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11 <h1>examples/Base/IPC/condvar/condvarglobal/src/subtractor.cpp</h1><a href="subtractor_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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12 <a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span> |
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13 <a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span> |
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14 <a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span> |
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15 <a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span> |
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16 <a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span> |
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17 <a name="l00007"></a>00007 <span class="comment">//</span> |
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18 <a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span> |
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19 <a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span> |
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20 <a name="l00010"></a>00010 <span class="comment">//</span> |
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21 <a name="l00011"></a>00011 <span class="comment">// Contributors:</span> |
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22 <a name="l00012"></a>00012 <span class="comment">//</span> |
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23 <a name="l00013"></a>00013 <span class="comment">// Description:</span> |
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24 <a name="l00014"></a>00014 <span class="comment">// Implements the write operation on a shared memory block.</span> |
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25 <a name="l00015"></a>00015 <span class="comment">//</span> |
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26 <a name="l00016"></a>00016 |
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27 <a name="l00017"></a>00017 |
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28 <a name="l00018"></a>00018 |
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29 <a name="l00022"></a>00022 <span class="preprocessor">#include "<a class="code" href="sharedmem_8h.html">sharedmem.h</a>"</span> |
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30 <a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="subtractor_8h.html">subtractor.h</a>"</span> |
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31 <a name="l00024"></a>00024 |
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32 <a name="l00030"></a><a class="code" href="class_c_subtractor.html#a7d6002b0b8610a3241853c7fb4ef3995">00030</a> <a class="code" href="class_c_subtractor.html">CSubtractor</a>* <a class="code" href="class_c_subtractor.html#a7d6002b0b8610a3241853c7fb4ef3995">CSubtractor::NewL</a>(CConsoleBase* aConsole) |
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33 <a name="l00031"></a>00031 { |
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34 <a name="l00032"></a>00032 <a class="code" href="class_c_subtractor.html">CSubtractor</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_subtractor.html">CSubtractor</a>; |
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35 <a name="l00033"></a>00033 CleanupStack::PushL(<span class="keyword">self</span>); |
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36 <a name="l00034"></a>00034 <span class="keyword">self</span>->ConstructL(aConsole); |
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37 <a name="l00035"></a>00035 CleanupStack::Pop(<span class="keyword">self</span>); |
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38 <a name="l00036"></a>00036 <span class="keywordflow">return</span> <span class="keyword">self</span>; |
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39 <a name="l00037"></a>00037 } |
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40 <a name="l00038"></a>00038 |
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41 <a name="l00043"></a><a class="code" href="class_c_subtractor.html#adafc90c62c12777fc2c1670cfc65ff7e">00043</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#adafc90c62c12777fc2c1670cfc65ff7e">CSubtractor::RunL</a>() |
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42 <a name="l00044"></a>00044 { |
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43 <a name="l00045"></a>00045 <span class="comment">// Get the key code.</span> |
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44 <a name="l00046"></a>00046 TUint8 option = iConsole->KeyCode(); |
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45 <a name="l00047"></a>00047 <span class="comment">// Print the selected option.</span> |
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46 <a name="l00048"></a>00048 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextFormat,<span class="stringliteral">"%c\n"</span>); |
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47 <a name="l00049"></a>00049 iConsole->Printf(KTextFormat,option); |
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48 <a name="l00050"></a>00050 <span class="comment">// Stop the timer and the active scheduler.</span> |
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49 <a name="l00051"></a>00051 <a class="code" href="class_c_subtractor.html#a6fccf6a6e4f1b731f1d2105ccac84484">StopTimer</a>(); |
