Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/libpthreadexample_8cpp_source.html
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<h1>examples/PIPS/LibpThreadExample/src/libpthreadexample.cpp</h1><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>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">// Include Files </span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#include "libpthreadexample.h"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <e32base.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <e32std.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <e32cons.h></span> <span class="comment">// Console</span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <pthread.h></span> <span class="comment">//Used for all the functions with prefix pthread_</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <f32file.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "unistd.h"</span> <span class="comment">//USed for sleep()</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="comment">// Constants</span>
<a name="l00026"></a>00026 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTestFile,<span class="stringliteral">"c:\\newfile.txt"</span>); <span class="comment">//Text file as the shared resource</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="comment">// Global Variables</span>
<a name="l00029"></a>00029 LOCAL_D CConsoleBase* console; <span class="comment">// Write all messages to this</span>
<a name="l00030"></a>00030 pthread_mutex_t mutex; <span class="comment">//mutex </span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/*</span>
<a name="l00033"></a>00033 <span class="comment"> * This function is the routine for threadOne. It writes "one" in the text file. </span>
<a name="l00034"></a>00034 <span class="comment"> * A mutex is used to avoid race condition amongst the threads </span>
<a name="l00035"></a>00035 <span class="comment"> */</span>
<a name="l00036"></a>00036 <span class="keywordtype">void</span> *TestFunction1L(<span class="keywordtype">void</span>*)
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 <span class="comment">// Start a file server session</span>
<a name="l00039"></a>00039 RFs aFs;
<a name="l00040"></a>00040 User::LeaveIfError(aFs.Connect());
<a name="l00041"></a>00041
<a name="l00042"></a>00042 RFile file;
<a name="l00043"></a>00043 pthread_mutex_lock(&mutex); <span class="comment">//Lock the mutex for threadone. </span>
<a name="l00044"></a>00044 TInt pos = 0;
<a name="l00045"></a>00045 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i<5; i++)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 <span class="comment">//Push the file object on the cleanup stack before doing any file operation which could leave. </span>
<a name="l00048"></a>00048 CleanupClosePushL(file);
<a name="l00049"></a>00049 file.Open(aFs,KTestFile,EFileRead|EFileWrite);
<a name="l00050"></a>00050
<a name="l00051"></a>00051 _LIT8(KWriteBuf,<span class="stringliteral">"One, \n"</span>);
<a name="l00052"></a>00052 file.Seek(ESeekEnd, pos );
<a name="l00053"></a>00053 file.Write(pos ,KWriteBuf);
<a name="l00054"></a>00054 CleanupStack::PopAndDestroy(&file);
<a name="l00055"></a>00055 file.Close();
<a name="l00056"></a>00056 User::After(1000000); <span class="comment">//Wait for 0.1 s to ensure a visible interthreading mechanism</span>
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058 aFs.Close();
<a name="l00059"></a>00059 pthread_mutex_unlock(&mutex); <span class="comment">//Release the mutex . </span>
<a name="l00060"></a>00060 <span class="keywordflow">return</span> NULL;
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="comment">/*</span>
<a name="l00064"></a>00064 <span class="comment"> * This function is the routine for threadTwo. It writes "two" in the text file. </span>
<a name="l00065"></a>00065 <span class="comment"> * A mutex is used to avoid race condition amongst the threads </span>
<a name="l00066"></a>00066 <span class="comment"> */</span>
<a name="l00067"></a>00067 <span class="keywordtype">void</span> *TestFunction2L(<span class="keywordtype">void</span>*)
<a name="l00068"></a>00068 {
<a name="l00069"></a>00069 <span class="comment">// Start a file server session</span>
