I think it makes an immutable copy of the variables in the scope of the
coforall as an intent. If you tried to assign to x or r in your coforall you'd
get an lvalue assignment error.
> On Jun 10, 2016, at 4:36 PM, Nikhil Padmanabhan
> <[email protected]> wrote:
>
> Hi ---
>
> I'm misunderstanding something about locales -- consider the following
> program :
>
> record R {
> var x : int;
> }
>
> proc main() {
> var r : R;
> var x : int;
> writeln("-----");
> for loc in Locales do on loc {
> writeln('X :',x.locale);
> writeln('R :',r.locale);
> }
> writeln("-----");
> coforall loc in Locales do on loc {
> writeln('X :',x.locale);
> writeln('R :',r.locale);
> }
> }
>
> $ ./a.out -nl 2
> -----
> X :LOCALE0
> R :LOCALE0
> X :LOCALE0
> R :LOCALE0
> -----
> X :LOCALE0
> R :LOCALE0
> X :LOCALE1
> R :LOCALE1
>
> So --- the for and coforall have very different behaviors regarding locales,
> which surprised me. I'm guessing this is because coforall makes a copy (to
> avoid races on X and R) while for doesn't....
>
> Is this behavior intentional?
>
> Thanks!
> -- Nikhil
>
>
>
>
> ---------------------------------
> Nikhil Padmanabhan
> [email protected]
> ------------------------------------------------------------------------------
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