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50 <a name="l00052"></a>00052 CActiveScheduler::Stop(); |
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51 <a name="l00053"></a>00053 } |
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52 <a name="l00054"></a>00054 |
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53 <a name="l00058"></a><a class="code" href="class_c_subtractor.html#a8fe681f7232eb2d9a8e5d6b00d56d461">00058</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#a8fe681f7232eb2d9a8e5d6b00d56d461">CSubtractor::DoCancel</a>() |
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54 <a name="l00059"></a>00059 { |
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55 <a name="l00060"></a>00060 <span class="keywordflow">if</span>(IsActive()) |
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56 <a name="l00061"></a>00061 { |
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57 <a name="l00062"></a>00062 <span class="comment">// Cancel any outstanding read requests.</span> |
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58 <a name="l00063"></a>00063 iConsole->ReadCancel(); |
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59 <a name="l00064"></a>00064 } |
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60 <a name="l00065"></a>00065 } |
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61 <a name="l00066"></a>00066 |
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62 <a name="l00070"></a><a class="code" href="class_c_subtractor.html#a6641d546e8cf49ad7295cf4045d6c901">00070</a> <a class="code" href="class_c_subtractor.html#a6641d546e8cf49ad7295cf4045d6c901">CSubtractor::~CSubtractor</a>() |
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63 <a name="l00071"></a>00071 { |
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64 <a name="l00072"></a>00072 <span class="comment">// Cancel all outstanding requests.</span> |
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65 <a name="l00073"></a>00073 <a class="code" href="class_c_subtractor.html#a8fe681f7232eb2d9a8e5d6b00d56d461">DoCancel</a>(); |
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66 <a name="l00074"></a>00074 <span class="comment">// Delete the timer object.</span> |
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67 <a name="l00075"></a>00075 iPeriodic->Cancel(); |
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68 <a name="l00076"></a>00076 <span class="keyword">delete</span> iPeriodic; |
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69 <a name="l00077"></a>00077 } |
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70 <a name="l00078"></a>00078 |
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71 <a name="l00082"></a>00082 CSubtractor::CSubtractor():CActive(EPriorityUserInput) |
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72 <a name="l00083"></a>00083 { |
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73 <a name="l00084"></a>00084 } |
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74 <a name="l00085"></a>00085 |
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75 <a name="l00091"></a>00091 <span class="keywordtype">void</span> CSubtractor::ConstructL(CConsoleBase* aConsole) |
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76 <a name="l00092"></a>00092 { |
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77 <a name="l00093"></a>00093 <span class="comment">// Open the global condition variable.</span> |
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78 <a name="l00094"></a>00094 User::LeaveIfError(iCondVar.OpenGlobal(KCondVarName)); |
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79 <a name="l00095"></a>00095 <span class="comment">// Open the global chunk variable.</span> |
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80 <a name="l00096"></a>00096 User::LeaveIfError(iChunk.OpenGlobal(KChunkName,EFalse)); |
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81 <a name="l00097"></a>00097 <span class="comment">// Open the global mutex variable.</span> |
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82 <a name="l00098"></a>00098 User::LeaveIfError(iMutex.OpenGlobal(KMutexName)); |
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83 <a name="l00099"></a>00099 |
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84 <a name="l00100"></a>00100 <span class="comment">// Create the CPeriodic object.</span> |
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85 <a name="l00101"></a>00101 iPeriodic = <a class="code" href="class_c_subtractor.html#a7d6002b0b8610a3241853c7fb4ef3995">CPeriodic::NewL</a>(CActive::EPriorityUserInput); |
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86 <a name="l00102"></a>00102 iConsole = aConsole; |
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87 <a name="l00103"></a>00103 |
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88 <a name="l00104"></a>00104 <span class="comment">// Add the object to the active scheduler.</span> |
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89 <a name="l00105"></a>00105 CActiveScheduler::Add(<span class="keyword">this</span>); |
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90 <a name="l00106"></a>00106 } |
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91 <a name="l00107"></a>00107 |
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92 <a name="l00111"></a><a class="code" href="class_c_subtractor.html#a0d39bfb8170e1923541fa6efd915d206">00111</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#a0d39bfb8170e1923541fa6efd915d206">CSubtractor::ReadFunction</a>() |
