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From: Terry Lambert <tlambert@primenet.com>
Message-Id: <199809202157.OAA02854@usr04.primenet.com>
Subject: Re: pthreads and sync writes
To: bde@zeta.org.au (Bruce Evans)
Date: Sun, 20 Sep 1998 21:57:00 +0000 (GMT)
Cc: freebsd-current@FreeBSD.ORG, mal@algonet.se
In-Reply-To: <199809201934.FAA00868@godzilla.zeta.org.au> from "Bruce Evans" at Sep 21, 98 05:34:46 am
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> >Btw, O_FSYNC isn't documented in open.2. Fsync()ing also seems to
> >be sligtly faster, is this an illusion or is there a difference
> >in the semantics?
> 
> O_FSYNC is a no-op in FreeBSD.  It probably shouldn't be defined.

???

/sys/kern/vfs_vnops.c:vn_write():

        if ((fp->f_flag & O_FSYNC) ||
            (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
                ioflag |= IO_SYNC;

See also:

/sys/ufs/ufs/ufs_readwrite.c

and B_SYNC.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.


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