From owner-freebsd-hackers  Tue Jan 28 23:28:53 2003
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id C7FD737B401
	for <freebsd-hackers@freebsd.org>; Tue, 28 Jan 2003 23:28:52 -0800 (PST)
Received: from istanbul.enderunix.org (istanbul.enderunix.org [212.65.128.82])
	by mx1.FreeBSD.org (Postfix) with SMTP id 3139A43F43
	for <freebsd-hackers@freebsd.org>; Tue, 28 Jan 2003 23:28:51 -0800 (PST)
	(envelope-from murat@enderunix.org)
Received: (qmail 86318 invoked by uid 1001); 29 Jan 2003 07:27:14 -0000
Date: Wed, 29 Jan 2003 09:27:14 +0200
From: Murat Balaban <murat@enderunix.org>
To: freebsd-hackers@freebsd.org
Subject: memcpy and multithreading
Message-ID: <20030129092714.A86300@enderunix.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG


Hi,

Are there any issues that i should now about memcpy and multithreading in FreeBSD?
I've got a code which reads:

        memcpy(&(h.req), req, sizeof(struct request));

and I keep getting SIGSEGV there in FreeBSD but not in Linux. 

PS: Of course, I protect the write operation with a mutex.
PS2: 
typedef struct hist_data {
        struct request req;
        int nthreads;
        int bwritten;
        struct thread_data wthread[MAXTHREADS];
} hist_data;


- Murat Balaban

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message