Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/observer_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/PIPS/opencproducerconsumerex/src/observer.cpp</h1><a href="observer_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00014"></a>00014 <span class="comment">// INCLUDE FILES</span>
<a name="l00015"></a>00015 <span class="preprocessor">#include <e32std.h></span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <f32file.h></span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <stdio.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <sys/types.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <sys/ipc.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <sys/msg.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <pthread.h></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include "CommanHeader.h"</span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KObserverLogFile, <span class="stringliteral">"C:\\ObserverLogFile.txt"</span>);
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="comment">/*****************************************************************************</span>
<a name="l00030"></a>00030 <span class="comment">* ObserverThreadL</span>
<a name="l00031"></a>00031 <span class="comment">* Function: Observer Thread that does the logging of all the events sent by </span>
<a name="l00032"></a>00032 <span class="comment">* Producer and Consumers</span>
<a name="l00033"></a>00033 <span class="comment">*******************************************************************************/</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 TInt ObserverThreadL( TInt aNoOfMsg )
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037 TInt retVal = KErrNone;
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="comment">//Connect to Symbian File Server and open a file for logging</span>
<a name="l00040"></a>00040 RFs fileSession;
<a name="l00041"></a>00041 User::LeaveIfError(fileSession.Connect());
<a name="l00042"></a>00042 RFile logFile;
<a name="l00043"></a>00043 retVal = logFile.Open(fileSession, KObserverLogFile, EFileWrite);
<a name="l00044"></a>00044 <span class="keywordflow">if</span>(retVal)
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 retVal = logFile.Create(fileSession, KObserverLogFile, EFileWrite);
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048 User::LeaveIfError(retVal);
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">//Create the MRT STDLIBS Message Q</span>
<a name="l00051"></a>00051 key_t msgQFd = msgget(KMSGQKEY, IPC_CREAT);
<a name="l00052"></a>00052 <span class="keywordflow">if</span> (msgQFd == -1)
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054 logFile.Write(_L8(<span class="stringliteral">"Msg Q Creation Failed\r"</span>));
<a name="l00055"></a>00055 <span class="keywordflow">return</span> -1;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057 logFile.Write(_L8(<span class="stringliteral">"Observer is Up and Running\r"</span>));
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">//Construct the message to be send thru msg q</span>
<a name="l00060"></a>00060 <span class="keyword">struct </span>msgbuf* recvMsg = (<span class="keyword">struct </span>msgbuf*)malloc(KMAXSENDMSG);
<a name="l00061"></a>00061 TBuf8<KMAXSENDMSG> logData;
<a name="l00062"></a>00062
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> msgCount = 0; msgCount<aNoOfMsg; msgCount++ )
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 retVal = msgrcv(msgQFd, recvMsg, KMAXSENDMSG, 0, 0);
<a name="l00067"></a>00067 <span class="keywordflow">if</span>(retVal > 0 )
<a name="l00068"></a>00068 {
<a name="l00069"></a>00069 logData.Copy((<span class="keyword">const</span> TUint8 *)recvMsg->mtext, retVal-4);
<a name="l00070"></a>00070 logFile.Write(logData);
<a name="l00071"></a>00071 <span class="comment">//Also flush the info on to console</span>
<a name="l00072"></a>00072 recvMsg->mtext[retVal-4] = <span class="charliteral">'\0'</span>;
<a name="l00073"></a>00073 printf(<span class="stringliteral">"Observer: %s\n"</span>, recvMsg->mtext);
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="comment">//Close the Message Q</span>
<a name="l00078"></a>00078 retVal = msgctl(msgQFd, IPC_RMID, NULL);
<a name="l00079"></a>00079 free(recvMsg);
<a name="l00080"></a>00080
<a name="l00081"></a>00081 logFile.Close();
<a name="l00082"></a>00082 fileSession.Close();
<a name="l00083"></a>00083 <span class="keywordflow">return</span> retVal;
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">/*****************************************************************************</span>
<a name="l00087"></a>00087 <span class="comment">* ObserverThreadEntryPoint</span>
<a name="l00088"></a>00088 <span class="comment">* Function: Observer Thread Entry Point</span>
<a name="l00089"></a>00089 <span class="comment">* As its Symbian Thread, it has to create a cleanup stack and should have</span>
<a name="l00090"></a>00090 <span class="comment">* TOP level TRAP</span>
<a name="l00091"></a>00091 <span class="comment">*******************************************************************************/</span>
<a name="l00092"></a>00092
<a name="l00093"></a>00093 TInt ObserverThreadEntryPoint( TAny* aParam )
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 TInt retVal = KErrNone;
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="comment">// Create a Cleanup Stack for this Thread</span>
<a name="l00098"></a>00098 CTrapCleanup* cleanupStack = CTrapCleanup::New();
<a name="l00099"></a>00099 <span class="keywordflow">if</span>(cleanupStack)
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101 <span class="comment">//Have a top level TRAP</span>
<a name="l00102"></a>00102 TRAP( retVal, retVal = ObserverThreadL( (<span class="keywordtype">int</span>)aParam ));
<a name="l00103"></a>00103 <span class="keyword">delete</span> cleanupStack;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 <span class="keywordflow">else</span>
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107 retVal = KErrNoMemory;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 <span class="keywordflow">return</span> retVal;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="comment">/*****************************************************************************</span>
<a name="l00115"></a>00115 <span class="comment">* CreateObserverThread</span>
<a name="l00116"></a>00116 <span class="comment">* Function: Function that creats Observing Thread (Symbian Thread)</span>
<a name="l00117"></a>00117 <span class="comment">*******************************************************************************/</span>
<a name="l00118"></a>00118
<a name="l00119"></a><a class="code" href="observer_8cpp.html#abe25ac9eb42087610e2949b201e2f0b5">00119</a> <span class="keywordtype">void</span> <a class="code" href="observer_8cpp.html#abe25ac9eb42087610e2949b201e2f0b5">CreateObserverThread</a>( <span class="keywordtype">int</span> aNoOfMsg )
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 RThread thread;
<a name="l00122"></a>00122 TInt stackSize = 0x8000; <span class="comment">//Set the stack size for this thread as 8K</span>
<a name="l00123"></a>00123 thread.Create(_L(<span class="stringliteral">"ObserverThread"</span>), ObserverThreadEntryPoint, stackSize, NULL, (TAny*)aNoOfMsg);
<a name="l00124"></a>00124 TRequestStatus stat;
<a name="l00125"></a>00125 thread.Logon(stat);
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="comment">//Start executing the thread.</span>
<a name="l00128"></a>00128 thread.Resume();
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="comment">//Wait for the thread to Terminate.</span>
<a name="l00131"></a>00131 User::WaitForRequest(stat);
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 } <span class="comment">//extern "C"</span>
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="comment">// End of File</span>
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