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Prevent forward events from overtaking cancel events. #123

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Prevent forward events from overtaking cancel events. #123

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Commits on Jul 29, 2017

  1. Prevent forward events from overtaking cancel events. 

    Add compile time option to stop sending of events from a PE if a cancel event is
being held for its corresponding forward event from being sent.

cmake option: PRIORITIZE_CANCEL_EVENTS
default value: OFF

This is still no fool-proof because on the receive side, MPI_Testsome may
succeed for events sent later. However, for small messages that ROSS usually
sends (<1 KB), this is unlikely.

Change-Id: I2800a2a6d3537317c6182047ff0beeb3ba238037
    @nikhil-jain
    nikhil-jain committed Jul 29, 2017
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