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Sergey Oblomov dea9cf6b63 OSHMEM: added processing of zero-length collectives
- according spec 1.4, annex C shmem collectives should process
  calls where number of elements is zero independently from pointer
  value
- added zero-count processing - it just call barrier to
  sync ranks

Signed-off-by: Sergey Oblomov <sergeyo@mellanox.com>
(cherry picked from commit 9de128afaf5224193a88f00c897f5d5c94336f99)
2018-11-27 14:26:44 +02:00
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