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

[Pavan Balaji]

On 05/20/2013 11:16 AM US Central Time, Fab Tillier wrote:
> In MPI-3, section 8.7.1 (page 363) states that delete callbacks are
> invoked on MPI_COMM_SELF before anything else happens, and that
> MPI_FINALIZED will return false from any of these delete callbacks.
> There's no mention about attribute callbacks on other built-in
> communicators, and no mention of behavior for built-in types.  Likely
> they should be invoked too for consistency's sake.

I'd think not.  For built-in communicators, it makes sense since they
cannot be freed by the user.  For other communicators, it's the user's
responsibility to free them.  So the callbacks should be triggered at
that time.

> What's interesting is that this section states that there is an
> ordering enforced (reverse from the order in which they are set),
> while MPI_COMM_FREE (page 248) states that the callbacks are invoked
> in arbitrary order.
> 
> We should probably make that consistent, and to preserve backward
> compatibility, the "arbitrary order" may have to become stricter for
> implementations to match the finalize behavior.

Gross.  Yes, I agree it should be consistent.

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji