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Re: Guile bugs

From: Marko Rauhamaa
Subject: Re: Guile bugs
Date: Thu, 20 Jul 2017 21:35:09 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

address@hidden (Taylan Ulrich "Bayırlı/Kammer"):

> Marko Rauhamaa <address@hidden> writes:
>> address@hidden (Ludovic Courtès):
>>> I’m very skeptical about this use case (I’d use ‘mmap’ and get a
>>> bytevector.)
>> Please elaborate.
>>  1. Does Guile offer mmap to Scheme code?
> It's pretty easy to call C functions from Scheme.

Not good enough. I would have to precompile libraries for different
target platforms (or require the target environment to have a C
compiler). Besides, the need is quite generic and shouldn't require an

>>  2. What would prevent Guile's GC from scanning the mmapped area for
>>     pointers?
> I don't know the details but AFAIK this is no problem with Boehm GC.

I don't understand. It can be quite time-consuming to scan gigabytes of
RAM for pointers.

>>  3. How do I efficiently encode information in a bytevector in Scheme
>>     code?
> What sort of data?
> I have a library called bytestructures that imitates the C type system
> within Scheme, to be used on bytevectors that contain data structures
> generated by C code, though the library is built upon a generic core
> with which other structures can be declared as well.  Not sure if this
> helps you:

That's precisely it. It would be nice to have it as part of standard

I wonder, though, if doing that is fast enough in Scheme code.


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