use strict;
use warnings;

use threads;
use Thread::Queue;

my $q = Thread::Queue->new();    # A new empty queue
my $thr = threads->create(
    sub {
        # Thread will loop until no more work
        while (defined(my $item = $q->dequeue())) {
            print "starting work on $item\n";
            sleep 5;
            print "finished work on $item\n";
        }
    }
);

my $item = 1;
{
    local $SIG{INT} = sub { $q->enqueue($item++) };
    kill 'INT', $$;
    sleep 2;
    kill 'INT', $$;
    sleep 2;
}
$q->enqueue(undef); # I think in more modern Thread::Queue has $q->end
$thr->join();