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Date: Fri, 7 Mar 2025 20:19:57 +0200
Message-ID: <CAMW7n8A7QeT_YgTjUWjbnujbsV=pKbszrMqhZrN=Ai_a+1ZnWg@mail.gmail.com>
Subject: Re: [PHP-DEV] PHP True Async RFC
To: Rob Landers <rob@bottled.codes>
Cc: internals@lists.php.net
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From: edmond.ht@gmail.com (Edmond Dantes)

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>
> A SAPI is written in C (or at least, using
> the C api's) and thus can do just about anything. If it wanted to, it
could swap out
> the global state when switching fibers.
>

Probably, it's possible. However, if I'm not mistaken, $_GET and $_POST are
implemented as regular PHP arrays, so if they need to be adapted, they
should be replaced with proxy objects.

>
>  So, at a minimum, I would guess the engine needs to provide hooks that
the SAPI can use to provide request contexts to the global state
>

Thus, the cost of coroutine switching increases. Coroutines can switch
between each other multiple times during a single SQL query. If there are
10-20 such queries, the total number of switches can reach hundreds. Using
the proxy pattern is the most common practice in this case.

>
> If fibers were to allow true concurrency, we would need many more
primitives.
>
You mean true parallelism. If that happens, all existing PHP frameworks,
libraries, and C extensions would have to be rewritten, sometimes almost
from scratch.  But it would most likely be a different language.

Ed.

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<div dir=3D"ltr">&gt;<br>&gt;=C2=A0<span style=3D"background-color:rgb(242,=
242,242);color:rgb(51,51,51);font-family:&quot;Fira Mono&quot;,monospace;fo=
nt-size:14px">A SAPI is written in C (or at least, using<br></span><span st=
yle=3D"background-color:rgb(242,242,242);color:rgb(51,51,51);font-family:&q=
uot;Fira Mono&quot;,monospace;font-size:14px">&gt; the C api&#39;s) and thu=
s can do just about anything. If it wanted to, it could swap out<br></span>=
<span style=3D"background-color:rgb(242,242,242);color:rgb(51,51,51);font-f=
amily:&quot;Fira Mono&quot;,monospace;font-size:14px">&gt; the global state=
 when switching fibers.</span><span style=3D"background-color:rgb(242,242,2=
42);color:rgb(51,51,51);font-family:&quot;Fira Mono&quot;,monospace;font-si=
ze:14px"><br></span>&gt;<br><br>Probably, it&#39;s possible. However, if I&=
#39;m not mistaken, <code>$_GET</code> and <code>$_POST</code> are implemen=
ted as regular PHP arrays, so if they need to be adapted, they should be re=
placed with proxy objects.=C2=A0=C2=A0<div><br></div><div>&gt;<br>&gt;=C2=
=A0

So, at a minimum, I would guess the engine needs to provide hooks that the =
SAPI can use to
provide request contexts to the global state

<br>&gt;<br><br>Thus, the cost of coroutine switching increases. Coroutines=
 can switch between each other multiple times during a single SQL query. If=
 there are 10-20 such queries, the total number of switches can reach hundr=
eds. Using the proxy pattern is the most common practice in this case.=C2=
=A0=C2=A0</div><div><br></div><div>&gt;<br>&gt;=C2=A0<span style=3D"backgro=
und-color:rgb(242,242,242);color:rgb(51,51,51);font-family:&quot;Fira Mono&=
quot;,monospace;font-size:14px">If fibers were to allow true concurrency, w=
e would need many more primitives.</span><br>&gt;</div><div>You mean true p=
arallelism. If that happens, all existing PHP frameworks, libraries, and C =
extensions would have to be rewritten, sometimes almost from scratch.=C2=A0

But it would most likely be a different language.</div><div><br></div><div>=
Ed.</div></div>

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