use strict; use warnings; use feature 'say';
use Data::Dumper; ++$Data::Dumper::Sortkeys;
use MCE::Shared;
use MCE::Loop;
$|++;

my $pid = $$; say "PID $pid";
my $hash = MCE::Shared->hash();

$SIG{'INT'} = sub {
    my $signal = shift; $SIG{'INT'} = $SIG{'TERM'} = sub { };
    say "Hello from $signal: $$";
    if ( $hash->len ) {
        ( MCE->wid == 0 ) ? say 'Parent is ready to dump'
                          : say 'Worker is ready to dump';

        say 'Dumping: ' . Dumper $hash->export;
        $hash->clear;
    }

    MCE::Signal::stop_and_exit($signal);
};

$SIG{'TERM'} = sub {
    my $signal = shift; $SIG{'INT'} = $SIG{'TERM'} = sub { };
    say "Hello from $signal: $$";
    if (MCE->wid) { # worker
        MCE->exit(0);
    } else { # parent
        say 'Parent is ready to dump';
        say 'Dumping: ' . Dumper $hash->export;
        MCE::Signal::stop_and_exit($signal);
    }
};

MCE::Loop->init( max_workers => 2, chunk_size => 1 );

mce_loop {
    my ( $mce, $chunk_ref, $chunk_id ) = @_;
    say sprintf 'Forked worker in slot %s with pid %s for chunk %s', MCE->wid, MCE->pid, $chunk_id;
    for ( @{ $chunk_ref } ) {
        $hash->{ sprintf '%.2d %s', $_, $$ } = time;
        say "After $_: " . Dumper $hash->export;
        sleep 3;
    }
} ( 0 .. 12 );

MCE::Loop->finish;

say "Parent is ready to dump";
say 'Dumping: ' . Dumper $hash->export;