[mpich-discuss] [PATCH v2] test: add attrdeleteget, MPI_Attr_get called from delete_fn

[Jeff Squyres (jsquyres)]

On May 18, 2013, at 4:41 PM, Fab Tillier <ftillier at microsoft.com> wrote:

> I agree the standard should clarify (I'll take a look at the ticket you created), and I'd like to see a clarification of the behavior with respect to the attribute delete callbacks.  Specifically, the standard does not state explicitly whether the attributes are destroyed within the call to MPI_COMM_FREE, or only once all references on the communicator are released.  


Sorry for jumping in late...

I actually brought this exact issue up with the Forum a few years ago.  There's a few larger issues:

1. What exactly is allowed to be done in attribute callbacks (or any callbacks, actually) -- to include whether you can GET_ATTR, etc.
2. Is the Fortran attribute extra state parameter passed by value or by reference?

Sadly, it looks like I only made a ticket on #2: https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/159

But for #1, there was some web discussion about this, but the issue never really went anywhere.  Here's the first mail about it, from back in 2011:

    http://lists.mpi-forum.org/mpi-forum/2011/04/1035.php

-- 
Jeff Squyres
jsquyres at cisco.com
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