VarHandles & LMAX Disruptor

Michael Barker mikeb01 at gmail.com
Mon Jul 27 21:04:37 UTC 2015


On 28 July 2015 at 02:32, Brian Goetz <brian.goetz at oracle.com> wrote:

>         - I think VarHandle.set/get should be called
>>         setRelaxed/getRelaxed as
>>         it> would make it more obvious to a user and a reader what those
>>         methods are> going to do.  My initial assumption was that they
>> were
>>         no different from a> normal write/read of a field.
>>
>>     An alternative here is that get/set does whatever the default is for
>>     that field (so a volatile field would get ordered access) and
>>     {get,set}Relaxed would force a relaxed access (even for volatile
>>     fields.)
>>
>> That would make sense, however it would preclude the ability to apply a
>> normal load/store to volatile field.
>>
>
> Sorry, I wasn't clear.  "Alternative" applied to "get rid of get/set"
> within the context of having an explicit {set,get}Relaxed.  In other words,
> have getters/setters for all the modes, and then define "naked" get/set to
> mean "whatever is default for this variable.
>

If VarHandles supported all access modes (Volatile, Acq/Rel, Relaxed and
Normal) with explicit calls and provided "naked" get/set as a default based
on the absence/presence of the volatile modifier then that would make for a
nice, complete API.

Mike.


More information about the valhalla-dev mailing list