="class_c_adder.html#a800f42785c37c746dadd65c90b7e0dfa">00126</a> <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a800f42785c37c746dadd65c90b7e0dfa">CAdder::ReadFunction</a>()
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<a name="l00127"></a>00127         {
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   105
 
<a name="l00128"></a>00128         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextMessage,<span class="stringliteral">&quot;Press a key to exit...\n&quot;</span>);
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   106
 
<a name="l00129"></a>00129         iConsole-&gt;Printf(KTextMessage);
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   107
 
<a name="l00130"></a>00130         <span class="comment">// Wait for a key press event.</span>
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   108
 
<a name="l00131"></a>00131         iConsole-&gt;Read(iStatus);
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   109
 
<a name="l00132"></a>00132         SetActive();
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<a name="l00133"></a>00133         }
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   111
 
<a name="l00134"></a>00134
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<a name="l00139"></a><a class="code" href="class_c_adder.html#a004d5ec0fb8626310fdf85843c87ec67">00139</a> <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a004d5ec0fb8626310fdf85843c87ec67">CAdder::StartTimer</a>()
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   113
 
<a name="l00140"></a>00140         {
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   114
 
<a name="l00141"></a>00141         <span class="comment">// Start generating periodic events.</span>
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   115
 
<a name="l00142"></a>00142         iPeriodic-&gt;Start(0,3000000,TCallBack(<a class="code" href="class_c_adder.html#a6e524c7466f89ca4ab9896f5bae13f3e">AddFunction</a>,<span class="keyword">this</span>));
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<a name="l00143"></a>00143         }
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   117
 
<a name="l00144"></a>00144
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   118
 
<a name="l00148"></a><a class="code" href="class_c_adder.html#a5d5d56b9ce85c971c2e48b575f792d9d">00148</a> <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a5d5d56b9ce85c971c2e48b575f792d9d">CAdder::StopTimer</a>()
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   119
 
<a name="l00149"></a>00149         {
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   120
 
<a name="l00150"></a>00150         <span class="comment">// Cancel the  outstanding request.</span>
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   121
 
<a name="l00151"></a>00151         iPeriodic-&gt;Cancel();
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<a name="l00152"></a>00152         }
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   123
 
<a name="l00153"></a>00153
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   124
 
<a name="l00159"></a><a class="code" href="class_c_adder.html#a6e524c7466f89ca4ab9896f5bae13f3e">00159</a> TInt <a class="code" href="class_c_adder.html#a6e524c7466f89ca4ab9896f5bae13f3e">CAdder::AddFunction</a>(TAny* aPtr)
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<a name="l00160"></a>00160         {
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   126
 
<a name="l00161"></a>00161         <a class="code" href="class_c_adder.html">CAdder</a>* ptr = <span class="keyword">static_cast&lt;</span><a class="code" href="class_c_adder.html">CAdder</a>*<span class="keyword">&gt;</span> (aPtr);
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<a name="l00162"></a>00162         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtPanic,<span class="stringliteral">&quot;Pointer is NULL&quot;</span>);
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<a name="l00163"></a>00163         __ASSERT_ALWAYS(ptr,User::Panic(KTxtPanic,-1));
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   129
 
<a name="l00164"></a>00164         <span class="comment">// Invoke the Add() function.</span>
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<a name="l00165"></a>00165         ptr-&gt;<a class="code" href="class_c_adder.html#a1a7d0002967f1aa090a6beb84a433d4c">Add</a>();
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<a name="l00166"></a>00166         <span class="keywordflow">return</span> KErrNone;
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<a name="l00167"></a>00167         }
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   133
 
<a name="l00168"></a>00168
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   134
 
<a name="l00172"></a>00172 <span class="keywordtype">void</span> <a class="code" href="class_c_adder.html#a1a7d0002967f1aa090a6beb84a433d4c">CAdder::Add</a>()
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   135
 
<a name="l00173"></a>00173         {
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   136
 
<a name="l00174"></a>00174         <span class="comment">// Acquire the mutex.</span>
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   137
 
<a name="l00175"></a>00175         iMutex.Wait();
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<a name="l00176"></a>00176
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   139
 
<a name="l00177"></a>00177         <span class="comment">// Get a random number.</span>
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<a name="l00178"></a>00178         TInt randVal = Math::Random() % 10;
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   141
 
<a name="l00179"></a>00179
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   142
 
<a name="l00180"></a>00180         <span class="comment">// Get the address of the chunk.</span>
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<a name="l00181"></a>00181         TUint8 *ptr = iChunk.Base();
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<a name="l00182"></a>00182
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   145
 
<a name="l00183"></a>00183         <span class="comment">// Print the value of the chunk before addition.</span>
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   146
 
<a name="l00184"></a>00184         iConsole-&gt;Printf(_L(<span class="stringliteral">&quot;Value read from the shared memory: %d\n&quot;</span>),*ptr);
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<a name="l00185"></a>00185
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   148
 
<a name="l00186"></a>00186         <span class="comment">// Add the random value to the shared memory variable.</span>
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   149
 
<a name="l00187"></a>00187         *ptr += randVal;
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<a name="l00188"></a>00188
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   151
 
<a name="l00189"></a>00189         <span class="keywordflow">while</span>(*ptr &gt; <a class="code" href="sharedmem_8h.html#a0f2ae9d486d80c446844be5480b7bbc2">KUpperThreshold</a>)
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<a name="l00190"></a>00190                 {
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<a name="l00191"></a>00191                 <span class="comment">// Wait on the condition variable if the result is greater than 100.</span>
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<a name="l00192"></a>00192                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KBlockMessage,<span class="stringliteral">&quot;Adder blocked by condVar until Subtractor signals that value has been decreased.\nIntermediate value of the chunk = %d\n&quot;</span>);
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   155
 
<a name="l00193"></a>00193                 iConsole-&gt;Printf(KBlockMessage,*ptr);
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   156
 
<a name="l00194"></a>00194                 iCondVar.Wait(iMutex);
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<a name="l00195"></a>00195                 }
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<a name="l00196"></a>00196         <span class="comment">// Print the updated value of the chunk.</span>
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   159
 
<a name="l00197"></a>00197         iConsole-&gt;Printf(_L(<span class="stringliteral">&quot;Value of the shared memory increased to : %d\n&quot;</span>),*ptr);
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<a name="l00198"></a>00198
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   161
 
<a name="l00199"></a>00199         <span class="comment">// Signal the mutex and the condition variable.</span>
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   162
 
<a name="l00200"></a>00200         <span class="keywordflow">if</span>(*ptr &gt; <a class="code" href="sharedmem_8h.html#a817ce7a9d8ca9ead92509953f8dcdcad">KLowerThreshold</a>)
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   163
 
<a name="l00201"></a>00201                 {
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   164
 
<a name="l00202"></a>00202                 <span class="comment">// Signal that the level is safe for subtraction to (re)start.</span>
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   165
 
<a name="l00203"></a>00203                 iCondVar.Signal();
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<a name="l00204"></a>00204                 }
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<a name="l00205"></a>00205         iMutex.Signal();
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<a name="l00206"></a>00206         }
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<a name="l00207"></a>00207
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<a name="l00208"></a>00208 LOCAL_D CConsoleBase* console;
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<a name="l00209"></a>00209 LOCAL_C <span class="keywordtype">void</span> DoExampleL();
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<a name="l00210"></a>00210 LOCAL_C <span class="keywordtype">void</span> callExampleL();
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<a name="l00211"></a>00211
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<a name="l00212"></a>00212 LOCAL_C <span class="keywordtype">void</span> DoExampleL()
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<a name="l00213"></a>00213         {
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<a name="l00214"></a>00214         <span class="comment">// Create and install the active scheduler.</span>
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<a name="l00215"></a>00215         CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler();
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<a name="l00216"></a>00216         CleanupStack::PushL(scheduler);
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<a name="l00217"></a>00217         CActiveScheduler::Install(scheduler);
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<a name="l00218"></a>00218
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<a name="l00219"></a>00219         <span class="comment">// Create the CAdder object.</span>
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<a name="l00220"></a>00220         <a class="code" href="class_c_adder.html">CAdder</a>* adder = <a class="code" href="class_c_adder.html#aa703f5386236c2fa9ad3b750f521200a">CAdder::NewL</a>(console);
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<a name="l00221"></a>00221         CleanupStack::PushL(adder);
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   184
 
