Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/consumer_8c_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/consumer.c</h1><a href="consumer_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00015"></a>00015 <span class="comment">/* INCLUDE FILES */</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <sys/types.h></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <sys/ipc.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <sys/msg.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#include "CommanHeader.h"</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="comment">/*****************************************************************************</span>
<a name="l00024"></a>00024 <span class="comment">* ConsumerThreadEntryPoint</span>
<a name="l00025"></a>00025 <span class="comment">* Function: Consumer Thread that consumes as amny as needed items when </span>
<a name="l00026"></a>00026 <span class="comment">* Producer has enough items produced</span>
<a name="l00027"></a>00027 <span class="comment">* It also informs the Observer thread about item consumed</span>
<a name="l00028"></a>00028 <span class="comment">*******************************************************************************/</span>
<a name="l00029"></a>00029
<a name="l00030"></a><a class="code" href="consumer_8c.html#aeb7daec86aaf17cff923e4e69e1ca964">00030</a> <span class="keywordtype">void</span>* <a class="code" href="consumer_8c.html#aeb7daec86aaf17cff923e4e69e1ca964">ConsumerThreadEntryPoint</a>( <span class="keywordtype">void</span>* aParam )
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <a class="code" href="struct_thread_param.html">ThreadParam</a>* args = (<a class="code" href="struct_thread_param.html">ThreadParam</a>*) aParam;
<a name="l00033"></a>00033 <span class="keywordtype">int</span> yetToConsume = args->noOfItems;
<a name="l00034"></a>00034 <span class="keywordtype">int</span> clientId = args->noOfConsumers;
<a name="l00035"></a>00035 <a class="code" href="struct_produced_item.html">ProducedItem</a>* consumeItem;
<a name="l00036"></a>00036 <span class="keywordtype">int</span> ret = 0;
<a name="l00037"></a>00037 key_t msgQFd = -1;
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="comment">/* Construct the message to be send thru msg q */</span>
<a name="l00040"></a>00040 <span class="keyword">struct </span>msgbuf* sendMsg = (<span class="keyword">struct </span>msgbuf*)malloc(KMAXSENDMSG);
<a name="l00041"></a>00041 sendMsg->mtype = 1;
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">/* Get the Handler to Observer Msg Q */</span>
<a name="l00044"></a>00044 msgQFd = msgget(KMSGQKEY, IPC_CREAT);
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keywordflow">while</span> (yetToConsume != 0)
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="comment">/* Acquire the Lock before checking for items available from Producer */</span>
<a name="l00049"></a>00049 sem_wait(&args->itemLock);
<a name="l00050"></a>00050 <span class="comment">/* Pop item from Producved Item-Stack */</span>
<a name="l00051"></a>00051 consumeItem = <a class="code" href="stack_8cpp.html#aaf42677487a6b410248a6c4fef8979fd">PopFromStack</a>();
<a name="l00052"></a>00052 <span class="keywordflow">if</span> (consumeItem == NULL)
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054 <span class="comment">/* No items in the Stack */</span>
<a name="l00055"></a>00055 sem_post(&args->itemLock);
<a name="l00056"></a>00056 <span class="keywordflow">continue</span>;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058 yetToConsume--;
<a name="l00059"></a>00059 <span class="comment">/* Inform the Observer about Item Consumption */</span>
<a name="l00060"></a>00060 sprintf(&sendMsg->mtext, <span class="stringliteral">" Consumer#%d Consuming Produced %s\0"</span>, clientId, consumeItem->itemName);
<a name="l00061"></a>00061 ret = msgsnd(msgQFd, sendMsg, strlen(sendMsg->mtext)+4, 0);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="comment">/* Release the Lock once after getting an item */</span>
<a name="l00064"></a>00064 sem_post(&args->itemLock);
<a name="l00065"></a>00065 <a class="code" href="stack_8cpp.html#ac0da5b0fd0c1fbbee12568b2cfbf5354">FreeItem</a>(consumeItem);
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00068"></a>00068 free( sendMsg );
<a name="l00069"></a>00069 <span class="keywordflow">return</span> (<span class="keywordtype">int</span>*)0;
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="comment">/* End of File */</span>
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