#!/usr/bin/env perl

use v5.16.3;
use threads (exit => 'threads_only');
use threads::shared;
use IO::Select();
use FCGI;

my $listen = ':5000';

my $socket = FCGI::OpenSocket($listen, 100);

$SIG{INT} = sub {
    map { $_->kill('TERM') } threads->list(threads::all);
};

threads->create(\&thread, $socket);
threads->create(\&thread, $socket);
threads->create(\&thread, $socket);

while (threads->list(threads::all)) { sleep 1 }    #wait until all threads finished

sub thread {
    my $socket = shift;

    $SIG{TERM} = sub {
        threads->detach;
        threads->exit;
    };

    my $env = {};
    my $req = FCGI::Request(\*STDIN, \*STDOUT, \*STDERR, $env, $socket, 1);
    my $sel = IO::Select->new($socket);
    while (1) {
        if ($sel->can_read(1) && $req->Accept() >= 0) {
            print "200\x0D\x0A";
			print "Content-Type: text/plain\x0D\x0A";
			print "\x0D\x0A";
			print threads->tid . "\x0D\x0A";
            $req->Finish;
        }
    }

    return;
}