[Rd] Memory management issues
wavexx at users.sf.net
Mon Jul 6 00:05:18 CEST 2009
In article <4A5102FF.8040303 at stats.uwo.ca>,
Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
> > What I'd would like to do is:
> > - "patch" the SEXP returned to R so that DATAPTR() points directly to
> > the required address.
> The normal way to do what you want is to use an "external pointer". R
> assumes that memory management for those is handled completely
> externally. External pointers can have finalizers, so when you no
> longer have a need for the object, you can ask the external library to
> release it.
I don't think external pointers can be read from R sources like normal
vectors, or am I wrong?
Using external pointers would imply either proxy calls for every action
you need to perform or deep copies (like I'm doing now).
> I wouldn't try to trick the memory manager into thinking that it
> allocated these things; that will likely just lead to problems.
I'm not afraid of patching R sources somehow, if that's the only
solution, but it's one that I would like to avoid.
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