Hi, Ales,
X10 does have the facility to check at run time whether the reference
is to a local object or to a "remote" object (the "remote" is in quotes
because on a shared memory implementation there isn't that much of a
difference). However, that facility is turned off by default. To turn
it on, run the program giving the -BAD_PLACE_RUNTIME_CHECK=true argument
to the "x10" script.
Igor
"Ales Kozumplik" <[EMAIL PROTECTED]> wrote on 10/10/2008 09:08:14
AM:
> Hi,
>
> I'm getting a bit confused here: I have declared an array distributed
across
> several places. When I make a function that reads and modifies every
element
> of this array, the program builds and runs without throwing an
exception.
>
> Isn't this contradicting e.g. paragraph 2.3 in the Report where it's
said
> that:
>
> """
> an activity may
synchronously
> access
> data items only in the current place (the place in which the activity is
> running).
> It may atomically update one or more data items, but only in the current
> place.
> To read a remote location, an activity must spawn another activity
> asynchronously
> (ยง14.2).
> """
> ?
>
> Or does this simply mean that spawning the activity and forcing futures
> happens 'behind the scenes' ? I'm attaching my program below, perhaps
I've
> misunderstood some of the concepts. I'm using X10 1.7.
>
> Thank you,
> Ales
>
> === ===
> class AsyncArr
> {
> val VECTLENGTH = 8;
> val Reg:Region = 0..VECTLENGTH-1;
> val Distr = dist.makeBlock(Reg);
>
> public def run() : void
> {
> System.out.println(Distr);
> val a = Array.make[int](Distr, (p(i) : Point) => i);
> for (var i:int = 0; i < VECTLENGTH; i++)
> {
> a(i) = a(i)*2;
> System.out.println(a(i));
> }
> }
>
> public static def main(var args: Rail[String])
> {
> new AsyncArr().run();
> }
> }
>
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--
Igor Peshansky (note the spelling change!)
IBM T.J. Watson Research Center
XJ: No More Pain for XML's Gain (http://www.research.ibm.com/xj/)
X10: Parallel Productivity and Performance (http://x10.sf.net/)
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