bug: lock request operations, and returning failure

[mpichbot]

Originally by dinan on 2012-11-12 14:44:22 -0600

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Lock request operations currently cannot fail at the target and return a failure response to the origin. Because of this, we're not able to properly handle many cases of incorrect passive target usage.

One such example is attached.

[mpichbot]

Originally by dinan on 2012-11-12 14:46:07 -0600

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Attachment added: win_sync_lock_fence2.c (1.7 KiB) This example forces and incorrect interleaving of active target (fence) and passive target epochs.

[mpichbot]

Originally by dinan on 2012-11-12 14:46:15 -0600

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Attachment added: win_sync.h (1.8 KiB)

[hzhou]

Confirmed. Lock request should return failure (via active message ACK) if there it is received inside a pending fence.