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Re: Volatile happens before question

Date 2012-01-17 14:55 -0800
From Patricia Shanahan <pats@acm.org>
Newsgroups comp.lang.java.programmer
Subject Re: Volatile happens before question
References (5 earlier) <jf4dip$203$1@dont-email.me> <15jRq.2104$d%2.1226@newsfe07.iad> <jf4fd8$der$1@dont-email.me> <DEjRq.5131$Xa1.4052@newsfe15.iad> <jf4khn$fqt$1@dont-email.me>
Message-ID <zLudnc9ZU7DQYYjSnZ2dnUVZ_rKdnZ2d@earthlink.com> (permalink)

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On 1/17/2012 12:09 PM, markspace wrote:
> On 1/17/2012 11:06 AM, Daniel Pitts wrote:
...
>> If b=1, that means a MUST be true.
>
> No, if b = 1, it could just be a random value made up by the CPU.

That is one of the few behaviors that is specifically excluded. "Each
read sees a write to the same variable in the execution.",
http://java.sun.com/docs/books/jls/third_edition/html/memory.html#17.4.7

Patricia

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Thread

Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-17 04:04 -0800
  Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 08:17 -0800
    Re: Volatile happens before question markspace <-@.> - 2012-01-17 08:50 -0800
      Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-17 09:00 -0800
    Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-17 08:54 -0800
      Re: Volatile happens before question markspace <-@.> - 2012-01-17 11:24 -0800
    Re: Volatile happens before question Patricia Shanahan <pats@acm.org> - 2012-01-17 14:49 -0800
      Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 15:49 -0800
      Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 17:14 -0800
        Re: Volatile happens before question Patricia Shanahan <pats@acm.org> - 2012-01-17 18:17 -0800
          Re: Volatile happens before question Joshua Maurice <joshuamaurice@gmail.com> - 2012-01-19 16:45 -0800
  Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 08:18 -0800
    Re: Volatile happens before question markspace <-@.> - 2012-01-17 08:33 -0800
      Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 08:49 -0800
        Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 09:21 -0800
          Re: Volatile happens before question markspace <-@.> - 2012-01-17 10:10 -0800
            Re: Volatile happens before question Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-01-17 10:28 -0800
              Re: Volatile happens before question markspace <-@.> - 2012-01-17 10:41 -0800
                Re: Volatile happens before question Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-01-17 11:06 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-17 12:09 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-17 12:12 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-17 12:38 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-17 13:35 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-17 14:41 -0800
                Re: Volatile happens before question Patricia Shanahan <pats@acm.org> - 2012-01-17 14:55 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-17 15:27 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 17:37 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 17:42 -0800
            Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 15:46 -0800
              Re: Volatile happens before question markspace <-@.> - 2012-01-17 16:14 -0800
                Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 20:01 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 20:37 -0800
                Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-17 21:52 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-17 23:47 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-18 00:08 -0800
                Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-18 09:04 -0800
                Re: Volatile happens before question Steven Simpson <ss@domain.invalid> - 2012-01-18 11:22 +0000
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-18 06:24 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-18 07:32 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-18 08:34 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 10:12 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-18 11:15 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 11:59 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-18 12:24 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 13:16 -0800
                Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-18 15:00 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 16:12 -0800
                Re: Volatile happens before question Patricia Shanahan <pats@acm.org> - 2012-01-18 16:34 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 17:17 -0800
                Re: Volatile happens before question Patricia Shanahan <pats@acm.org> - 2012-01-18 19:03 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-18 15:30 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-18 16:10 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-19 08:18 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-19 09:40 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-19 10:10 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-19 10:39 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-19 12:13 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-19 13:31 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-19 16:14 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-19 21:16 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-20 03:23 -0800
                Re: Volatile happens before question "raphfrk@gmail.com" <raphfrk@gmail.com> - 2012-01-20 06:46 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-20 08:56 -0800
                Re: Volatile happens before question Lew <noone@lewscanon.com> - 2012-01-20 11:12 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-18 17:06 -0800
                Re: Volatile happens before question Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-01-19 12:46 -0800
                Re: Volatile happens before question markspace <-@.> - 2012-01-19 13:38 -0800
                Re: Volatile happens before question Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-18 07:32 -0800
                Re: Volatile happens before question Lew <noone@lewscanon.com> - 2012-01-18 00:06 -0800
                Re: Volatile happens before question Knute Johnson <nospam@knutejohnson.com> - 2012-01-18 09:23 -0800
                Re: Volatile happens before question Joshua Maurice <joshuamaurice@gmail.com> - 2012-01-19 17:07 -0800
                Re: Volatile happens before question Joshua Maurice <joshuamaurice@gmail.com> - 2012-01-19 17:12 -0800
                Re: Volatile happens before question Joshua Maurice <joshuamaurice@gmail.com> - 2012-01-19 19:22 -0800
  Re: Volatile happens before question Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-01-17 10:24 -0800

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