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Re: AtomicReferenceArray writes and visibility

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On 3/31/11 9:22 PM, markspace wrote:
> [...]
> Read the source code for the AtomicReferenceArray. set() doesn't use any
> synchronization. It calls sun.misc.Unsafe#putObjectVolatile(). I don't
> see how that's going to create a happens-before.

"volatile" creates the happens-before.  All writes before a volatile 
write in the same thread must be visible in a given thread after a 
volatile read in the same thread from the same location.

It's sufficient synchronization to ensure the order of operations, even 
though it's not specifically the "synchronized" statement being used.

Pete

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AtomicReferenceArray writes and visibility v_borchert@despammed.com (Volker Borchert) - 2011-03-31 05:43 +0000
  Re: AtomicReferenceArray writes and visibility Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-03-31 00:52 -0700
    Re: AtomicReferenceArray writes and visibility v_borchert@despammed.com (Volker Borchert) - 2011-04-02 06:28 +0000
  Re: AtomicReferenceArray writes and visibility Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2011-03-31 20:55 -0700
  Re: AtomicReferenceArray writes and visibility markspace <-@.> - 2011-03-31 21:22 -0700
    Re: AtomicReferenceArray writes and visibility Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-03-31 21:54 -0700
      Re: AtomicReferenceArray writes and visibility markspace <-@.> - 2011-03-31 21:58 -0700
        Re: AtomicReferenceArray writes and visibility Patricia Shanahan <pats@acm.org> - 2011-03-31 22:24 -0700
          Re: AtomicReferenceArray writes and visibility markspace <-@.> - 2011-03-31 22:55 -0700
  Re: AtomicReferenceArray writes and visibility Lew <lew@lewscanon.com> - 2011-04-01 11:40 -0700

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