Hi Nicholas,
Thanks for the detailed and informative reply.
The writeln line was not part of the language spec.
Thank you once again..
On 5 May 2017 6:06 pm, "Nicholas Park" <[email protected]> wrote:
Hi Tomsy,
I think this is because you're directly printing the sync variable. This
results in questions like "Should writeln() block until count$ is full?"
and "If count$ is full, should writeln() leave it empty?". Since these
decisions may be specific to the use-case, the compiler forces you to use one
of the explicit read??() methods
<http://chapel.cray.com/docs/master/builtins/internal/ChapelSyncvar.html#ChapelSyncvar.sync.readFE>
.
The compiler error suggests that you make a change such as:
> writeln("Count = ", count$.readFF());
in order to print out the value in count$. You'll have to choose whether
readFE() or readFF() suit your use-case.
If this code is directly from the language spec, then the spec probably
needs to be updated.
Nick
On Fri, May 5, 2017 at 2:09 AM, Tomsy Paul <[email protected]> wrote:
> Hi all,
>
> I was trying to compile a program from Language spec.
>
> var count$:sync int = 0;
> cobegin {
> count$ += 1;
> count$ += 1;
> count$ += 1;
> }
> writeln("Count = ",count$);
>
> On compilation, it resulted in an error:
>
> $CHPL_HOME/modules/standard/IO.chpl:3743: error: sync variables cannot
> currently be written - apply readFE/readFF() to those variables first
>
> What is wrong?
>
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