Example code not working with ExtEventLoop #34

<?php
require __DIR__ . '/vendor/autoload.php';
$stdoutLogFile = 'test.log';
/*
This works fine - it's writing to my log file
*/
$loop = new \React\EventLoop\StreamSelectLoop();
/*
Nothing gets written to the log file
Also, when starting this up, I get a notice & warning:
PHP Notice:  Event::add(): Epoll ADD(1) on fd 9 failed.  Old events were 0; read change was 1 (add); write change was 0 (none): Operation not permitted in vendor/react/event-loop/ExtEventLoop.php on line 258
PHP Warning:  Event::add(): Failed adding event in vendor/react/event-loop/ExtEventLoop.php on line 258
My Actual script doesn't have this warning, as it pipes from a Process stdout to the Stream. It still has the same problem though (not writing to the file)
*/
$loop = new \React\EventLoop\ExtEventLoop();
$stdout = new React\Stream\Stream(fopen($stdoutLogFile, 'a'), $loop);
$stdout->on(
    'error',
    function ($error) {
        var_dump($error);
    }
);
$loop->addPeriodicTimer(
    1,
    function (React\EventLoop\Timer\TimerInterface $timer) use ($stdout) {
        $stdout->write('Starting...');
    }
);
$loop->run();