From: Venkatesh Srinivas <me@endeavour.zapto.org>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] A little more ado about async Tclunk
Date: Fri, 29 Oct 2010 11:55:00 -0400 [thread overview]
Message-ID: <AANLkTimDWoSF6zAM72BOnpDb-2Ai0D--rJFuyMeAhOKP@mail.gmail.com> (raw)
In-Reply-To: <dbb7239e8c352e8db20ca68c849e381a@terzarima.net>
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On Fri, Oct 29, 2010 at 5:01 AM, Charles Forsyth <forsyth@terzarima.net>wrote:
> >What you are saying is that the problem could be something like:
>
> >-> Tclunk
> >(do not wait for response)
> >-> Topen (the file is exclusive)
>
> no, because what actually happens is closer to
> A: Topen
> ...
> queue request to *another process* to send Tclunk
> ...
> A: Topen
>
> leading to either case 1
> A: Topen
> B: Tclunk
> A: Topen
>
> or case 2
> A: Topen
> A: Topen
> B: Tclunk
>
> depending on the scheduling of the two processes A and B
>
> introducing that other process introduces a new race, that simply did not
> exist before, because
> that other process didn't exist before. you always got case 1.
>
> and indeed, with the test i ran on the modified system usually it gets case
> 1
> because of timing, but eventually a case 2 shows up and the second open
> fails.
>
>
Correct. Either ordering is reasonable and not-a-problem when dealing with a
decent fileserver. There are certainly file servers and open options that
force single-open, but this approach is not for them.
-- vs
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next prev parent reply other threads:[~2010-10-29 15:55 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 3:02 Venkatesh Srinivas
2010-10-27 4:23 ` erik quanstrom
2010-10-27 6:27 ` Bruce Ellis
2010-10-27 13:50 ` Charles Forsyth
2010-10-27 13:53 ` Gorka Guardiola
2010-10-27 13:55 ` Francisco J Ballesteros
2010-10-27 14:12 ` John Floren
2010-10-27 14:13 ` Eric Van Hensbergen
2010-10-27 14:48 ` Venkatesh Srinivas
2010-10-27 15:45 ` erik quanstrom
2010-10-27 15:54 ` Venkatesh Srinivas
2010-10-27 21:04 ` Bruce Ellis
2010-10-28 12:12 ` Charles Forsyth
2010-10-28 13:32 ` Bruce Ellis
2010-10-28 14:30 ` Gorka Guardiola
2010-10-28 14:39 ` Gorka Guardiola
2010-10-28 14:58 ` erik quanstrom
2010-10-28 14:41 ` Francisco J Ballesteros
2010-10-28 14:45 ` Eric Van Hensbergen
2010-10-28 14:56 ` Francisco J Ballesteros
2010-10-28 15:37 ` Nathaniel W Filardo
2010-10-28 15:40 ` erik quanstrom
2010-10-28 15:53 ` Francisco J Ballesteros
2010-10-28 19:17 ` Venkatesh Srinivas
2010-10-28 19:24 ` Venkatesh Srinivas
2010-10-28 20:18 ` Charles Forsyth
2010-10-28 20:32 ` Venkatesh Srinivas
2010-10-28 20:55 ` Nemo
2010-10-28 21:22 ` Venkatesh Srinivas
2010-10-28 22:17 ` Francisco J Ballesteros
2010-10-28 23:51 ` Gorka Guardiola
2010-10-29 5:37 ` Bruce Ellis
2010-10-29 7:44 ` Gorka Guardiola
2010-10-29 8:51 ` Bruce Ellis
2010-10-29 9:01 ` Charles Forsyth
2010-10-29 8:58 ` Bruce Ellis
2010-10-29 16:38 ` Charles Forsyth
2010-10-29 9:45 ` Gorka Guardiola
2010-10-29 9:56 ` Bruce Ellis
2010-10-29 16:01 ` Charles Forsyth
2010-10-29 15:58 ` Venkatesh Srinivas
2010-10-29 16:02 ` roger peppe
2010-10-29 16:17 ` Bruce Ellis
2010-10-29 16:47 ` roger peppe
2010-10-29 16:04 ` Charles Forsyth
2010-10-29 14:14 ` Eric Van Hensbergen
2010-10-29 15:21 ` roger peppe
2010-10-29 15:36 ` erik quanstrom
2010-10-29 15:39 ` Eric Van Hensbergen
2010-10-29 15:49 ` Charles Forsyth
2010-10-29 15:50 ` Eric Van Hensbergen
2010-10-29 15:59 ` Bruce Ellis
2010-10-29 16:28 ` Venkatesh Srinivas
2010-10-29 17:16 ` erik quanstrom
2010-10-29 16:47 ` David Leimbach
2010-10-29 17:13 ` Charles Forsyth
2010-10-29 17:22 ` David Leimbach
2010-10-29 17:26 ` erik quanstrom
2010-10-29 17:47 ` Bruce Ellis
2010-10-29 19:33 ` roger peppe
2010-10-29 20:27 ` Bruce Ellis
2010-10-29 20:41 ` Gorka Guardiola
2010-10-29 20:44 ` Bruce Ellis
2010-10-29 22:31 ` Bakul Shah
2010-10-29 22:39 ` roger peppe
2010-10-29 22:43 ` Bruce Ellis
2010-10-29 23:07 ` roger peppe
2010-10-29 23:28 ` Bruce Ellis
2010-10-30 9:08 ` Nemo
2010-10-31 5:39 ` Bruce Ellis
2010-10-31 8:52 ` roger peppe
2010-10-31 8:57 ` Bruce Ellis
2010-10-31 10:25 ` fgergo
2010-10-31 11:11 ` fgergo
2010-10-31 11:21 ` Bruce Ellis
2010-10-31 11:23 ` roger peppe
2010-10-31 13:06 ` Gorka Guardiola
2010-10-31 13:07 ` Gorka Guardiola
2010-10-31 13:22 ` Gorka Guardiola
2010-11-02 14:29 ` Richard Miller
2010-10-31 14:21 ` Eric Van Hensbergen
2010-10-31 22:17 ` Bruce Ellis
2010-10-31 22:32 ` EBo
2010-10-31 22:41 ` Steve Simon
2010-11-02 13:49 ` Richard Miller
2010-11-02 14:02 ` Eric Van Hensbergen
2010-10-29 18:27 ` David Leimbach
2010-10-29 17:18 ` Charles Forsyth
2010-10-29 17:17 ` erik quanstrom
2010-10-29 17:25 ` David Leimbach
2010-10-29 18:03 ` Eric Van Hensbergen
2010-10-29 18:54 ` Gorka Guardiola
2010-10-29 19:30 ` David Leimbach
2010-10-29 20:20 ` erik quanstrom
2010-10-29 15:55 ` Venkatesh Srinivas [this message]
2010-10-29 13:12 ` roger peppe
2010-10-29 13:20 ` Lucio De Re
2010-10-29 15:51 ` Charles Forsyth
2010-10-29 16:36 ` Charles Forsyth
2010-10-27 15:09 ` David Leimbach
2010-10-28 21:39 erik quanstrom
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