I want it to be legal, don't think it's clear from the standard, and expect that pattern to break some implementations. What's the use case? Jeff Sent from my iPhone

On Jun 20, 2014, at 11:16 AM, "Balaji, Pavan" <[email protected]> wrote:

Is the following code correct? Two threads of a process both do the following:

MPI_PUT MPI_PUT MPI_WIN_FENCE

Collectives are not allowed on the same communicator simultaneously. But we don’t say anything similar for windows.

— Pavan

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