cvs commit: src/lib/libc/sys msync.2

[Christian Brueffer]

On Sun, Sep 05, 2004 at 02:46:32PM -0500, Alan Cox wrote:
> On Sat, Sep 04, 2004 at 09:30:43PM -0400, David Schultz wrote:
> > On Fri, Sep 03, 2004, Peter Pentchev wrote:
> > > roam        2004-09-03 06:24:25 UTC
> > > 
> > >   FreeBSD src repository (doc,ports committer)
> > > 
> > >   Modified files:
> > >     lib/libc/sys         msync.2 
> > >   Log:
> > >   Add a BUGS section and copy the wording from mmap(2)'s MAP_NOSYNC,
> > >   documenting the obsoleteness of the msync(2) syscall and its single
> > >   remaining purpose.
> > 
> > I'm not nitpicking at you since you didn't write the original
> > text, but if msync(2) still has a purpose, then it isn't really
> > obsolete, is it?  (Moreover, the text only describes the purpose of
> > msync(2) with the MS_ASYNC flag.)  Applications such as databases
> > that want greater control over the flushing of dirty data may
> > still find msync(2) very useful.
> 
> I agree.  This sentence should be removed from both msync.2 and mmap.2
> for precisely the reason you state.
> 
> It is, however, worth mentioning that FreeBSD has a unified buffer and
> virtual memory page cache in these man pages.  In fact, that does make
> most uses of msync()'s MS_INVALIDATE flag unnecessary.  (The useful cases
> being things like the extension used by the Nvidia driver.)
> 
> On a related note, where do we stand with respect to the use of X/Open
> man pages?  The X/Open man page for msync(2) is much better than ours.
> 

"The IEEE and The Open Group have granted permission to the FreeBSD
Project to incorporate material from the joint IEEE 1003.1\x{2122}
POSIX® standard and The Open Group Base Specifications Issue 6."

http://www.opengroup.org/press/01jun04.htm

- Christian

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
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