Re: [Chicken-users] using mmap files as strings?

[Alaric Snell-Pym]

On 11/02/10 14:53, Felix wrote:
> From: Alaric Snell-Pym<address@hidden>
> Subject: Re: [Chicken-users] using mmap files as strings?
> Date: Tue, 02 Nov 2010 13:22:01 +0000
>
> > Then have blobs, strings, srfi-4 vectors, and friends all have the
> > option of being a reference to one of the above with an offset and
> > limit, so they can be views into arbitrary data from external sources.
>
> That's the problem: all primitives on those objects have to check
> whether they have to handle such a "view" object. Handling these
> special cases are too costly and prohibit optimizations.

*nod* that's the downside. I've been wondering how to address it.

One way would be to give every blobby object a small header with a data
pointer and offset in (the rest of it either containing the data, or a
reference to the real store of the data so it gets noticed by the GC, as
the raw pointer may be into the middle of it). This would make for a
double indirection to get to the data in every operation, but that would
be done just once for bulk operations written in raw C.

> cheers,
> felix

ABS

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Alaric Snell-Pym
http://www.snell-pym.org.uk/alaric/