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Groups > comp.lang.java.programmer > #11461
| From | "raphfrk@gmail.com" <raphfrk@gmail.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Volatile happens before question |
| Date | 2012-01-18 06:24 -0800 |
| Organization | http://groups.google.com |
| Message-ID | <60dddbf9-3686-4824-a918-64a59faba177@a8g2000vba.googlegroups.com> (permalink) |
| References | (8 earlier) <jf5g64$uga$1@dont-email.me> <k0j9x3nt2or.70vxbwtikmz$.dlg@40tude.net> <jf5mm0$ndt$1@dont-email.me> <1pi7kea3zdo0b.1ixhuq3p9ybbu$.dlg@40tude.net> <fkmiu8-6vc.ln1@news.simpsonst.f2s.com> |
So, is there a way to do a basic read-write lock without using the
synchronized keyword?
Would the lock from this page work?
http://mailinator.blogspot.com/2007/05/readerwriter-in-java-in-nonblocking.html
He has an atomic integer as a counter.
The write operation is
incrementcounter() -> set to odd number = unstable
<perform update>
incrementCounter() -> set to even number = stable
The write operation uses a standard lock so writes are in the right
sequence.
The read operation is
do {
while ((save = counter.get()) & 1 == 1); // loop while unstable
value = <read value>
if (counter.get() == save) {
return value;
}
} while (true);
So, a read confirms that the read value is stable (even) at the start
and doesn't change while the read happens. If it changes, then repeat.
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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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