async: await() error in SimpleFiber.php

(Great job with Fibers initiative!) For test purposes I’m refactoring my app with await() function in place of promises-chains. I’ve got an error:

2021-11-29 21:56:23 [EXCEPTION] Error: Value of type null is not callable in ...\vendor\react\async\src\SimpleFiber.php:59
2021-11-29 21:56:23 [EXCEPTION] #0 ...\vendor\react\async\src\functions.php(92): React\Async\SimpleFiber->suspend()
2021-11-29 21:56:23 [EXCEPTION] #1 ...\MessagesProcessor.php(114): React\Async\await(Object(React\Promise\Promise))

It occurs when I try to use async() function. It’s hard to say how to reproduce this bug. In the same call stack, a few promises before, I use a React\Http\Browser with async() function. If I comment this usage (replace to something like resolve(new ResultObject())) - error doesn’t occur. If I use Browser with promise-style api, the PHP process ends with error:

Process finished with exit code -1073741819 (0xC0000005)

I’m using the newest versions of all packages, ofc PHP 8.1. Do you know what can cause these errors?

About this issue

Original URL
State: closed
Created 3 years ago
Comments: 17 (8 by maintainers)

Most upvoted comments

A valid reason I can think of to call await in the main fiber is to determine the exit code of the application. Note that the order of things added to the event loop is important as described in @WyriHaximus’s blog.

<?php

use React\EventLoop\Loop;

use function React\Async\async;
use function React\Async\await;

require_once __DIR__ . '/vendor/autoload.php';

$timer = Loop::addPeriodicTimer(1, fn() => print 'tick' . PHP_EOL);

$exit = await(async(function () use ($timer) {
    Loop::addTimer(10, fn() => Loop::cancelTimer($timer));
    return 1;
}));

exit($exit);

bartvanhoutte on Dec 15, 2021

Need to translate this into documentation, but write my thoughts and the outlines of our current plan down at: https://blog.wyrihaximus.net/2021/12/async-and-await-at-the-edge-with-reactphp/

WyriHaximus on Dec 14, 2021

@bartvanhoutte yes, each async will create a new fiber.

WyriHaximus on Dec 9, 2021