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Date: Sat, 22 Nov 2025 15:40:26 +0100 (CET)
To: Edmond Dantes <edmond.ht@gmail.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] [VOTE] True Async RFC 1.6
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From: mails@thomasbley.de (Thomas Bley)


> Edmond Dantes <edmond.ht@gmail.com> hat am 22.11.2025 14:55 CET geschrieb=
en:
>=20
> =20
> > So I guess you want to use spawn() in a similar way as call_user_func()=
 works.
> yes
>=20
> > This changes the behavior of file_get_contents() from the outside
> No.
>=20
> ```php
> function file_get_contents(string $filename): string
> {
>     $fh =3D fopen();
>=20
>     // It creates an EPOLL event so it can wake us when the data
> becomes available.
>      $event =3D ReactorAPI.create_event_from($fh);
>     $waker =3D Scheduler.getCurrentWaker();
>     // Event Driven logic inside.
>     $waker.add_event($event, function() use($waker) {
>           // Wakeup this coroutine
>           $waker.wake();
>      });
>=20
>     // suspend current coroutine
>     // zz..... z.....
>     Scheduler.suspend();
>=20
>     // Continue here after the IO event
>=20
>     // Now we have date, return
>     return fread($fh, ....);
> }
> ```
>=20
> This is pseudocode. You can assume it always works.
> If you call `file_get_contents` directly, it behaves the same way.
> So it does not matter where `file_get_contents` is called.
> Since all PHP code together with TrueAsync runs inside coroutines,
> `file_get_contents` will suspend the coroutine in which it was invoked.
>=20
> When you call `spawn`, you simply run the function in another
> coroutine, not in your own. But `spawn` has no effect on
> `file_get_contents`.
>=20
> We=E2=80=99re not at risk of DataRace yet :) We don=E2=80=99t have multit=
hreading.
> And most likely it won=E2=80=99t appear anytime soon.


>     // Continue here after the IO event

From my understanding, the code does not continue if there is no io event? =
Will it use default_socket_timeout from php.ini and/or use the timeout spec=
ified in the stream context?

Can I mix sync IO and async IO in one function? e.g. if the server uses a m=
ixed storage of SSDs and HDDs and I only want async io for the SSDs?

Best Regards
Thomas