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

[Jed Brown]

Pavan Balaji <balaji at mcs.anl.gov> writes:

> Can you point me to the appropriate location in the standard for this?
> All I can find is:
>
> "The comm_delete_attr_fn function is invoked when a communicator is
> deleted by MPI_COMM_FREE or when a call is made explicitly to
> MPI_COMM_DELETE_ATTR."

I don't think it explicitly says that the first argument to delete_fn is
valid, but the standard doesn't make a habit of reiterating when
arguments are valid.  What would be the purpose of passing a comm
argument that is going to be (sometimes?) invalid?

If you think it *should* be acceptable for an MPI implementation to pass
an invalid comm to delete_fn, such that compliant user code *must*
ignore that argument, then perhaps we should move the discussion to
mpi-forum and clarify the wording in the standard.