<a name="l00222"></a>00222
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<a name="l00223"></a>00223         <span class="comment">// Start the timer of the CAdder object.</span>
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   186
 
<a name="l00224"></a>00224         adder-&gt;<a class="code" href="class_c_adder.html#a004d5ec0fb8626310fdf85843c87ec67">StartTimer</a>();
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<a name="l00225"></a>00225         <span class="comment">// Issue an asynchronous read request.</span>
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<a name="l00226"></a>00226         adder-&gt;<a class="code" href="class_c_adder.html#a800f42785c37c746dadd65c90b7e0dfa">ReadFunction</a>();
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<a name="l00227"></a>00227         <span class="comment">// Start the active scheduler.</span>
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<a name="l00228"></a>00228         CActiveScheduler::Start();
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<a name="l00229"></a>00229
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<a name="l00230"></a>00230         CleanupStack::PopAndDestroy(2,scheduler);
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<a name="l00231"></a>00231         }
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<a name="l00232"></a>00232
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<a name="l00233"></a><a class="code" href="_i_p_c_2condvar_2condvarglobal_2src_2adder_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00233</a> GLDEF_C TInt E32Main() <span class="comment">// main function called by E32</span>
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<a name="l00234"></a>00234     {
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<a name="l00235"></a>00235         __UHEAP_MARK;
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<a name="l00236"></a>00236         CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span>
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<a name="l00237"></a>00237         TRAPD(error,callExampleL()); <span class="comment">// more initializations, then do example</span>
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<a name="l00238"></a>00238         <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span>
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<a name="l00239"></a>00239         __ASSERT_ALWAYS(!error,User::Panic(KTxtEPOC32EX,error));
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<a name="l00240"></a>00240         __UHEAP_MARKEND;
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<a name="l00241"></a>00241         <span class="keywordflow">return</span> 0; <span class="comment">// and return</span>
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<a name="l00242"></a>00242     }
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<a name="l00243"></a>00243
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<a name="l00244"></a>00244 LOCAL_C <span class="keywordtype">void</span> callExampleL() <span class="comment">// initialise and call example code under cleanup stack</span>
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<a name="l00245"></a>00245     {
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<a name="l00246"></a>00246         console=Console::NewL(KTxtExampleCode,TSize(KConsFullScreen,KConsFullScreen));
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<a name="l00247"></a>00247         CleanupStack::PushL(console);
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<a name="l00248"></a>00248         TRAPD(error,DoExampleL()); <span class="comment">// perform example function</span>
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<a name="l00249"></a>00249         <span class="keywordflow">if</span> (error)
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<a name="l00250"></a>00250                 console-&gt;Printf(KFormatFailed, error);
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<a name="l00251"></a>00251         <span class="keywordflow">else</span>
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<a name="l00252"></a>00252                 console-&gt;Printf(KTxtOK);
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<a name="l00253"></a>00253         console-&gt;Printf(KTxtPressAnyKey);
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<a name="l00254"></a>00254         console-&gt;Getch(); <span class="comment">// get and ignore character</span>
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<a name="l00255"></a>00255         CleanupStack::PopAndDestroy(); <span class="comment">// close console</span>
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<a name="l00256"></a>00256     }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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