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93 <a name="l00112"></a>00112 { |
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94 <a name="l00113"></a>00113 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextMessage,<span class="stringliteral">"Press a key to exit...\n"</span>); |
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95 <a name="l00114"></a>00114 iConsole->Printf(KTextMessage); |
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96 <a name="l00115"></a>00115 <span class="comment">// Wait for a key press event.</span> |
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97 <a name="l00116"></a>00116 iConsole->Read(iStatus); |
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98 <a name="l00117"></a>00117 SetActive(); |
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99 <a name="l00118"></a>00118 } |
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100 <a name="l00119"></a>00119 |
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101 <a name="l00124"></a><a class="code" href="class_c_subtractor.html#ab5a9d2c973fb9387a6519971ddcb61c2">00124</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#ab5a9d2c973fb9387a6519971ddcb61c2">CSubtractor::StartTimer</a>() |
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102 <a name="l00125"></a>00125 { |
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103 <a name="l00126"></a>00126 iPeriodic->Start(0,3000000,TCallBack(<a class="code" href="class_c_subtractor.html#a44265608e41e7a13f8790fcd68a5589d">SubtractFunction</a>,<span class="keyword">this</span>)); |
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104 <a name="l00127"></a>00127 } |
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105 <a name="l00128"></a>00128 |
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106 <a name="l00132"></a><a class="code" href="class_c_subtractor.html#a6fccf6a6e4f1b731f1d2105ccac84484">00132</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#a6fccf6a6e4f1b731f1d2105ccac84484">CSubtractor::StopTimer</a>() |
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107 <a name="l00133"></a>00133 { |
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108 <a name="l00134"></a>00134 <span class="comment">// Cancel the outstanding request.</span> |
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109 <a name="l00135"></a>00135 iPeriodic->Cancel(); |
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110 <a name="l00136"></a>00136 } |
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111 <a name="l00137"></a>00137 |
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112 <a name="l00143"></a><a class="code" href="class_c_subtractor.html#a44265608e41e7a13f8790fcd68a5589d">00143</a> TInt <a class="code" href="class_c_subtractor.html#a44265608e41e7a13f8790fcd68a5589d">CSubtractor::SubtractFunction</a>(TAny* aPtr) |
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113 <a name="l00144"></a>00144 { |
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114 <a name="l00145"></a>00145 <a class="code" href="class_c_subtractor.html">CSubtractor</a>* ptr = <span class="keyword">static_cast<</span><a class="code" href="class_c_subtractor.html">CSubtractor</a>*<span class="keyword">></span> (aPtr); |
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115 <a name="l00146"></a>00146 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtPanic,<span class="stringliteral">"Unexpected datatype\n"</span>); |
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116 <a name="l00147"></a>00147 __ASSERT_ALWAYS(ptr,User::Panic(KTxtPanic,-1)); |
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117 <a name="l00148"></a>00148 <span class="comment">// Invoke the Subtract() function.</span> |
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118 <a name="l00149"></a>00149 ptr-><a class="code" href="class_c_subtractor.html#aaea4ddea47a64945f5dcd280d9f5adcb">Subtract</a>(); |
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119 <a name="l00150"></a>00150 <span class="keywordflow">return</span> KErrNone; |
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120 <a name="l00151"></a>00151 } |
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121 <a name="l00152"></a>00152 |
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122 <a name="l00156"></a><a class="code" href="class_c_subtractor.html#aaea4ddea47a64945f5dcd280d9f5adcb">00156</a> <span class="keywordtype">void</span> <a class="code" href="class_c_subtractor.html#aaea4ddea47a64945f5dcd280d9f5adcb">CSubtractor::Subtract</a>() |
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123 <a name="l00157"></a>00157 { |
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124 <a name="l00158"></a>00158 <span class="comment">// Acquire the mutex.</span> |
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125 <a name="l00159"></a>00159 iMutex.Wait(); |
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126 <a name="l00160"></a>00160 |
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127 <a name="l00161"></a>00161 <span class="comment">// Get a random number.</span> |
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128 <a name="l00162"></a>00162 TInt randVal = Math::Random() % 10; |
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129 <a name="l00163"></a>00163 |
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130 <a name="l00164"></a>00164 <span class="comment">// Get the address of the chunk.</span> |