<a name="l00070"></a>00070 RFs aFs;
<a name="l00071"></a>00071 User::LeaveIfError(aFs.Connect());
<a name="l00072"></a>00072
<a name="l00073"></a>00073 RFile file;
<a name="l00074"></a>00074 pthread_mutex_lock(&mutex); <span class="comment">//Lock the mutex for threadone. </span>
<a name="l00075"></a>00075 TInt pos = 0;
<a name="l00076"></a>00076 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i<5; i++)
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 <span class="comment">//Push the file object on the cleanup stack before doing any file operation which could leave. </span>
<a name="l00079"></a>00079 CleanupClosePushL(file);
<a name="l00080"></a>00080 file.Open(aFs, KTestFile, EFileRead|EFileWrite);
<a name="l00081"></a>00081
<a name="l00082"></a>00082 _LIT8(KWriteBuf, <span class="stringliteral">"Two, \n"</span>);
<a name="l00083"></a>00083 file.Seek(ESeekEnd, pos );
<a name="l00084"></a>00084 file.Write(pos, KWriteBuf);
<a name="l00085"></a>00085 CleanupStack::PopAndDestroy(&file);
<a name="l00086"></a>00086 file.Close();
<a name="l00087"></a>00087 User::After(1000000); <span class="comment">//Wait for 0.1 s to ensure a visible interthreading mechanism</span>
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 aFs.Close();
<a name="l00090"></a>00090 pthread_mutex_unlock(&mutex);
<a name="l00091"></a>00091 <span class="keywordflow">return</span> NULL;
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">/*</span>
<a name="l00095"></a>00095 <span class="comment"> * This function is the routine for threadThree. It writes "three" in the text file. </span>
<a name="l00096"></a>00096 <span class="comment"> * A mutex is used to avoid race condition amongst the threads </span>
<a name="l00097"></a>00097 <span class="comment"> */</span>
<a name="l00098"></a>00098 <span class="keywordtype">void</span> *TestFunction3L(<span class="keywordtype">void</span>*)
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="comment">// Start a file server session</span>
<a name="l00101"></a>00101 RFs aFs;
<a name="l00102"></a>00102 User::LeaveIfError(aFs.Connect());
<a name="l00103"></a>00103
<a name="l00104"></a>00104 RFile file;
<a name="l00105"></a>00105 pthread_mutex_lock(&mutex);
<a name="l00106"></a>00106 TInt pos = 0;
<a name="l00107"></a>00107 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i<5;i++ )
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 <span class="comment">//Push the file object on the cleanup stack before doing any file operation which could leave. </span>
<a name="l00110"></a>00110 CleanupClosePushL(file);
<a name="l00111"></a>00111 file.Open(aFs,KTestFile,EFileRead|EFileWrite);
<a name="l00112"></a>00112
<a name="l00113"></a>00113 _LIT8(KWriteBuf,<span class="stringliteral">"Three ,\n"</span>);
<a name="l00114"></a>00114 file.Seek(ESeekEnd , pos );
<a name="l00115"></a>00115 file.Write(pos ,KWriteBuf);
<a name="l00116"></a>00116 CleanupStack::PopAndDestroy(&file);
<a name="l00117"></a>00117 file.Close();
<a name="l00118"></a>00118 User::After(1000000); <span class="comment">//Wait for 0.1 s to ensure a visible interthreading mechanism </span>
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120 aFs.Close();
<a name="l00121"></a>00121 pthread_mutex_unlock(&mutex);
<a name="l00122"></a>00122 <span class="keywordflow">return</span> NULL;
<a name="l00123"></a>00123 }
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">/*</span>
<a name="l00126"></a>00126 <span class="comment">* The following function creates three threads which starts executing as soon as it is created</span>
<a name="l00127"></a>00127 <span class="comment">* it creates a text file which is used as a shared resource . The main thread will wait till </span>
<a name="l00128"></a>00128 <span class="comment">* child threads completes its execution . </span>
<a name="l00129"></a>00129 <span class="comment">*/</span>
<a name="l00130"></a>00130 <span class="keywordtype">int</span> CreateThreadL()
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 <span class="comment">//Three threads declared.</span>
<a name="l00133"></a>00133 pthread_t threadOne;
<a name="l00134"></a>00134 pthread_t threadTwo;
<a name="l00135"></a>00135 pthread_t threadThree;
