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Date: Sat, 9 Sep 2017 12:31:25 +0200
Message-ID: <CANUQDChFqHmDOCRNEpUj5zn4veizfsR7s8JKOkUo4OYUDiwKng@mail.gmail.com>
To: Haitao Lv <i@lvht.net>
Cc: Rowan Collins <rowan.collins@gmail.com>, PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="94eb2c0794701b58400558bf326b"
Subject: Re: [PHP-DEV] add Fiber (sackful coroutine) support
From: me@kelunik.com (Niklas Keller)

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2017-09-09 8:07 GMT+02:00 Haitao Lv <i@lvht.net>:

>
> > On 1 Sep 2017, at 22:25, Niklas Keller <me@kelunik.com> wrote:
> >
> > A potential way around that (might be a stupid idea I just had): Allow
> > defining "wrappers" per file, that auto-wrap marked functions.
>
> Amp need these wrapper functions because we cannot yield a generator from
> its sub function call. So if we introduce fiber, these wrapper is needless.


We could easily support yielding generators and auto-wrapping them in the
coroutine implementation, but not every generator is a coroutine. And
generators are an implementation detail, it doesn't make sense to force
everything to be a generator.


>
> >
> > I don't see an event loop or promises being built-in soon, but something
> > like that could provide `async` with userland magic. Not the best thing,
> > but maybe better than preprocessing, don't know.
>
> Fiber is asymmetric coroutine, and the PHP kernel has no duty to schedule
> them. So a built-in event loop is no needed.


I'm actually thinking about bringing our promise + coroutine implementation
to php-src. `await` could be used to automatically convert generators into
coroutines, which implement promise. It would be mostly syntactic sugar for
the current Amp implementation, because all these wrappers are gone, but
the implementation details of something being a coroutine stays hidden
behind a promise interface.

Regards, Niklas

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