From: Keith Owens <kaos@ocs.com.au>
To: linux-ia64@vger.kernel.org
Subject: Re: shared memory between 32bit & 64bit applications
Date: Tue, 04 May 2004 02:04:11 +0000 [thread overview]
Message-ID: <6869.1083636251@kao2.melbourne.sgi.com> (raw)
In-Reply-To: <20040503132511.GJ2281@parcelfarce.linux.theplanet.co.uk>
On Mon, 3 May 2004 14:25:11 +0100,
Matthew Wilcox <willy@debian.org> wrote:
>Nope. You're being bitten by different struct padding rules.
>
>#include <stdio.h>
>
>struct foo {
> int req;
> long long id;
> int abc;
>};
>
>int main(void) { return printf("%d\n", sizeof(struct foo)); }
>
>On ia64, this prints 24; on i386 it prints 16.
>
>You could declare it __attribute__((packed)) or you could reorder the
>elements in the struct to put the largest elements first.
Or compile i386 code with -malign-double which will align i386 long
long values on 8 byte boundaries, the same as ia64.
prev parent reply other threads:[~2004-05-04 2:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-03 13:25 shared memory between 32bit & 64bit applications Matthew Wilcox
2004-05-03 13:28 ` ARADHYA, CHINMAYA TM (STSD)
2004-05-03 15:07 ` Grant Grundler
2004-05-04 2:04 ` Keith Owens [this message]
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