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131 <a name="l00165"></a>00165 TUint8 *ptr = iChunk.Base(); |
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132 <a name="l00166"></a>00166 |
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133 <a name="l00167"></a>00167 <span class="comment">// Print the value of the chunk before subtraction.</span> |
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134 <a name="l00168"></a>00168 iConsole->Printf(_L(<span class="stringliteral">"Value read from the shared memory: %d\n"</span>),*ptr); |
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135 <a name="l00169"></a>00169 |
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136 <a name="l00170"></a>00170 <span class="comment">// Subtract the random value from the shared memory variable.</span> |
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137 <a name="l00171"></a>00171 *ptr -= randVal; |
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138 <a name="l00172"></a>00172 |
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139 <a name="l00173"></a>00173 <span class="keywordflow">while</span>(*ptr < <a class="code" href="sharedmem_8h.html#a817ce7a9d8ca9ead92509953f8dcdcad">KLowerThreshold</a>) |
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140 <a name="l00174"></a>00174 { |
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141 <a name="l00175"></a>00175 <span class="comment">// Wait on the condition variable if the result is lesser than 0.</span> |
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142 <a name="l00176"></a>00176 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KBlockMessage,<span class="stringliteral">"Subtractor blocked by condVar until Adder signals that value has been increased.\nIntermediate value of the chunk = %d\n"</span>); |
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143 <a name="l00177"></a>00177 iConsole->Printf(KBlockMessage,*ptr); |
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144 <a name="l00178"></a>00178 iCondVar.Wait(iMutex); |
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145 <a name="l00179"></a>00179 } |
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146 <a name="l00180"></a>00180 <span class="comment">// Print the updated value of the chunk.</span> |
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147 <a name="l00181"></a>00181 iConsole->Printf(_L(<span class="stringliteral">"Value of the shared memory decreased to : %d\n"</span>),*ptr); |
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148 <a name="l00182"></a>00182 |
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149 <a name="l00183"></a>00183 <span class="comment">// Signal the mutex and the condition variable.</span> |
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150 <a name="l00184"></a>00184 <span class="keywordflow">if</span>(*ptr < <a class="code" href="sharedmem_8h.html#a0f2ae9d486d80c446844be5480b7bbc2">KUpperThreshold</a>) |
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151 <a name="l00185"></a>00185 { |
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152 <a name="l00186"></a>00186 <span class="comment">// Signal that the level is safe for addition to (re)start.</span> |
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153 <a name="l00187"></a>00187 iCondVar.Signal(); |
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154 <a name="l00188"></a>00188 } |
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155 <a name="l00189"></a>00189 iMutex.Signal(); |
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156 <a name="l00190"></a>00190 } |
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157 <a name="l00191"></a>00191 |
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158 <a name="l00192"></a>00192 LOCAL_D CConsoleBase* console; |
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159 <a name="l00193"></a>00193 LOCAL_C <span class="keywordtype">void</span> DoExampleL(); |
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160 <a name="l00194"></a>00194 LOCAL_C <span class="keywordtype">void</span> callExampleL(); |
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161 <a name="l00195"></a>00195 |
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162 <a name="l00196"></a>00196 LOCAL_C <span class="keywordtype">void</span> DoExampleL() |
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163 <a name="l00197"></a>00197 { |
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164 <a name="l00198"></a>00198 <span class="comment">// Create and install the active scheduler.</span> |
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165 <a name="l00199"></a>00199 CActiveScheduler* scheduler = <span class="keyword">new</span> (ELeave) CActiveScheduler(); |
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166 <a name="l00200"></a>00200 CleanupStack::PushL(scheduler); |
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167 <a name="l00201"></a>00201 CActiveScheduler::Install(scheduler); |
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168 <a name="l00202"></a>00202 |
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169 <a name="l00203"></a>00203 <span class="comment">// Create the CSubtractor object.</span> |
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170 <a name="l00204"></a>00204 <a class="code" href="class_c_subtractor.html">CSubtractor</a>* subtractor = <a class="code" href="class_c_subtractor.html#a7d6002b0b8610a3241853c7fb4ef3995">CSubtractor::NewL</a>(console); |
