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Re: Question about an error with ports
From: |
Olivier Dion |
Subject: |
Re: Question about an error with ports |
Date: |
Fri, 11 Mar 2022 10:06:09 -0500 |
On Fri, 11 Mar 2022, Maxime Devos <maximedevos@telenet.be> wrote:
> Olivier Dion via General Guile related discussions schreef op do 10-03-
> 2022 om 18:46 [-0500]:
>> I haven't check the implementation details, but I think it's just a
>> question of buffering. `get-bytevector-n` will block just like
>> `get-bytevector-some` when the port is empty. The former will return up
>> to N bytes and the latter might return more than N bytes.
>
> I don't think that get-bytevector-some can return more, and it could
> return less:
>
> Return either [...] or a new bytevector containing some of the
> available bytes (at least one),
More or less is relative to the N value compared with get-bytevector-n.
So realy the `some` value is unknown. You just know you will have at
least a byte yes.
> Also, gnunet-scheme depends on the behaviour of it (*) being able to
> return less without blocking (in gnu/gnunet/utils/tokeniser.scm). If
> the behaviour was different, there would have been many test failures.
>
> (*) actually, it uses the variant 'get-bytevector-some!' instead of
> 'get-bytevector-some'.
Re-using the same vector would certainly reduce memory
usage/fragmentation I suppose. Internally, the latter use the former I
think.
Regards,
old
--
Olivier Dion
Polymtl
- Re: Question about an error with ports, (continued)
- Re: Question about an error with ports, Chris Vine, 2022/03/11
- Re: Question about an error with ports, Olivier Dion, 2022/03/11
- Re: Question about an error with ports, Chris Vine, 2022/03/11
- Re: Question about an error with ports, Olivier Dion, 2022/03/11
- Re: Question about an error with ports, Chris Vine, 2022/03/11
- Re: Question about an error with ports, Maxime Devos, 2022/03/11
- Re: Question about an error with ports, Maxime Devos, 2022/03/11
- Re: Question about an error with ports, Chris Vine, 2022/03/11
- Re: Question about an error with ports, Chris Vine, 2022/03/11
- Re: Question about an error with ports, Maxime Devos, 2022/03/11
- Re: Question about an error with ports,
Olivier Dion <=