use threads;
use threads::shared;
use strict;
my $wait = 500; my @up: shared; my $th;
my @down: shared;

my @list = qw ( www.apple.com www.perl.org www.ibm.com www.coke.com www.oracle.com www.hp.com );


foreach(@list){
$th = threads->create("ping","$_");
# $th->join;   # new thread is NOT created until join
               # not what I want!
}

# This works... unless one of the threads finishes too
# soon... then the app dies...

$th->join;

print @up;
print @down;

sub ping {
 my $ip = shift;
 my @rv = `ping -n 1 -w $wait $ip`;
 foreach(@rv){ push @up, "$ip up\n" if /\(0% loss\)/;
	push @down, "$ip down\n" if /\(100% loss\)/; }
}