async hack

async.php

<?hh
type SomeResult = shape('property' => int);

function doIoBoundThing(): void {
    $nums = array(
        100000000,
        1000000000,
    );
    foreach ($nums as $num) {
        $i = 0;
        while(++$i < $num) {
            //such iteration
        }
    }
    return shape('property' => 100000);
}

async function async_io(): Awaitable<int> {
    print "Starting IO bound thing\n";
    $result = doIoBoundThing();
    await RescheduleWaitHandle::create(1,1);
    print "Returning IO result\n";
    return $result['property'];
}


async function async_main(): Awaitable<void> {
    $handles = [];
    for ($i = 0; $i < 5; $i++) {
              $handles[] = async_io();
    }
    $x = await GenArrayWaitHandle::create($handles);
    print count($x);
    print "\n\n";
}

async_main()->join();