Hi Kirak,
I'm assuming that src_array was created at (here).
In the first example, the src_array that is modified is actually a copy
of a copy - it is copied to here.next() in the first line and then again
(to the same place). Note that at(here) is _not_ a noop - it copies all
variables in the closure environment! This is to make the behaviour of
the at statement consistent regardless of the target place.
The second example doesn't actually work for me, etiher (against SVN
HEAD) - if I print the contents of src_array, they have not been
updated. Again, the src_array that is updated is a copy, so the updates
don't affect the original src_array.
Have a look at the RemoteArray class and the Array.copy(...) and
Array.asyncCopy(...) methods. These support a variety of patterns of
local and remote updates - hopefully one of them matches your requirement.
Cheers,
Josh
On 17/12/10 16:16, Kirak Hong wrote:
> Hi,
>
> I have another question regarding X10 array. I tried to modify a local array
> from remote place using following code. I noticed that there's some
> computation running, but the content of array was never changed.
>
> at(here.next())
> at(here)
> {
> for(p in src_array)
> {
> src_array(p) = 10000;
> }
>
> }
>
> for(p in src_array)
> Console.OUT.println(src_array(p));
>
> However, the following code seems to be working, although it is highly
> inefficient.
>
> at(here.next())
> for(p in src_array)
> {
> var x : int = 0;
> at(here)
> {
> x = 10000;
> }
> src_array(p) = x;
> }
>
> I looked at the X10 programming manual and it says it will implicitly copy
> an object to another place if that object is used within 'at' clause.
> However, I don't understand why above behavior happens. Can anybody tell me
> the reason?
>
> Thanks,
> Kirak
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