Multithreading for perl code

Question

I need to know how to implement multi threading for the following code . I need to call this script every second but the sleep timer processes it after 2 seconds . In total script call itself after every 3 seconds. But i need to call it every second , can anybody provide me a solution to it or point me to right direction.

#!usr/bin/perl
use warnings;

sub print
{
local $gg = time;
print "$gg\n";
}

$oldtime = (time + 1);
while(1)
{
if(time > $oldtime)
{
    &print();
    sleep 2;
    $oldtime = (time + 1);
            }
        }

Its just an example.