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171 <a name="l00205"></a>00205 CleanupStack::PushL(subtractor); |
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172 <a name="l00206"></a>00206 |
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173 <a name="l00207"></a>00207 <span class="comment">// Start the timer of the CSubtractor object.</span> |
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174 <a name="l00208"></a>00208 subtractor-><a class="code" href="class_c_subtractor.html#ab5a9d2c973fb9387a6519971ddcb61c2">StartTimer</a>(); |
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175 <a name="l00209"></a>00209 <span class="comment">// Issue an asynchronous read request.</span> |
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176 <a name="l00210"></a>00210 subtractor-><a class="code" href="class_c_subtractor.html#a0d39bfb8170e1923541fa6efd915d206">ReadFunction</a>(); |
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177 <a name="l00211"></a>00211 <span class="comment">// Start the active scheduler.</span> |
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178 <a name="l00212"></a>00212 CActiveScheduler::Start(); |
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179 <a name="l00213"></a>00213 |
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180 <a name="l00214"></a>00214 CleanupStack::PopAndDestroy(2,scheduler); |
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181 <a name="l00215"></a>00215 } |
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182 <a name="l00216"></a>00216 |
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183 <a name="l00217"></a><a class="code" href="subtractor_8cpp.html#a0f358e9c4355138f629b8c4f37310295">00217</a> GLDEF_C TInt E32Main() <span class="comment">// main function called by E32</span> |
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184 <a name="l00218"></a>00218 { |
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185 <a name="l00219"></a>00219 __UHEAP_MARK; |
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186 <a name="l00220"></a>00220 CTrapCleanup* cleanup=CTrapCleanup::New(); <span class="comment">// get clean-up stack</span> |
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187 <a name="l00221"></a>00221 TRAPD(error,callExampleL()); <span class="comment">// more initializations, then do example</span> |
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188 <a name="l00222"></a>00222 <span class="keyword">delete</span> cleanup; <span class="comment">// destroy clean-up stack</span> |
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189 <a name="l00223"></a>00223 __ASSERT_ALWAYS(!error,User::Panic(KTxtEPOC32EX,error)); |
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190 <a name="l00224"></a>00224 __UHEAP_MARKEND; |
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191 <a name="l00225"></a>00225 <span class="keywordflow">return</span> 0; <span class="comment">// and return</span> |
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192 <a name="l00226"></a>00226 } |
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193 <a name="l00227"></a>00227 |
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194 <a name="l00228"></a>00228 LOCAL_C <span class="keywordtype">void</span> callExampleL() <span class="comment">// initialise and call example code under cleanup stack</span> |
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195 <a name="l00229"></a>00229 { |
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196 <a name="l00230"></a>00230 console=Console::NewL(KTxtExampleCode,TSize(KConsFullScreen,KConsFullScreen)); |
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197 <a name="l00231"></a>00231 CleanupStack::PushL(console); |
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198 <a name="l00232"></a>00232 TRAPD(error,DoExampleL()); <span class="comment">// perform example function</span> |
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199 <a name="l00233"></a>00233 <span class="keywordflow">if</span> (error) |
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200 <a name="l00234"></a>00234 console->Printf(KFormatFailed, error); |
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201 <a name="l00235"></a>00235 <span class="keywordflow">else</span> |
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202 <a name="l00236"></a>00236 console->Printf(KTxtOK); |
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203 <a name="l00237"></a>00237 console->Printf(KTxtPressAnyKey); |
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204 <a name="l00238"></a>00238 console->Getch(); <span class="comment">// get and ignore character</span> |
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205 <a name="l00239"></a>00239 CleanupStack::PopAndDestroy(); <span class="comment">// close console</span> |
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206 <a name="l00240"></a>00240 } |
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207 </pre></div></div> |
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208 <hr size="1"/><address style="text-align: right;"><small>Generated by |
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209 <a href="http://www.doxygen.org/index.html"> |
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210 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> |
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211 </body> |
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212 </html> |