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Date: Tue, 18 Feb 2025 13:23:40 +0100
To: "Edmond Dantes" <edmond.ht@gmail.com>, Bilge <bilge@scriptfusion.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] PHP True Async
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From: rob@bottled.codes ("Rob Landers")

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On Mon, Feb 17, 2025, at 20:31, Edmond Dantes wrote:
> >  There should be no perceptible difference between a blocking sleep(=
10) and an async sleep(10), so what backwards compatibility are you refe=
rring to?
>=20
> For example, the behavior of the code below will not change. The code =
will execute sequentially, and context switching will only occur when `r=
esume`/`suspend` is called.
>=20
> However, when the `Scheduler` is activated, this behavior changes. Now=
, calling `sleep()` inside a `Fiber` will lead to a context switch.
>=20
> If the activation of the `Scheduler` is implicit, previously written c=
ode may not work as the developer expects.
>=20
>=20
> <?php
>=20
> $fiber =3D new Fiber(function (): void {
>     echo "Start fiber\n";
>     sleep(1);
>     Fiber::suspend("Paused");
>     echo "Resume fiber\n";
> });
>=20
> $result =3D $fiber->start();
>=20
> echo "Fiber suspended with: $result\n";
>=20
> sleep(10);
>=20
> $fiber->resume();
>=20
> echo "Fiber finished\n";

I think what bilge was trying to point out is that there should be absol=
utely no change on existing software with or without the scheduler runni=
ng (for software not using fibers).

=E2=80=94 Rob
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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">p.Mso=
Normal,p.MsoNoSpacing{margin:0}</style></head><body><div><br></div><div>=
<br></div><div>On Mon, Feb 17, 2025, at 20:31, Edmond Dantes wrote:<br><=
/div><blockquote type=3D"cite" id=3D"qt" style=3D""><div dir=3D"ltr"><di=
v dir=3D"ltr"><div>&gt;&nbsp;=0A=0AThere should be no perceptible differ=
ence between a blocking sleep(10) and an async sleep(10), so what backwa=
rds compatibility are you referring to?<br></div><div><br></div><div><p>=
For example, the behavior of the code below will not change. The code wi=
ll execute sequentially, and context switching will only occur when <cod=
e>resume</code>/<code>suspend</code> is called.<br></p><p>However, when =
the <code>Scheduler</code> is activated, this behavior changes. Now, cal=
ling <code>sleep()</code> inside a <code>Fiber</code> will lead to a con=
text switch.<br></p><p>If the activation of the <code>Scheduler</code> i=
s implicit, previously written code may not work as the developer expect=
s.<br></p></div><div><br></div><div><div>&lt;?php<br></div><div><br></di=
v><div>$fiber =3D new Fiber(function (): void {<br></div><div>&nbsp; &nb=
sp; echo "Start fiber\n";<br></div></div><div><div>&nbsp; &nbsp; sleep(1=
);<br></div><div>&nbsp; &nbsp; Fiber::suspend("Paused");<br></div><div>&=
nbsp; &nbsp; echo "Resume fiber\n";<br></div><div>});<br></div><div><br>=
</div><div>$result =3D $fiber-&gt;start();<br></div><div><br></div><div>=
echo "Fiber suspended with: $result\n";<br></div></div><div><br></div><d=
iv><div>sleep(10);<br></div><div><br></div><div>$fiber-&gt;resume();<br>=
</div><div><br></div><div>echo "Fiber finished\n";<br></div></div></div>=
</div></blockquote><div><br></div><div>I think what bilge was trying to =
point out is that there should be absolutely no change on existing softw=
are with or without the scheduler running (for software not using fibers=
).</div><div><br></div><div id=3D"sig121229152">=E2=80=94 Rob<br></div><=
/body></html>
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