Here is what I have after implementing the above suggestion. I have a couple of questions:

• Why, when chunk_size is set to `1`, is the same process reused ?
• Why, when the interrupt is given, is nothing inside the SIG handlers being executed?
• What is the purpose of emptying the hash in the INT signal handler?

Full SSCCE:

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

my $pid = $$; say "PID $pid";

tie my %hash, 'MCE::Shared', ();

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', M
+CE->wid, MCE->pid, $chunk_id;
    for ( @{ $chunk_ref } ) {
        $hash{ sprintf '%.2d %s', $_, $$ } = time;
        say "After $_: " . Dumper \%hash;
        sleep 1;
    }
} ( 0 .. 4 );

MCE::Loop->finish;

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

        say 'Dumping: ' . Dumper \%hash;
        %hash = ();
    }
    MCE::Signal::stop_and_exit('INT');
};

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

END {
    say sprintf '%s %s (%s) in END', $$, time, $$ == $pid ? 'Parent' :
+ 'Child';
    if ( MCE->wid == 0 or $$ == $pid ) {
        say "Parent is ready to dump";
        say 'Dumping: ' . Dumper \%hash;
    }
}

__END__
[download]

Output when interrupted:

PID 21106
Forked worker in slot 2 with pid 21110 for chunk 1
Forked worker in slot 1 with pid 21109 for chunk 2
After 0: $VAR1 = {
          '00 21110' => '1491574316',
          '01 21109' => '1491574316'
        };

After 1: $VAR1 = {
          '00 21110' => '1491574316',
          '01 21109' => '1491574316'
        };

^C
## mce3.pl: caught signal (INT), exiting

Killed
[download]

Output without interrupt:

PID 20939
Forked worker in slot 2 with pid 20942 for chunk 1
Forked worker in slot 1 with pid 20941 for chunk 2
After 0: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178'
        };

After 1: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178'
        };

Forked worker in slot 2 with pid 20942 for chunk 3
Forked worker in slot 1 with pid 20941 for chunk 4
After 2: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178',
          '02 20942' => '1491574179',
          '03 20941' => '1491574179'
        };
After 3: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178',
          '02 20942' => '1491574179',
          '03 20941' => '1491574179'
        };


Forked worker in slot 2 with pid 20942 for chunk 5
After 4: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178',
          '02 20942' => '1491574179',
          '03 20941' => '1491574179',
          '04 20942' => '1491574180'
        };

20941 1491574181 (Child) in END
20942 1491574181 (Child) in END
20939 1491574181 (Parent) in END
Parent is ready to dump
Dumping: $VAR1 = {
          '00 20942' => '1491574178',
          '01 20941' => '1491574178',
          '02 20942' => '1491574179',
          '03 20941' => '1491574179',
          '04 20942' => '1491574180'
        };
[download]

Thanks again for your help.

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