docs/tutorials/Chap_4/ex07.html


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   <TITLE>Example 7</TITLE>
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<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">////&nbsp; Chapter:&nbsp; "Thread Management"</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">////&nbsp; 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 7</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Thread.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/OS.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Synch_T.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Synch.h"</FONT>

<P>static int number=0;
<BR>static int seed=0;

<P>class Args{
<BR>public:
<BR>Args(ACE_Barrier *barrier):
<BR>&nbsp;barrier_(barrier){}
<BR>ACE_Barrier *barrier_;
<BR>};

<P>static void*
<BR>worker(void *arguments){
<BR>&nbsp;Args *arg= (Args*)arguments;
<BR>&nbsp;ACE_DEBUG((LM_DEBUG,"Thread (%t) Created to do some work\n"));
<BR>&nbsp;::number++;
<BR>&nbsp;
<BR><FONT COLOR="#FF0000">&nbsp;//Work</FONT>
<BR>&nbsp;ACE_OS::sleep(ACE_OS::rand()%2);

<P><FONT COLOR="#FF0000">&nbsp;//Exiting now</FONT>
<BR>&nbsp;ACE_DEBUG((LM_DEBUG,
<BR>&nbsp;&nbsp;&nbsp; "\tThread (%t) Done! \n\tThe number is now: %d\n",number));
<BR><FONT COLOR="#FF0000">&nbsp;//Let the barrier know we are done.</FONT>
<BR>&nbsp;arg->barrier_->wait();
<BR>&nbsp;ACE_DEBUG((LM_DEBUG,"Thread (%t) is exiting \n"));
<BR>&nbsp;return 0;
<BR>}
<BR>&nbsp;

<P>int main(int argc, char *argv[]){
<BR>if(argc&lt;2){
<BR>&nbsp;ACE_DEBUG((LM_DEBUG,"Usage: &lt;program_name> &lt;number of threads>\n"));
<BR>&nbsp;ACE_OS::exit(1);
<BR>&nbsp;}
<BR>&nbsp;
<BR>int n_threads=ACE_OS::atoi(argv[1]);
<BR>ACE_DEBUG((LM_DEBUG,"Preparing to spawn %d threads",n_threads));
<BR><FONT COLOR="#FF0000">//Setup the random number generator</FONT>
<BR>ACE_OS::srand(::seed);

<P><FONT COLOR="#FF0000">//Setup arguments for threads</FONT>
<BR>ACE_Barrier barrier(n_threads);
<BR>Args arg(&amp;barrier);

<P><FONT COLOR="#FF0000">//Spawn off n_threads number of threads</FONT>
<BR>for(int i=0; i&lt;n_threads; i++){ if(ACE_Thread::spawn((ACE_THR_FUNC)worker,(void*)&amp;arg,THR_DETACHED|THR_NEW_LWP)==-1)
<BR>&nbsp; ACE_DEBUG((LM_DEBUG,"Error in spawning thread\n"));
<BR>&nbsp;}

<P><FONT COLOR="#FF0000">//Wait for all the other threads to let the main
thread</FONT>
<BR><FONT COLOR="#FF0000">// know that they are done using hte barrier</FONT>
<BR>barrier.wait();
<BR>ACE_DEBUG((LM_DEBUG,"(%t)Other threads are finished. Program exiting..\n"));
<BR>ACE_OS::sleep(2);
<BR>}

<P>&nbsp;<A HREF="ex08.html">Next Example</A>
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