(j3.2006) Synchronization, allocation, and deallocation of coarray subcomponents
Bill Long
longb
Fri Apr 10 19:26:30 EDT 2009
Van Snyder wrote:
> 6.7.3.2p12 [133:20-21] says that implicit synchronization occurs when a
> coarray subcomponent is automatically deallocated as a consequence of
> execution of a RETURN or END statement or a statement that causes
> termination of a BLOCK construct. Is this true?
Yes. Implicit synchronization occurs whenever a coarray is deallocated.
> And what does "coarray
> subcomponent" mean here anyway? Is it "subcomponent that is a coarray"
>
Yes.
> or "subcomponent of a coarray,
No.
> which cannot be a coarray"? Why doesn't
> "deallocation of a coarray" just cover this?
>
Probably does.
> Is a subcomponent of an object ever implicitly deallocated without the
> object itself being deallocated (6.7.3.2p2-3 don't say so)?
>
>
Yes. See p6 in the same section.
> Does deallocating a subcomponent of a coarray by a DEALLOCATE statement
> cause synchronization (6.7.3.2p11 doesn't say so)?
>
No. Such components are local to the image, and need not have
corresponding components allocated on other images. Their allocation and
deallocation is local.
> Does allocating a subcomponent of a coarray by an ALLOCATE statement
> cause synchronization (6.7.1.2p4 doesn't say so)?
>
No. Same reason as above.
Cheers,
Bill
--
Bill Long longb at cray.com
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