From mboxrd@z Thu Jan  1 00:00:00 1970
From: lm@bitmover.com (Larry McVoy)
Date: Wed, 16 Apr 2003 20:45:00 -0700
Subject: [TUHS] Re: TUHS digest, Vol 1 #145 - 2 msgs
In-Reply-To: <200304170249.h3H2nQJ8001840@minnie.tuhs.org>
References: <200304170249.h3H2nQJ8001840@minnie.tuhs.org>
Message-ID: <20030417034500.GK26145@work.bitmover.com>

> I am fairly sure that 4.2BSD had manual pages for mmap, but it didn't
> work.

Right.  Joy left Berkeley and joined Sun and the work got done at Sun.
I'm pretty sure that SunOS 4.0 was the first release with mmap working
as it was described.  I was at Sun for the 4.1 release; 4.0 was the new 
VM system, and it wasn't "new" like "we changed some stuff", it was new
as in everything was rewritten.  The 4.0 VM system had segmap, read/write
were implemented with segmap in the kernel (you did a read, the kernel
mapped page, started a bcopy and would fault on itself if the page wasn't
there or had no TLB entry).  Etc.  I have postscript of the papers on
that, still very good reading if someone wants them.
-- 
---
Larry McVoy              lm at bitmover.com          http://www.bitmover.com/lm