Date: Tue, 03 Oct 2000 09:28:39 -0600 From: Chuck Paterson <cp@bsdi.com> To: John Baldwin <jhb@freebsd.org> Cc: Alfred Perlstein <bright@wintelcom.net>, arch@freebsd.org, John Polstra <jdp@polstra.com>, Daniel Eischen <eischen@vigrid.com>, Matt Dillon <dillon@earth.backplane.com>, Greg Lehey <grog@lemis.com> Subject: Re: Mutexes and semaphores Message-ID: <200010031528.JAA10873@berserker.bsdi.com> In-Reply-To: Your message of "Tue, 03 Oct 2000 01:04:02 PDT." <XFMail.001003010402.jhb@FreeBSD.org>
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Why do yo need a barier for getpid()?
A barrier really is not guaranteed to be sufficient
for the
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
p->p_retval[1] = p->p_pptr->p_pid;
#endif
case.
Chuck
----- Begin Included Message -----
Date: Tue, 03 Oct 2000 01:04:02 -0700
From: John Baldwin <jhb@FreeBSD.ORG>
To: Alfred Perlstein <bright@wintelcom.net>
Subject: Re: Mutexes and semaphores
cc: arch@FreeBSD.ORG, John Polstra <jdp@polstra.com>,
Daniel Eischen <eischen@vigrid.com>,
Matt Dillon <dillon@earth.backplane.com>, Greg Lehey <grog@lemis.com>
On 27-Sep-00 Alfred Perlstein wrote:
> Right now I can't even do getpid() properly because we don't have
> read/write-barriers.
We do have these. I have some helper functions I'll try to run by the
new-bus list tonight.
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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