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMain ,<span class="stringliteral">"in main\n"</span> );
<a name="l00138"></a>00138 console->Write(KMain);
<a name="l00139"></a>00139 <span class="comment">//Start a file server session </span>
<a name="l00140"></a>00140 RFs aFs;
<a name="l00141"></a>00141 User::LeaveIfError(aFs.Connect());
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="comment">//Create a text file which can be used as a shared resource. </span>
<a name="l00144"></a>00144 RFile file;
<a name="l00145"></a>00145 CleanupClosePushL(file);
<a name="l00146"></a>00146 file.Create(aFs ,KTestFile,EFileRead|EFileWrite);
<a name="l00147"></a>00147 CleanupStack::PopAndDestroy(&file);
<a name="l00148"></a>00148 file.Close();
<a name="l00149"></a>00149 aFs.Close();
<a name="l00150"></a>00150 <span class="comment">//Create and initialize mutex for synchronization </span>
<a name="l00151"></a>00151 <span class="keywordflow">if</span>((pthread_mutex_init(&mutex,NULL)) != 0)
<a name="l00152"></a>00152 {
<a name="l00153"></a>00153 <span class="keywordflow">return</span> -1;
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="comment">//Create threadOne.. thread is in running state. </span>
<a name="l00157"></a>00157 TInt err1 = pthread_create(&threadOne,NULL,TestFunction1L, NULL);
<a name="l00158"></a>00158 User::LeaveIfError(err1);
<a name="l00159"></a>00159 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KThreadOneCreated , <span class="stringliteral">"ThreadOne created\n"</span>);
<a name="l00160"></a>00160 console->Write(KThreadOneCreated);
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">//Create threadTwo.. thread is in running state.</span>
<a name="l00163"></a>00163 TInt err2 = pthread_create(&threadTwo,NULL,TestFunction2L, NULL);
<a name="l00164"></a>00164 User::LeaveIfError(err2);
<a name="l00165"></a>00165 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KThreadTwoCreated , <span class="stringliteral">"ThreadTwo created\n"</span>);
<a name="l00166"></a>00166 console->Write(KThreadTwoCreated);
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="comment">//Create threadThree.. thread is in running state.</span>
<a name="l00169"></a>00169 TInt err3 = pthread_create(&threadThree,NULL,TestFunction3L, NULL);
<a name="l00170"></a>00170 User::LeaveIfError(err3);
<a name="l00171"></a>00171 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KThreadThreeCreated , <span class="stringliteral">"ThreadThree created\n"</span>);
<a name="l00172"></a>00172 console->Write(KThreadThreeCreated);
<a name="l00173"></a>00173
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">//------Main thread waits for other threads to complete ---- </span>
<a name="l00176"></a>00176 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KWait , <span class="stringliteral">"Waiting for child threads to complete execution\n"</span>);
<a name="l00177"></a>00177 console->Write(KWait);
<a name="l00178"></a>00178
<a name="l00179"></a>00179 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KJoinError , <span class="stringliteral">"Error in pthread_join()"</span>);
<a name="l00180"></a>00180 <span class="comment">//Main thread waits for threadOne to complete execution</span>
<a name="l00181"></a>00181 <span class="keywordflow">if</span>(pthread_join(threadOne, NULL) != 0)
<a name="l00182"></a>00182 {
<a name="l00183"></a>00183 console->Write(KJoinError);
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 <span class="keywordflow">else</span>
<a name="l00186"></a>00186 {
<a name="l00187"></a>00187 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KRetThreadOne ,<span class="stringliteral">"Returned from threadone\n"</span>);
<a name="l00188"></a>00188 console->Write(KRetThreadOne); <span class="comment">//Control comes to main thread once threadOne completes execution.</span>
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190
<a name="l00191"></a>00191 <span class="comment">//Main thread waits for threadTwo to complete execution</span>
<a name="l00192"></a>00192 <span class="keywordflow">if</span>(pthread_join(threadTwo, NULL) != 0)
<a name="l00193"></a>00193 {
<a name="l00194"></a>00194 console->Write(KJoinError);
