Re: [Chicken-users] binary data

[Kon Lovett]

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On Sep 12, 2006, at 12:01 PM, john wrote:

> Thanks guys for the responses.
>
> Another related question...
>
> If I allocate memory in Chicken using a byte-vector and pass this over
> to C, what happens if the C code consumes the memory and does a
> realloc on its pointer?

Probably a SEGV at some point, after who knows how much damage is done.

realloc might free, then malloc, when it cannot grow the existing  
memory allocation in place. This would change the assumptions Chicken  
makes about managed objects in its' heap; i.e. existing references to  
this byte-vector would point to free'ed memory!

I think Felix suggested the use of unmanaged memory for this kind of  
thing.

> I am guessing Chicken (byte-vector-length)
> would just not know about any extra bytes created but I could still
> call file-write on the byte-vector with the new byte size if I obtain
> it from C?

Much worse then "just not know."

> Cheers,
>
> John.
>
>
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> http://lists.nongnu.org/mailman/listinfo/chicken-users

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iEYEARECAAYFAkUHC+IACgkQJJNoeGe+5O4aGACfYpdKiantOmeF7Y52Ogk1UMJE
hzgAnRhCl6BrdoQlZ8LGoQ51MxyQPsFx
=sUns
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