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

[Kon Lovett]

On Oct 27, 2010, at 9:45 AM, Jörg F. Wittenberger wrote:

<snip>
> > Not completely. Chicken library code uses sys namespace routines &
> > cached bindings for many string operations. Hooking the Chicken
> string
> > representation in a routine by routine fashion will probably be
> brittle.
> >
>
> I recently noticed that several of the ##sys# prefixes have been
> eliminated recently (elsewhere in the code).

?.

> Also I must ask here: do those namespaces have any special effect
> besides a new symbol table entry?

From the standpoint of replacing a global binding, no.

>  If not (and that's what my
> observations indicate) it should be possible to just overwrite the
> bindings.  At worst it might be a case of making sure the overwrite
> happens early enough, at least before the caching.

That would need to be very early indeed:

(define string-operation
  (let ((strop1 strop1)
        (strop2 strop2) )
    ... code using stropN ... ) )

is a very common idiom.

> ...or early enough with some help by our friendly chicken.
>
> I mean: some Scheme compiler(s) allow call/cc only with a command line
> switch.  Why should chicken not get yet another one, enabling shared
> substrings (which would mean to use half way replaced string  
> handling).
> I would contribute on that one.

Requires changes to chicken.h & runtime.c plus probably there are some  
assumptions about memory layout scattered about.

>
<snip>

Best Wishes,
Kon