# Perl replica of using a Barrier with a Timeout
# https://superfastpython.com/multiprocessing-barrier-in-python/

use MCE::Simple -strict, -signatures;
use MCE::Barrier;
use Time::HiRes 'sleep';
use Try::Tiny;

STDOUT->autoflush(1);

sub task ($barrier, $number) {
    # generate a unique value and block for a moment
    my $value = rand() * 10; sleep($value);

    # report result
    say "Process ${number} done, got: ${value}";

    # wait on all other processes to complete
    # my ($remaining, $error) = $barrier->wait;
    # or via exception handling
    try {
        $barrier->wait;
    }
    catch {
        # pass
    };
}

sub main () {
    # create a barrier plus one for the main process
    my $barrier = MCE::Barrier->new(5 + 1);

    # create the worker processes
    spawn task($barrier, $_) for 1..5;

    # wait for all processes to finish
    # my ($remaining, $error) = $barrier->wait;
    # or via exception handling
    try {
        $barrier->wait(timeout => 5);
        say "All processes have their result";
    }
    catch {
        # $_ = "Operation timed out ..."
        say "Some processes did not finish on time...";
    };

    # reap the worker processes
    sync;
}

main();

__END__
Process 2 done, got: 2.20488202831806
Process 1 done, got: 4.51354761681618
Some processes did not finish on time...
Process 5 done, got: 5.27888526282371
Process 4 done, got: 7.58755085132183
Process 3 done, got: 9.89621643981994