I believe that the copy and free attribute callbacks are intended to be local functions that deal with objects the user has attached as attributes, that might need to be copied or freed.  Can't find text that confirms this explicitly, though..


On Wed, Mar 5, 2014 at 6:31 PM, Balaji, Pavan <balaji@anl.gov> wrote:

The endpoints proposal says that Comm_free is not fully synchronizing.  What happens if I have an attribute callback on that communicator which does a Bcast?  How will that work?

  — Pavan

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