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<HTML>
<!-- $Id$ -->
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="Ambreen Ilyas">
<META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (X11; I; SunOS 5.5.1 sun4u) [Netscape]">
<TITLE>Example 1</TITLE>
</HEAD>
<BODY>
<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">//// Chapter: "The Message Queue"</FONT>
<BR><FONT COLOR="#CC0000">//// For details please see the guide at</FONT>
<BR><FONT COLOR="#CC0000">//// http://www.cs.wustl.edu/~schmidt/ACE.html</FONT>
<BR><FONT COLOR="#CC0000">//// AUTHOR: Umar Syyid (usyyid@hns.com)</FONT>
<BR><FONT COLOR="#CC0000">//// and Ambreen Ilyas (ambreen@bitsmart.com)</FONT>
<BR><FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<P><FONT COLOR="#CC0000">//Example 1</FONT>
<BR><FONT COLOR="#000099">#include</FONT> "<FONT COLOR="#006600">ace/Message_Queue.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Get_Opt.h"</FONT>
<BR><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">SIZE_BLOCK
1</FONT>
<BR><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">NO_MSGS
10</FONT>
<P>class QTest{
<BR>public:
<BR>QTest():no_msgs_(NO_MSGS){
<BR> <FONT COLOR="#FF0000">//First create a message queue of default
size.</FONT>
<BR> if(!(this->mq_=new ACE_Message_Queue<ACE_NULL_SYNCH> ()))
<BR> ACE_DEBUG((LM_ERROR,"Error in message queue initialization \n"));
<BR> }
<BR>
<BR>int start_test(){
<BR> for(int i=0; i<no_msgs_;i++){
<BR> <FONT COLOR="#FF0000">//create a new message block of size 1</FONT>
<BR> ACE_Message_Block *mb= new ACE_Message_Block(SIZE_BLOCK);<FONT COLOR="#FF0000"></FONT>
<P><FONT COLOR="#FF0000"> //Insert data into the message block using
the rd_ptr</FONT>
<BR> *mb->wr_ptr()=i;
<P><FONT COLOR="#FF0000"> //Be careful to advance the wr_ptr</FONT>
<BR> mb->wr_ptr(1);
<P> <FONT COLOR="#FF0000">//Enqueue the message block onto the message
queue</FONT>
<BR> if(this->mq_->enqueue_prio(mb)==-1){
<BR> ACE_DEBUG((LM_ERROR,"\nCould not enqueue on to mq!!\n"));
<BR> return -1;
<BR> }
<BR>
<BR> ACE_DEBUG((LM_INFO,"EQd data: %d\n",*mb->rd_ptr()));
<BR> } <FONT COLOR="#FF0000">//end for</FONT>
<P><FONT COLOR="#FF0000">//Now dequeue all the messages</FONT>
<BR>this->dequeue_all();
<BR>return 0;
<BR> }
<P>void dequeue_all(){
<BR> ACE_DEBUG((LM_INFO,"\n\nBeginning DQ \n"));
<BR> ACE_DEBUG((LM_INFO,"No. of Messages on Q:%d Bytes on Q:%d \n",mq_->message_count(),
mq_->message_bytes()));
<BR> ACE_Message_Block *mb;
<P> <FONT COLOR="#FF0000">//dequeue the head of the message queue
until no more messages are left</FONT>
<BR> for(int i=0;i<no_msgs_;i++){
<BR> mq_->dequeue_head(mb);
<BR> ACE_DEBUG((LM_INFO,"DQd data %d\n",*mb->rd_ptr()));
<BR> }
<BR> }
<BR>private:
<BR> ACE_Message_Queue<ACE_NULL_SYNCH> *mq_;
<BR> int no_msgs_;
<BR>};
<BR>
<P>int main(int argc, char* argv[]){
<BR> QTest test;
<BR> if(test.start_test()<0)
<BR> ACE_DEBUG((LM_ERROR,"Program failure \n"));
<BR>}
<P> <A HREF="ex02.html">Next Example</A>
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