From: Zhu Zihao <all_but_last@163.com>
To: "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>
Cc: guix-devel@gnu.org
Subject: Re: The Shepherd on Fibers
Date: Sat, 26 Mar 2022 19:27:00 +0800 [thread overview]
Message-ID: <861qypq79p.fsf@163.com> (raw)
In-Reply-To: <20220326111834.zwqeswbc7vrsl4bz@pelzflorian.localdomain>
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IIUC, After fork and execute the program, shepherd will wait for the pid
file to appear. This is a block operation.
Shepherd on Fiber make this operation non-blocking (because the pid file
is created by Linux kernel, Shepherd just need to wait for it), every
service activation runs on its own fiber. after fork+exec, shepherd
suspend current fiber, andspawn another fiber to start another service
immediately.
But finally all fibers are co-operatively scheduled on 1 thread.
"pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de> writes:
> On Sat, Mar 26, 2022 at 07:09:12PM +0800, Zhu Zihao wrote:
>> > So shepherd service authors still cannot write blocking code but need
>> > to yield?
>>
>> IMO, service should not block service, if they have something important
>> to do before running a program, why not fork first and do it in the
>> child-process (maybe wrap the actual startup program in Guile script)?
>
> In other words, all stays the same as without fibers?
>
> Regards,
> Florian
--
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Zihao
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next prev parent reply other threads:[~2022-03-26 11:32 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-23 22:36 The Shepherd on Fibers Ludovic Courtès
2022-03-25 13:29 ` Maxim Cournoyer
2022-03-26 21:28 ` Ludovic Courtès
2022-03-26 11:06 ` pelzflorian (Florian Pelz)
2022-03-26 11:09 ` Zhu Zihao
2022-03-26 11:16 ` Zhu Zihao
2022-03-26 11:18 ` pelzflorian (Florian Pelz)
2022-03-26 11:27 ` Zhu Zihao [this message]
2022-03-26 16:56 ` pelzflorian (Florian Pelz)
2022-03-26 11:59 ` Maxime Devos
2022-03-26 16:52 ` pelzflorian (Florian Pelz)
2022-03-26 18:20 ` Maxime Devos
2022-03-29 11:44 ` Ludovic Courtès
2022-03-26 12:03 ` Maxime Devos
2022-03-29 12:47 ` Ludovic Courtès
2022-03-26 12:11 ` Maxime Devos
2022-03-29 12:48 ` Ludovic Courtès
2022-03-29 16:26 ` Maxime Devos
2022-03-30 15:14 ` Ludovic Courtès
2022-03-30 17:16 ` Maxime Devos
2022-03-26 12:16 ` Maxime Devos
2022-03-29 12:50 ` Ludovic Courtès
2022-03-29 12:52 ` Maxime Devos
2022-03-29 12:54 ` Maxime Devos
2022-03-29 15:29 ` Attila Lendvai
2022-03-30 10:05 ` Ludovic Courtès
2022-03-31 4:33 ` adriano
2022-03-31 7:56 ` Attila Lendvai
2022-03-26 12:44 ` Maxime Devos
2022-03-29 13:03 ` Ludovic Courtès
2022-03-26 19:24 ` Maxime Devos
2022-03-29 0:14 ` Philip McGrath
2022-03-29 0:22 ` Philip McGrath
2022-03-29 9:36 ` Maxime Devos
2022-03-29 11:11 ` Philip McGrath
2022-03-30 10:00 ` Ludovic Courtès
2022-03-29 10:13 ` Zhu Zihao
2022-03-29 10:40 ` Maxime Devos
2022-03-30 9:49 ` Ludovic Courtès
2022-03-29 13:16 ` Ludovic Courtès
-- strict thread matches above, loose matches on Subject: below --
2022-03-24 6:48 Brendan Tildesley
2022-03-24 16:57 Nathan Dehnel
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