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196 <span class="keywordflow">else</span>
<a name="l00197"></a>00197 {
<a name="l00198"></a>00198 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KRetThreadTwo ,<span class="stringliteral">"Returned from threadtwo\n"</span>);
<a name="l00199"></a>00199 console->Write(KRetThreadTwo); <span class="comment">//Control comes to main thread once threadTwo completes execution.</span>
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="comment">//Main thread waits for threadThree to complete execution</span>
<a name="l00203"></a>00203 <span class="keywordflow">if</span>(pthread_join(threadThree, NULL) != 0)
<a name="l00204"></a>00204 {
<a name="l00205"></a>00205 console->Write(KJoinError);
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207 <span class="keywordflow">else</span>
<a name="l00208"></a>00208 {
<a name="l00209"></a>00209 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KRetThreadThree ,<span class="stringliteral">"Returned from threadthree\n"</span>);
<a name="l00210"></a>00210 console->Write(KRetThreadThree); <span class="comment">//Control comes to main thread once threadTwo completes execution.</span>
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212 <span class="comment">//Clean up</span>
<a name="l00213"></a>00213 pthread_mutex_destroy(&mutex);
<a name="l00214"></a>00214 <span class="keywordflow">return</span> -1;
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a>00217 <span class="comment">// Local Functions</span>
<a name="l00218"></a>00218
<a name="l00219"></a>00219 LOCAL_C <span class="keywordtype">void</span> MainL()
<a name="l00220"></a>00220 {
<a name="l00221"></a>00221 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KHello , <span class="stringliteral">"Welcome to the LibpThread example, we will create three threads and use them to print data to \\epoc32\\winscw\\c\\newfile.txt\n\n"</span>);
<a name="l00222"></a>00222 console->Write(KHello);
<a name="l00223"></a>00223 CreateThreadL();
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225
<a name="l00226"></a>00226 LOCAL_C <span class="keywordtype">void</span> DoStartL()
<a name="l00227"></a>00227 {
<a name="l00228"></a>00228 MainL();
<a name="l00229"></a>00229 }
<a name="l00230"></a>00230
<a name="l00231"></a>00231 <span class="comment">// Global Functions</span>
<a name="l00232"></a>00232
<a name="l00233"></a>00233 GLDEF_C TInt E32Main()
<a name="l00234"></a>00234 {
<a name="l00235"></a>00235 <span class="comment">// Create cleanup stack</span>
<a name="l00236"></a>00236 __UHEAP_MARK;
<a name="l00237"></a>00237 CTrapCleanup* cleanup = CTrapCleanup::New();
<a name="l00238"></a>00238 <span class="comment">// Create output console</span>
<a name="l00239"></a>00239 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextConsoleTitle, <span class="stringliteral">"Console"</span>);
<a name="l00240"></a>00240 TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen)));
<a name="l00241"></a>00241 <span class="keywordflow">if</span> (createError)
<a name="l00242"></a>00242 <span class="keywordflow">return</span> createError;
<a name="l00243"></a>00243 <span class="comment">// Run application code inside TRAP harness, wait keypress when terminated</span>
<a name="l00244"></a>00244 TRAPD(mainError, DoStartL());
<a name="l00245"></a>00245 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextFailed, <span class="stringliteral">" failed, leave code = %d"</span>);
<a name="l00246"></a>00246 <span class="keywordflow">if</span> (mainError)
<a name="l00247"></a>00247 console->Printf(KTextFailed, mainError);
<a name="l00248"></a>00248 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextPressAnyKey, <span class="stringliteral">" [press any key]\n"</span>);
<a name="l00249"></a>00249 console->Printf(KTextPressAnyKey);
<a name="l00250"></a>00250 console->Getch();
<a name="l00251"></a>00251 <span class="keyword">delete</span> console;
<a name="l00252"></a>00252 <span class="keyword">delete</span> cleanup;
<a name="l00253"></a>00253 __UHEAP_MARKEND;
<a name="l00254"></a>00254 <span class="keywordflow">return</span> KErrNone;
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256
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