On Aug 14 12:53, Corinna Vinschen wrote:
> On Aug 14 06:28, Ken Brown wrote:
> > On 8/14/2013 5:16 AM, Corinna Vinschen wrote:
> > >On Aug 14 10:10, Corinna Vinschen wrote:
> > >>On Aug 13 18:00, Ken Brown wrote:
> > >>>On 8/13/2013 2:26 PM, Corinna Vinschen wrote:
> > >>>>What function is not implemented?  Is that something we can fix,
> > >>>>perhaps in the Cygwin DLL?
> > >>>
> > >>>It's memalign, or at least that's what it was in 2007.  See
> > >>>
> > >>>   http://cygwin.com/ml/cygwin/2007-02/msg00678.html
> > >>
> > >>So it's using its own malloc but we don't support overriding other
> > >>functions besides malloc/realloc/calloc/free.
> > >>
> > >>In theory we could do that in future.  We still have room for 10 (x86)
> > >>resp. 12 (x86_64) pointers in the per_process structure, which could be
> > >>used for this purpose.  This would only require applications which need
> > >>this feature to be rebuilt with the next Cygwin version providing these
> > >>pointers.
> > >
> > >More precisely, they have to be rebuild using crt0.o from the next
> > >Cygwin release, and they would have to run under the next Cygwin
> > >release.  If you omit one step, you're back to the current behaviour.
> > >
> > >>But we shouldn't waste those unused slots either, so the number of
> > >>overridable functions should be kept small.  In theory we have mallopt,
> > >>mallinfo, posix_memalign, memalign, and valloc.
> > >>
> > >>I guess we can skip mallopt and mallinfo since they are pretty
> > >>seldomly used in user-provided malloc implementations.
> > >>
> > >>Memalign is an old, deprecated function, so I wonder why it's used at
> > >>all.  GSlice should use posix_memalign instead.  Yaakov, is there an
> > >>option to use posix_memalign rather than memalign?
> > 
> > I just checked the glib source, and it does use posix_memalign if
> > it's available.  I was quoting a 2007 discussion when I said it was
> > memalign that GSlice wanted to use.
> 
> Given that, we should perhaps skip the memalign override.

On second (third? fourth?) thought, I think we should do this with
posix_memalign only.  valloc is just as obsolete as posix_memalign.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
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