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<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 6</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">//// Chapter: "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">//// 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 6</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_Condition<ACE_Thread_Mutex> *cond, int threads):
<BR> cond_(cond), threads_(threads){}
<BR>ACE_Condition<ACE_Thread_Mutex> *cond_;
<BR>int threads_;
<BR>};
<P>static void*
<BR>worker(void *arguments){
<BR> Args *arg= (Args*)arguments;
<BR> ACE_DEBUG((LM_DEBUG,"Thread (%t) Created to do some work\n"));
<BR> ::number++;
<BR><FONT COLOR="#FF0000"> //Work</FONT>
<BR> ACE_OS::sleep(ACE_OS::rand()%2);
<P><FONT COLOR="#FF0000"> //Exiting now</FONT>
<BR> ACE_DEBUG((LM_DEBUG,
<BR> "\tThread (%t) Done! \n\tThe number is now: %d\n",number));
<BR><FONT COLOR="#FF0000"> //If all threads are done signal main thread
that program can now exit</FONT>
<BR> if(number==arg->threads_){
<BR> ACE_DEBUG((LM_DEBUG,
<BR> "(%t) Last Thread!\n All threads have done
their job!
<BR> Signal main thread\n"));
<BR> arg->cond_->signal();
<BR> }
<BR>return 0;
<BR>}
<BR>
<P>int main(int argc, char *argv[]){
<BR>if(argc<2){
<BR> ACE_DEBUG((LM_DEBUG,"Usage: <program_name> <number of threads>\n"));
<BR> ACE_OS::exit(1);
<BR> }
<BR>
<BR>int n_threads=ACE_OS::atoi(argv[1]);
<P><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_Thread_Mutex mutex;
<BR>ACE_Condition<ACE_Thread_Mutex> cond(mutex);
<BR>Args arg(&cond,n_threads);
<P><FONT COLOR="#FF0000">//Spawn off n_threads number of threads</FONT>
<BR>for(int i=0; i<n_threads; i++){
<BR> if(ACE_Thread::spawn((ACE_THR_FUNC)worker,(void*)&arg,
<BR> THR_DETACHED|THR_NEW_LWP)==-1)
<BR> ACE_DEBUG((LM_DEBUG,"Error in spawning thread\n"));
<BR> }
<P><FONT COLOR="#FF0000">//Wait for signal indicating that all threads
are done and program can exit</FONT>
<BR>mutex.acquire();
<BR>if(number!=n_threads)
<BR> cond.wait();
<BR>ACE_DEBUG((LM_DEBUG,"(%t) Main Thread got signal. Program exiting..\n"));
<BR>mutex.release();
<BR>ACE_OS::exit(0);
<BR>}
<P> <A HREF="ex07.html">Next Example</A>
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