Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/producer_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/producer.c</h1><a href="producer_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 <span class="preprocessor">#include <stdio.h></span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include "CommanHeader.h"</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="preprocessor">#define MIN(X, Y) (X < Y) ? X : Y;</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="comment">/*****************************************************************************</span>
<a name="l00027"></a>00027 <span class="comment">* ProducerThreadEntryPoint</span>
<a name="l00028"></a>00028 <span class="comment">* Function: Producer Thread that produces M number of items at a time </span>
<a name="l00029"></a>00029 <span class="comment">* where M is number of Consumers.</span>
<a name="l00030"></a>00030 <span class="comment">* This thread will produce N number of items where N is total number of items </span>
<a name="l00031"></a>00031 <span class="comment">* needed by all the Consumers.</span>
<a name="l00032"></a>00032 <span class="comment">* It also informs the Observer thread about item production</span>
<a name="l00033"></a>00033 <span class="comment">*******************************************************************************/</span>
<a name="l00034"></a>00034
<a name="l00035"></a><a class="code" href="producer_8c.html#a9ba1d3d3c7c4fefedf72684e9abdc8ee">00035</a> <span class="keywordtype">void</span>* <a class="code" href="producer_8c.html#a9ba1d3d3c7c4fefedf72684e9abdc8ee">ProducerThreadEntryPoint</a>( <span class="keywordtype">void</span>* aParam )
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037 <a class="code" href="struct_thread_param.html">ThreadParam</a>* args = (<a class="code" href="struct_thread_param.html">ThreadParam</a>*) aParam;
<a name="l00038"></a>00038 <span class="keywordtype">int</span> yetToProduce = args->noOfItems;
<a name="l00039"></a>00039 <span class="keywordtype">int</span> produceNow = 0;
<a name="l00040"></a>00040 <span class="keywordtype">int</span> noOfConsumers = args->noOfConsumers;
<a name="l00041"></a>00041 <a class="code" href="struct_produced_item.html">ProducedItem</a> item;
<a name="l00042"></a>00042 key_t msgQFd = -1;
<a name="l00043"></a>00043 <span class="keywordtype">int</span> ret = 0;
<a name="l00044"></a>00044 <span class="comment">/* Construct the message to be send thru msg q */</span>
<a name="l00045"></a>00045 <span class="keyword">struct </span>msgbuf* sendMsg = (<span class="keyword">struct </span>msgbuf*)malloc(KMAXSENDMSG);
<a name="l00046"></a>00046 sendMsg->mtype = 1;
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="comment">/* Get the Handler to Observer Msg Q */</span>
<a name="l00049"></a>00049 msgQFd = msgget(KMSGQKEY, IPC_CREAT);
<a name="l00050"></a>00050
<a name="l00051"></a>00051 item.itemNum = 1;
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="keywordflow">while</span> (yetToProduce != 0)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 produceNow = MIN(yetToProduce, noOfConsumers);
<a name="l00056"></a>00056 yetToProduce -= produceNow;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/* Acquire the Lock so that Producer can Produce "produceNow" items once. */</span>
<a name="l00059"></a>00059 sem_wait(&args->itemLock);
<a name="l00060"></a>00060 <span class="keywordflow">for</span>(;produceNow != 0; produceNow--)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 sprintf(item.itemName, <span class="stringliteral">"Item-Number: #%d"</span>, item.itemNum);
<a name="l00063"></a>00063 <span class="comment">/* Push this item on to Stack so that Consumetrs can take it.*/</span>
<a name="l00064"></a>00064 <a class="code" href="stack_8cpp.html#a90e98e7c8440177d0df072df573cc038">PushOntoStack</a>(&item);
<a name="l00065"></a>00065 item.itemNum++;
<a name="l00066"></a>00066 <span class="comment">/* Inform the Observer about Item Production */</span>
<a name="l00067"></a>00067 sprintf(sendMsg->mtext, <span class="stringliteral">" Producer Produced %s\0"</span>, item.itemName);
<a name="l00068"></a>00068 ret = msgsnd(msgQFd, sendMsg, strlen(sendMsg->mtext)+4, 0);
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 <span class="comment">/* Release the Lock so that Consumers can consume produced items. */</span>
<a name="l00071"></a>00071 sem_post(&args->itemLock);
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 free( sendMsg );
<a name="l00075"></a>00075 <span class="keywordflow">return</span> (<span class="keywordtype">int</span>*)0;
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="comment">/* End of File */</span>
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