Agreed -- I think it's a bug and we should fix it asap.

Best,
 Torsten

On Mon, Aug 19, 2013 at 03:47:39PM -0500, Rajeev Thakur wrote:

It is still disallowed in MPI-3 by this sentence

pg 437, ln 28: Distinct access epochs for win at the same process must be disjoint.

On Aug 19, 2013, at 3:13 PM, Jim Dinan wrote:

Jeff,

With apologies if I have misunderstood your question.  To clarify, the example Rajeev gave was forbidden in MPI-2.  One could not have concurrent passive target access epochs, even if they accessed different targets.  It is allowed in MPI-3.

~Jim.

On Mon, Aug 19, 2013 at 3:52 PM, Jeff Hammond <jeff.science@gmail.com> wrote:

you mean lock at those ranks, not by those ranks?  those aren't conflicting so i don't see the issue.  maybe i am a dolt though.

jeff

On Mon, Aug 19, 2013 at 2:44 PM, Rajeev Thakur <thakur@mcs.anl.gov> wrote:

Did we make any change in MPI 3.0 to allow nesting of MPI_Win_lock calls? For example,

Win_lock(rank 1)

   Win_lock(rank 2)

   Win_unlock(rank 2)

Win_unlock(rank 1)

I can't find the text we added or deleted to allow this.

But I do see text that disallows this:

pg 437, ln 28: "Distinct access epochs for win at the same process must be disjoint."

Rajeev

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