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Re: Does malloc tell us anything about alignment modulo k?

From: Arnaud Charlet <charlet at ACT-Europe dot FR>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: Geert Bosch <bosch at gnat dot com>, gcc at gcc dot gnu dot org,Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, law at redhat dot com
Date: Thu, 15 Jul 2004 20:14:08 +0200
Subject: Re: Does malloc tell us anything about alignment modulo k?
References: <10407151454.AA03178@vlsi1.ultra.nyu.edu> <20040715124315.GC30497@sunsite.ms.mff.cuni.cz> <E73063DF-D67F-11D8-B2BE-000A959A128E@gnat.com> <20040715145041.GD30497@sunsite.ms.mff.cuni.cz>

> POSIX requires posix_memalign to be freeable by free() and I doubt anybody
> implements function posix_memalign which doesn't have POSIX semantics.
> In glibc, posix_memalign is a wrapper around memalign, so glibc memalign
> can be freed by free() too.

All of this is very specific to glibc and/or gnu/linux.

AFAIK, not many systems implement posix_memalign today: doing a man
posix_memalign on Solaris 9 or HP-UX 11.11 yields no answer for instance,
and these are recent OSes, I am not even mentioning older OSes (nor
Windows...)

FWIW, this is causing GNAT lots of troubles (that GCC's maximum alignment
is bigger than what malloc guarantees).

Arno

References:
- Re: Does malloc tell us anything about alignment modulo k?
  - From: Richard Kenner
- Re: Does malloc tell us anything about alignment modulo k?
  - From: Jakub Jelinek
- Re: Does malloc tell us anything about alignment modulo k?
  - From: Geert Bosch
- Re: Does malloc tell us anything about alignment modulo k?
  - From: Jakub Jelinek

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