Groups > comp.os.linux.development.apps > #59

Re: mkdir() and thread safety()

From	Rainer Weikusat <rweikusat@mssgmbh.com>
Newsgroups	comp.os.linux.development.apps
Subject	Re: mkdir() and thread safety()
Date	2011-03-31 11:17 +0100
Message-ID	<87pqp7tx0a.fsf@sapphire.mobileactivedefense.com> (permalink)
References	<9d56213c-a054-428e-866c-559da29fbbc3@o21g2000prh.googlegroups.com> <2d58ece6-bb9c-42e0-a990-fc13b92723ec@a21g2000prj.googlegroups.com> <87oc4vtn8o.fsf@sapphire.mobileactivedefense.com> <d18b0392-2e9d-49e5-911b-0b0a07c3f082@i35g2000prd.googlegroups.com> <87lizwjln1.fsf@araminta.anjou.terraraq.org.uk>

Show all headers | View raw

Richard Kettlewell <rjk@greenend.org.uk> writes:
> David Schwartz <davids@webmaster.com> writes:
>> Rainer Weikusat <rweiku...@mssgmbh.com> wrote:
>>> Also, the UNIX(*) standard demands that mkdir is supposed to fail
>>> with EEXIST when the named file already existed. This is not possible
>>> when mkdir is not an atomic operation.
>>
>> Yes, it is. The algorithm I specified will always fail if the named
>> file already existed before the operation started. There is no
>> requirement for atomicity. You can't just make up requirements because
>> they seem reasonable to you.
>
> I'd go further than that: even when there is a standardized requirement
> for atomicity (or any other property), you may still need to check what
> the implementation does.  NFS's failure to properly support O_EXCL is
> notorious.

You actually need to do so because Kennedy was shot, clearly proving
that all kinds of things nobody expects CAN and DO happen ...

Back to comp.os.linux.development.apps | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Re: mkdir() and thread safety() David Schwartz <davids@webmaster.com> - 2011-03-30 14:53 -0700
  Re: mkdir() and thread safety() Richard Kettlewell <rjk@greenend.org.uk> - 2011-03-30 23:20 +0100
    Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-03-31 11:17 +0100
  Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-03-31 11:14 +0100
    Re: mkdir() and thread safety() George Neuner <gneuner2@comcast.net> - 2011-03-31 19:13 -0400
      Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-04-01 16:52 +0100
        Re: mkdir() and thread safety() George Neuner <gneuner2@comcast.net> - 2011-04-03 13:59 -0400
          Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-04-08 23:59 +0100
    Re: mkdir() and thread safety() David Schwartz <davids@webmaster.com> - 2011-04-01 12:22 -0700
      Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-04-01 21:03 +0100
        Re: mkdir() and thread safety() David Schwartz <davids@webmaster.com> - 2011-04-01 14:27 -0700
      Re: mkdir() and thread safety() Rainer Weikusat <rweikusat@mssgmbh.com> - 2011-04-01 21:23 +0100
        Re: mkdir() and thread safety() David Schwartz <davids@webmaster.com> - 2011-04-01 14:28 -0700

csiph-web