From: Richard Miller <rm@hamnavoe.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] ls, rc question
Date: Fri, 19 Mar 2004 09:24:51 +0000 [thread overview]
Message-ID: <aaebe89eb51daf9e4816b636ef595317@hamnavoe.com> (raw)
In-Reply-To: <34feff09e0eb478d71030dd09fcd8135@terzarima.net>
>>>The thing is, reads from a union directory do in fact give you the union.
>
> i think the argument is provoked by the assumption that it's a union of sets, preventing duplicates,
> but the system happens to work with bags, not sets, where union can (must) allow duplicates.
Sorry, David is correct on this point. Sets and bags are both
unordered, and union is therefore commutative. But directories are
ordered -- the ordering is essential to resolve the ambiguity of
duplicate names. So the accurate mathematical model is a sequence
(aka list), and bind is not union of sets or bags, but append of
sequences -- a non-commutative operator, hence the need to specify
MBEFORE or MAFTER.
-- Richard
next prev parent reply other threads:[~2004-03-19 9:24 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 21:40 [9fans] ls question David Tolpin
2004-03-18 21:58 ` Russ Cox
2004-03-18 22:05 ` Russ Cox
2004-03-18 23:00 ` [9fans] ls, rc question David Tolpin
2004-03-18 23:31 ` [9fans] dirread David Tolpin
2004-03-18 23:49 ` ron minnich
2004-03-19 0:14 ` boyd, rounin
2004-03-19 3:38 ` rsc
2004-03-19 3:41 ` [9fans] ls, rc question rsc
2004-03-19 5:32 ` David Tolpin
2004-03-19 5:45 ` boyd, rounin
2004-03-19 5:50 ` ron minnich
2004-03-19 6:45 ` boyd, rounin
2004-03-19 9:07 ` Charles Forsyth
2004-03-19 9:24 ` Richard Miller [this message]
2004-03-19 9:33 ` boyd, rounin
2004-03-19 9:39 ` Richard Miller
2004-03-19 9:46 ` Geoff Collyer
2004-03-19 10:11 ` Richard Miller
2004-03-19 10:42 ` Charles Forsyth
2004-03-19 10:03 ` Charles Forsyth
2004-03-19 9:38 ` [9fans] Bind, look, everything is duplicated David Tolpin
2004-03-19 7:01 ` [9fans] ls, rc question Micah Stetson
2004-03-19 7:57 ` [9fans] ls, rc question -- proposed change to rc/glob.c David Tolpin
2004-03-19 8:13 ` Rob Pike
2004-03-19 8:18 ` David Tolpin
2004-03-19 8:24 ` David Tolpin
2004-03-19 8:27 ` Rob Pike
2004-03-19 8:52 ` David Tolpin
2004-03-19 9:16 ` Richard Miller
2004-03-19 9:29 ` boyd, rounin
2004-03-19 9:41 ` Geoff Collyer
2004-03-19 10:09 ` boyd, rounin
2004-03-19 10:50 ` Geoff Collyer
2004-03-19 11:12 ` David Tolpin
2004-03-19 12:31 ` Charles Forsyth
2004-03-19 12:53 ` boyd, rounin
2004-03-19 13:59 ` David Presotto
2004-03-19 14:44 ` David Tolpin
2004-03-19 17:57 ` Russ Cox
2004-03-19 18:04 ` David Tolpin
2004-03-19 20:31 ` Geoff Collyer
2004-03-22 22:56 ` rog
2004-03-22 23:19 ` Scott Schwartz
2004-03-22 23:50 ` Charles Forsyth
2004-03-23 0:28 ` rog
2004-03-23 0:40 ` Charles Forsyth
2004-03-23 0:49 ` Charles Forsyth
2004-03-23 2:12 ` ron minnich
2004-03-23 2:16 ` boyd, rounin
2004-03-23 3:15 ` rog
2004-03-23 11:13 ` a
2004-03-23 11:47 ` Geoff Collyer
2004-03-19 8:31 ` Richard Miller
2004-03-19 8:47 ` Geoff Collyer
2004-03-19 9:07 ` Rob Pike
2004-03-19 9:34 ` David Tolpin
2004-03-19 9:52 ` Scott Schwartz
2004-03-19 14:42 ` ron minnich
2004-03-19 16:18 ` 9nut
2004-03-19 15:34 ` david presotto
2004-03-19 15:43 ` ron minnich
2004-03-19 16:00 ` Charles Forsyth
2004-03-19 16:02 ` Charles Forsyth
2004-03-19 16:23 ` David Presotto
2004-03-19 16:34 ` Richard Miller
2004-03-19 16:47 ` a
2004-03-19 16:52 ` Richard Miller
2004-03-19 17:15 ` David Presotto
2004-03-21 20:47 ` rog
2004-03-21 20:50 ` boyd, rounin
2004-03-21 21:53 ` ron minnich
2004-03-21 22:05 ` Charles Forsyth
2004-03-21 23:29 ` Enache Adrian
2004-03-22 1:30 ` boyd, rounin
2004-03-22 10:09 ` Douglas A. Gwyn
2004-03-22 10:49 ` Charles Forsyth
2004-03-22 12:15 ` boyd, rounin
2004-03-22 18:23 ` Derek Fawcus
2004-03-23 0:06 ` boyd, rounin
2004-03-19 16:34 ` a
2004-03-19 15:53 ` lucio
2004-03-19 16:01 ` Charles Forsyth
2004-03-19 16:08 ` andrey mirtchovski
2004-03-19 16:12 ` ron minnich
2004-03-19 16:22 ` lucio
2004-03-19 19:42 ` boyd, rounin
2004-03-19 14:13 ` Russ Cox
2004-03-19 14:37 ` David Tolpin
2004-03-19 8:35 ` boyd, rounin
2004-03-19 14:19 ` Russ Cox
2004-03-18 21:59 ` [9fans] ls question David Presotto
2004-03-18 22:05 ` matt
2004-03-18 22:04 ` David Tolpin
2004-03-18 22:08 ` boyd, rounin
2004-03-19 10:26 [9fans] ls, rc question Tiit Lankots
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