MCE::Loop->init(
    max_workers => 2, chunk_size => 1, user_begin => sub {
        $SIG{'INT'} = sub {
            my $signal = shift;
            say "Hello from $signal: $$";
            MCE->exit(0);
        };
    },
    on_post_exit => sub {
        my ($mce, $e) = @_;
        if ($e->{status} == 255) {
            MCE::Signal::stop_and_exit('__DIE__');
        }
    }
);


##</code><code>##

local $SIG{__DIE__} = sub {

   ...

   local $SIG{__DIE__}; local $\ = undef;
   my $_die_msg = (defined $_[0]) ? $_[0] : '';
   print {*STDERR} $_die_msg;

   $self->exit(255, $_die_msg, $self->{_chunk_id});
};


##</code><code>##

eval { mce_loop { ... } @input };

# TODO: Today, $@ is not set at the manager level.
# Thus, the eval block succeeds. Will fix this.

if ( $@ ) {
    ...
}