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To: Mike Schinkel <mike@newclarity.net>, Aaron Piotrowski <aaron@trowski.com>
CC: php internals <internals@lists.php.net>
Thread-Topic: [PHP-DEV] [RFC] Fibers
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Date: Mon, 21 Dec 2020 23:59:23 +0000
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Subject: Re: [PHP-DEV] [RFC] Fibers
From: tysonandre775@hotmail.com (tyson andre)

Hi Mike Schinkel,=0A=
=0A=
>=A0This is interesting, and potentially very useful.=0A=
>=A0=0A=
> I am curious about how you propose access to shared memory across fibers?=
=A0 What will happen if two fibers try to update a $GLOBALS variable at the=
 same time?=A0 Or a property of the same object?=A0 How will developers man=
age that?=0A=
=0A=
(I started writing this before Aaron sent a different response)=0A=
=0A=
[Concurrency is not parallelism](text of https://blog.golang.org/waza-talk =
, not the video),=0A=
and this RFC isn't adding parallelism to php.=0A=
Instead, the RFC is a proposal to make concurrency easier.=0A=
The rfc announcement email says that "fibers exist within a single thread".=
=0A=
A fiber would have to explicitly release control to the scheduler after mod=
ifying a $GLOBALS variable, etc.=0A=
=0A=
As I understand it, this proposal is similar to how concurrency works in no=
de for code written in JS - https://stackoverflow.com/questions/29977049/ho=
w-does-concurrency-work-in-nodejs=0A=
(in that there's only one thread, but it's different in that scheduling is =
done manually)=0A=
=0A=
Thanks,=0A=
- Tyson=