use SNMP;
use Net::MAC;
my $ip_address : shared= "";
my $pool : shared = 0;
my $nthreads = 10; # Number of threads in pool

##</code><code>##

 
foreach (1..$nthreads) {
    threads->create(\&getIP);
}

##</code><code>##

foreach $ip (@ip_addresses) {

   $ip_address = $ip;

   if ($pool==0) {
        print "Main thread has no service threads available, yielding\n";
        threads->yield until $pool>0;
   }

   print "Main thread has $pool service threads available\n";

   # signal that a new line is ready
   {
     lock $pool;
     cond_signal $pool;
   }

   print "Main thread sent signal, waiting to be signaled\n";

   # wait for whichever thread wakes up to signal us
   {
     lock $ip_address;
     cond_wait $ip_address;
   }

   print "Main thread received signal, reading next line\n";


}

##</code><code>##

sub getIP {

  while (1) {

                print "Thread ",$self->tid," waiting\n";
                {
                        lock $pool;
                        $pool++;
                        print "Pool incrementada : $pool\n";
                        cond_wait $pool; #all threads wait here for signal
                        $pool--;
                        print "Pool decrementadas : $pool \n";
                }

                # Here i get the ip address
                my $t_ip = $ip_address;

                sleep 1;

               # now let's tell main that we already have the ip address
                print "Thread ",$self->tid," retrieved data, signaling main\n";
                {
                        lock ($ip_address);
                        cond_signal ($ip_address);
                }

               #now i do the snmp session in the thread plus a snmpget
               my $sess = new SNMP::Session (DestHost => $t_ip, Community => ..., Version => '2c', UseSprintValue => '1')
or die "couldn't open a session";

               #The oid
               my $itens = new SNMP::VarList(['sometextthing', $oid]) or die "couldn't create a varlist";
               $info = $sess->get($itens) or die "couldn't get info";
...
}
}