Add nonblocking semantics to quilt spec #85
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This PR addresses issue #59.
Review from @kalzoo would be appreciated.
From what I could gather, the semantics of the non-blocking modifier is to not exclude the modified operation from simultaneous scheduling with operations on intersecting frames. But operations that are not non-blocking still exclude operations on intersecting frames in their usual way, including those frames marked as non-blocking.
I include @braised-babbage 's example in the spec to clarify that to make use of
NONBLOCKINGrequires modifying each operation meant to be mutually non-blocking.