A compatible reference would be a read or read-prefetch while a read or read-exclusive was outstanding, or a read-exclusive or
exclusive-prefetch while a read-exclusive was outstanding.
6.5 Protocol General Exceptions
In addition to the various request flows illustrated in the previous sections, there are six
exceptions that can occur whUe satisfying any request. The first two are related to allocating
a RAC buffer when a remote request is first issued. The third and fourth occur because of
seriahzation constraints and the potential interleaving of
requests.
The fifth exception is the
deadlock-breakin ...
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