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<HTML>
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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 3</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 3</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.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Synch_T.h"</FONT>
<P><FONT COLOR="#FF0000">//Arguments that are to be passed to the worker
thread are passed through this class.</FONT>
<BR>class Args{
<BR>public:
<BR>Args(ACE_Lock* lock,int iterations):
<BR> mutex_(lock),iterations_(iterations){}
<BR>ACE_Lock* mutex_;
<BR>int iterations_;
<BR>};
<P><FONT COLOR="#FF0000">//The starting point for the worker threads</FONT>
<BR>static void*
<BR>worker(void*arguments){
<BR>Args *arg= (Args*) arguments;
<BR>for(int i=0;i<arg->iterations_;i++){
<BR> ACE_DEBUG((LM_DEBUG,
<BR> "(%t) Trying to get a hold of this iteration\n"));
<BR><FONT COLOR="#FF0000"> //This is our critical section</FONT>
<BR> arg->mutex_->acquire();
<BR> ACE_DEBUG((LM_DEBUG,"(%t) This is iteration number %d\n",i));
<BR><FONT COLOR="#FF0000"> //work</FONT>
<BR> ACE_OS::sleep(2);
<BR> arg->mutex_->release();
<BR> }
<BR>return 0;
<BR>}
<P>int main(int argc, char*argv[]){
<BR>if(argc<4){
<BR> ACE_OS::printf("Usage: egx <number_of_threads>
<BR> <number_of_iterations> <lock_type>\n");
<BR> ACE_OS::exit(1);
<BR> }
<BR><FONT COLOR="#FF0000">//Lock used by application</FONT>
<BR>ACE_Lock *lock;
<P><FONT COLOR="#FF0000">//Decide which lock you want to use at run time.
Possible due to</FONT>
<BR><FONT COLOR="#FF0000">//ACE_Lock.</FONT>
<BR>if(ACE_OS::strcmp(argv[3],"Thread"))
<BR> lock=new ACE_Lock_Adapter<ACE_Thread_Mutex>;
<BR>else
<BR> lock=new ACE_Lock_Adapter<ACE_Mutex>
<P><FONT COLOR="#FF0000">//Setup the arguments</FONT>
<BR>Args arg(lock,ACE_OS::atoi(argv[2]));
<BR><FONT COLOR="#FF0000">//Spawn the worker threads</FONT>
<BR>ACE_Thread::spawn_n
<BR> (ACE_OS::atoi(argv[1]),(ACE_THR_FUNC)worker,(void*)&arg);
<BR>while(ACE_Thread::join(NULL,NULL,NULL)==0);
<BR>}
<P> <A HREF="ex04.html">Next Example</A>
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