For learning purposes, I am toying around with the idea of building event-driven programs in Perl and noticed that it might be nice if a subroutine that was registered as an event handler could, on failure, just schedule another call to itself for a later time. So far, I have come up with something like this:

my $cb;
my $try = 3;
$cb = sub {
    my $rc = do_stuff();
    if (!$rc && --$try) {
        schedule_event($cb, 10); # schedule $cb to be called in 10 seconds
    } else {
        do_other_stuff;
    }
};
schedule_event($cb, 0); # schedule initial call to $cb to be performed ASAP

Is there a way that code inside the sub can access the coderef to that sub so I could do without using an extra variable? I'd like to schedule the initial call like this.

schedule_event( sub { ... }, 0);

I first thought of using caller(0)[3], but this only gives me a function name, (__ANON__ if there's no name), not a code reference that has a pad attached to it.