From: Maxime Devos <maximedevos@telenet.be>
To: guile-user@gnu.org, Tomas Volf <wolf@wolfsden.cz>
Subject: Re: How to globally replace core binding?
Date: Tue, 28 Nov 2023 02:57:27 +0100 [thread overview]
Message-ID: <b0eff3f0-234b-f3a8-a918-426383e81683@telenet.be> (raw)
In-Reply-To: <ZWVES6Sbj9Co_veg@ws>
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> [...]
> It looks like it is defined inside libguile/filesys.c, so that is not an option.
> And I would like to avoid patching the Guile itself anyway.
In that case, this part is N/A.
>> That way, Guile's compiler/optimizer knows that the binding is mutable and
>> should not inlined (well, Guile being Guile, every binding is mutable, but
>> now it is mutable from the perspective of the inliner too).
> Interesting, is there a way to do the same hint from the C code? Would there be
> a reason? I assume C code cannot be inlined anyway, so there is no need?
It would theoretically be possible to implement cross C<->Scheme
inlining, but given that no such inlining exists currently, there is no
method for declaring ‘don't inline’ and no need.
>> Depending on whether 'copy-file' is just a stand-in for something else and
>> depending on how the better copy-file works/how it is ‘better’, it might be
>> better to eventually write a patch to replace copy-file with the improved
>> better-file, as then the improved copy-file is more widely available. (As a
>> long-term thing; for short-term ‘trying things out’, doing set! is much more
>> practical.)
> What I want to do is to replace (copy-file oldfile newfile) by modified version
> with signature (copy-file oldfile newfile [reflink]) with reflink defaulting to
> 'auto (see man cp for details).
>
> I expect this to be a somewhat controversial change, so I did not intend to send
> a patch, however I can, if you think it has a chance of getting merged.
>
> Tomas
An extra reflink argument seems fine to me, though I would use a keyword
argument #:copy-on-write instead -- a bit more flexible towards
potential future API additions (#:sparse? #true #:user [UID] #:group
[GID] #:mode [...] ...).
Worst case, someone disagrees that 'auto' should be the default, but
merely adding the _option_ to copy-on-write would be uncontroversial, I
think.
Best regards,
MAxime Devos.
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prev parent reply other threads:[~2023-11-28 1:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-26 17:42 How to globally replace core binding? Tomas Volf
2023-11-28 0:51 ` Maxime Devos
2023-11-28 1:37 ` Tomas Volf
2023-11-28 1:57 ` Maxime Devos [this message]
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