API review of VarHandles

Vitaly Davidovich vitalyd at gmail.com
Fri Jan 22 00:01:47 UTC 2016

I think the get/setOpaque methods need a bit more explanation ("opaque" is
an odd naming choice, IMO).  Specifically, it says the operations are done
in program order but have no effect on inter-thread ordering/visibility.
Is this spec verbiage for a full compiler-only fence?

On Thursday, January 21, 2016, Paul Sandoz <paul.sandoz at oracle.com> wrote:

> Hi
> This is a request to review the VarHandles API. The code reviews and
> pushes will occur separately, and flow through the hs-comp repo, most
> likely from the bottom up first with Unsafe changes.
> The specdiff can be found here:
> http://cr.openjdk.java.net/~psandoz/jdk9/varhandles/specdiff/overview-summary.html
> (Note that specdiff renders some aspects of JavaDoc incorrectly, so just
> ignore any such quirks.)
> A consensus on the set of access mode methods proposed by Doug was
> previously discussed and reached.
> For the moment please ignore the following methods on MethodHandles:
> byteArrayViewVarHandle; and byteBufferViewVarHandle. It is necessary to
> revisit that functionality w.r.t. alignment and proposed enhancements to
> ByteBuffer (in discussion on valhalla-dev).
> Paul.

Sent from my phone

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