#!/usr/bin/perl
use strict;
use warnings;
use Parallel::ForkManager;

use constant MAX_PROCS => 1;
use constant MAX_TIME  => 10;

my ($pid, $ident, $start);
my $pm = new Parallel::ForkManager( MAX_PROCS );

@SIG{ qw(ABRT STOP TERM INT) } = (sub { kill 9, $pid; exit }) x 4;

$pm->run_on_start (
    sub {
        ($pid, $ident)= @_;
        $start = time;
        print "$ident started at ", scalar localtime($start), " with pid: $pid\n";
    }
);

$pm->run_on_wait (
    sub {
        if ( time - $start > MAX_TIME ) {
            print "Killing $pid - taking too long to run\n";
            kill 9, $pid;
        }
    },
    1
);

$pm->run_on_finish (
    sub {
        ($pid, my $exit_code, $ident) = @_;
        print "$ident ($pid) just completed with : $exit_code\n";
    }
);

while ( 1 ) {
    $pid = $pm->start( 'health check' ) and next;

    # We are in child  process
    for ( 1 .. rand 15 ) {
        print "I am the child doing work\n";
        sleep 1;

    }

    $pm->finish;
    # We are in parent process
}