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Groups > comp.lang.ruby > #3318

Re: Hash Surprises with Fixnum, #hash, and #eql?

From John W Higgins <wishdev@gmail.com>
Newsgroups comp.lang.ruby
Subject Re: Hash Surprises with Fixnum, #hash, and #eql?
Date 2011-04-21 11:11 -0500
Organization Service de news de lacave.net
Message-ID <BANLkTikZAien8QEJBLu6FFPP7HsS-UrPyQ@mail.gmail.com> (permalink)
References (12 earlier) <4da68c34$0$13393$afc38c87@news.optusnet.com.au> <BANLkTik3Z+TQMVWsoDUX790DkOhV8NF4KA@mail.gmail.com> <4daf9b56$0$3035$afc38c87@news.optusnet.com.au> <BANLkTimxZGo48NVU3UPmrcqW+qVO9VqR1w@mail.gmail.com> <4db023d4$0$13394$afc38c87@news.optusnet.com.au>

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[Note:  parts of this message were removed to make it a legal post.]

Good Morning,

On Thu, Apr 21, 2011 at 5:36 AM, Clifford Heath <no@spam.please.net> wrote:

> On 04/21/11 21:28, Robert Klemme wrote:
>
>> Please keep in mind that in a multithreaded environment there is
>> synchronization overhead.  A solution could use an AtomicBoolean
>>
>
> Oh get real. This is a single variable which may, during the course of
> a single execution, *once* change from false to true. In so doing, it
> enables a slightly more conservative approach to compatibility for one
> small side-effect of a shortcut, which probably doesn't even matter to
> the application, and which is almost certainly set by the one thread
> that cares about that side effect. It *so* doesn't need to be synchronised.
>
>
I'm sorry but the old saying "people in glass houses shouldn't throw stones"
really comes to mind here. This entire thread has been a rant against
implementation semantics being "inconsistent" in 0.001% of applications (if
that) and then you come back with - oh we can cheat here because your fix
would "almost certainly set by the one thread that care about that side
effect".

You don't get to cut a corner in providing a solution to a problem you
believe is cutting a corner. You are asking every one else to take a
performance hit (however small) to fix a problem that you won't even fix
properly? That doesn't seem appropriate at all.

John

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Thread

Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-07 14:01 +1000
  Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 04:19 -0500
    Re: Hash Surprises with Fixnum, #hash, and #eql? Phillip Gawlowski <cmdjackryan@googlemail.com> - 2011-04-07 06:20 -0500
      Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 06:53 -0500
        Re: Hash Surprises with Fixnum, #hash, and #eql? Phillip Gawlowski <cmdjackryan@googlemail.com> - 2011-04-07 08:21 -0500
          Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 08:43 -0500
            Re: Hash Surprises with Fixnum, #hash, and #eql? Phillip Gawlowski <cmdjackryan@googlemail.com> - 2011-04-07 09:02 -0500
              Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 09:28 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Phillip Gawlowski <cmdjackryan@googlemail.com> - 2011-04-07 09:49 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 10:11 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Phillip Gawlowski <cmdjackryan@googlemail.com> - 2011-04-07 10:31 -0500
              Re: Hash Surprises with Fixnum, #hash, and #eql? Brian Candler <b.candler@pobox.com> - 2011-04-07 11:06 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Vincent Manis <vmanis@telus.net> - 2011-04-07 17:42 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-08 01:55 -0500
    Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-08 17:29 +1000
      Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-08 05:12 -0500
        Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-09 11:21 +1000
          Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-10 19:02 -0500
            Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-11 13:17 +1000
              Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-12 04:09 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-13 12:02 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-13 00:51 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-13 16:32 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-13 07:23 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-14 07:38 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-14 00:36 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-14 15:55 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-19 17:41 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-21 12:49 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-21 06:28 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-21 22:32 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-21 08:51 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? John W Higgins <wishdev@gmail.com> - 2011-04-21 11:11 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-27 00:33 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-27 01:44 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-27 16:22 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-04-27 00:23 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-30 17:43 +1000
                Re: Hash Surprises with Fixnum, #hash, and #eql? Charles Oliver Nutter <headius@headius.com> - 2011-05-01 23:01 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Robert Klemme <shortcutter@googlemail.com> - 2011-04-13 02:08 -0500
                Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-14 07:36 +1000
      Re: Hash Surprises with Fixnum, #hash, and #eql? Xavier Noria <fxn@hashref.com> - 2011-04-08 19:00 -0500
        Re: Hash Surprises with Fixnum, #hash, and #eql? Clifford Heath <no@spam.please.net> - 2011-04-09 11:22 +1000
  Re: Hash Surprises with Fixnum, #hash, and #eql? Mazi Ayışığı <mazi.ayisigi@gmail.com> - 2011-04-07 17:16 -0700

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