[concurrency-interest] @Contended (JEP-142)

√iktor Ҡlang viktor.klang at gmail.com
Thu Nov 29 07:19:49 EST 2012


On Thu, Nov 29, 2012 at 12:40 PM, Stanimir Simeonoff
<stanimir at riflexo.com>wrote:

> Problem w/ sun.misc is that it requires security permissions on runtime
> whilst it's an absolutely harmless operation. To avoid that people will
> just keep padding like it's done now - i.e. nothing achieved.
>



> For instance, I can live by extending j.u.c.atomics even it's ugly just to
> avoid touching Unsafe itself (or the AtomicUpdaters)


That doesn't address the need for padding.


>
>
> Stanimir
>
>
> On Thu, Nov 29, 2012 at 1:00 PM, Dr Heinz M. Kabutz <
> heinz at javaspecialists.eu> wrote:
>
>> **
>> IMHO, sun.misc.Contended is the right place for this one, as it will
>> hopefully discourage people from using it, unless they really know what
>> they are doing.  Next you find programmers making all their fields
>> "Contended", because they read on some blog that it makes things faster.
>> Then instead of your object using only 32 bytes, it gets bloated to 512
>> bytes.
>>
>> Regards
>>
>> Heinz
>> --
>> Dr Heinz M. Kabutz (PhD CompSci)
>> Author of "The Java(tm) Specialists' Newsletter"
>> Sun Java Champion
>> IEEE Certified Software Development Professionalhttp://www.javaspecialists.eu
>> Tel: +30 69 75 595 262
>> Skype: kabutz
>>
>>
>>
>> On 11/29/12 11:11 AM, Stanimir Simeonoff wrote:
>>
>> >>Any concrete suggestion? j.u.c.Contended? j.u.c.hints.Contended?
>> j.u.c.expert.Contended?
>> I'd go with "hints".
>>
>> Stanimir
>>
>>
>> On Thu, Nov 29, 2012 at 11:43 AM, Aleksey Shipilev <
>> aleksey.shipilev at oracle.com> wrote:
>>
>>> On 11/28/2012 08:42 PM, Gregg Wonderly wrote:
>>> > Going down that path, makes me feel like having it in a more "public"
>>> > package would be a better choice.  The name "Contended" is now going to
>>> > be a "reserved" name for many people, when used in annotation form.
>>>  So,
>>> > why not just make it a publicly defined "annotation" which has
>>> > appropriate implementation in appropriate environments?
>>>
>>>  Any concrete suggestion? j.u.c.Contended? j.u.c.hints.Contended?
>>> j.u.c.expert.Contended?
>>>
>>> -Aleksey.
>>>
>>>
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>>
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-- 
Viktor Klang

Akka Tech Lead
Typesafe <http://www.typesafe.com/> - The software stack for applications
that scale

Twitter: @viktorklang
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