use threads;
use threads::shared;

my $semaphore = new Thread::Semaphore;
my $live_threads :shared = 0;
my $thrwait_to_finish :shared = 5;
my $maximum_active_threads :shared = 10;
my @tid_array :shared;

my @commands = ("show ip interface brief | exclude unassigned",
		"show vlan",
		"show vrf");

my @machines = ('1.1.1.1', '2.2.2.2', '3.3.3.3');

foreach my $cmd (@commands)
{
    foreach my $machine_name (@machines)
    {
	my $url = "http://proxy:port/api/device/$machine_name/execute?cmd=$cmd";
	if ($live_threads >= $maximum_active_threads)
	{
	    my $new_thread_num = wait_for_finish();
	    $semaphore->down();
	    $live_threads = $new_thread_num;
	    $semaphore->up();
	}
	else
	{
	    my $thread = threads->create('get_request', $cmd, $url, $machine_name);
	    my $tid = $thread->tid();
	    $semaphore->down();
	    push (@tid_array, $tid);
	    $live_threads++;
	    $semaphore->up();
	}
    }
}
sub get_request
{
    sleep 1;
    my $cmd = $_[0];
    my $url = $_[1];
    my $machine_name = $_[2];
    my $thread_id = threads->tid();
    my $count = '0';
    ...
    $web_response = $response->content;
    ...
    while ($thread_id != $tid_array[0])
    {
        print "Thread_sleaping: $thread_id\n";
        sleep 1;
    }
    ...
    $semaphore->down();
    shift @tid_array;
    $semaphore->up();
    print $fh ($webresponse);
}