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Commit a8cec219 authored by Mark OLESEN's avatar Mark OLESEN
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ENH: add UPstream request cancellation (#2800) 

- useful when speculative receives have been initiated but are no
  longer required.

  Combines MPI_Cancel() + MPI_Request_free() for consistent resource
  management. Currently no feedback provided if the request was
  satisfied by a completed send/recv or by cancellation (can be added
  later if required).
parent f4df00a4
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