You could try:

$SIG{HUP} = sub { delete $INC{'MyRoutines.pl'}; require "MyRoutines.pl
+";};
[download]

Perl will look in %INC to see what has been 'used'. When it sees something is already in there, it will not re-use/require it. By deleting it, you can force it to re-require.

Cheers,
KM