This post takes code that was given to me from a previous post.

Within a loop the following is run:

      


      my $timer_go:shared = 0;
      
      my $worker = threads->create(\&worker, $call);
      my $timer = threads->create(\&timer,$worker);
   
      
      $timer_go=1;
      
      $timer->join();
      $worker->join();
[download]

The subroutines used are:

sub timer {
  my $worker = shift;
  my $timer_go;

   while(1){     
       if($timer_go){
        my $count = 0;
             while(1){ 
                  $count++;
                  if($count > 20){    
                         print "timed out\nHit enter to finish\n";
                          # Send a signal to a thread
                         $worker->kill('INT');
                         return;
                        } 
                  sleep 1;
                  print "timing $count\n";
            }
       }else{sleep 1}
    }
}

sub worker {
    my $call = shift;
    
    $|++;
    $SIG{INT} = sub{ warn "Caught Zap!\n"; sleep 1; exit; };
    
    # do your timed program here.
    
    
    #print "I am here \n\n";

    print $call;

    #exit;
    
    system ($call);    # This is where my system call is
    
  
    my $worker_pid = open( READ, "top -d 1 -b |" );
    
    print "\t$worker_pid\n";
    while(<READ>){  }
    return;

}
[download]

For some reason unkown to me the system call works within the subroutine only once. Are all the processes killed and not just the one? I want to do the equivalent of me entering control-C in my Linux command line prompt. Presumably that is not happening with my Perl script.