As far as I understand, the locking for *when(B) S* code should be
similar *atomic
S*. So if one activity is checking the condition in *when(B) S *in one
object all other activities trying to check it will block irrespective to
on what instances they check.
However, I too thought it should not add a considerable overhead as the
blocking happens to on a quick test and set.
Thank you,
Saliya
On Fri, Nov 16, 2012 at 5:03 PM, LEONID ILYEVSKY
<leonidilyev...@yahoo.com>wrote:
> Now I don't quite understand. Setting the flag is quick, therefore many
> activities can work in parallel on multiple objects between setting and
> unsetting the flag. Only some activities will have to wait if they want to
> access the object that is currently busy.
> Or am I missing something here? If one activity is waiting for the busy
> one at the "when" statement, does it affect another activity which is
> checking different instance of the flag? If that other instance is not
> busy, can it enter the "when" block?
>
> ------------------------------
> *From:* Saliya Ekanayake <esal...@gmail.com>
> *To:* Mailing list for users of the X10 programming language <
> x10-users@lists.sourceforge.net>
> *Sent:* Friday, November 16, 2012 4:43 PM
>
> *Subject:* Re: [X10-users] Atomic blocks
>
> Yes I agree, that in the workaround I posted, setting the flag is still be
> dependent on the single lock.
>
> I wonder if there's some documentation to x10.util.concurrent package?
>
> Thank you,
> Saliya
>
>
> On Fri, Nov 16, 2012 at 4:09 PM, Vijay Saraswat <vi...@saraswat.org>wrote:
>
> On 11/16/12 3:58 PM, LEONID ILYEVSKY wrote:
>
> Saliya suggested to use boolean flag to guard the critical session, set it
> in the "when" block and unset it in "atomic". Looks like a solution
> virtually equivalent to java's synchronization. What do you think?
>
>
> This wont give the performance you want because of the current
> single-lock-per-place implementation (see Dave Cunningham's message).
>
>
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> http://www.esaliya.wordpress.com
>
>
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--
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http://www.esaliya.blogspot.com
http://www.esaliya.wordpress.com
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