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| • | If the line is
exclusive (i.e. dirty bit is set) no message is |
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| required |
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| • | Else send a
write-request to the home |
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| – | Home sends an
invalidation message down the chain |
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| – | Each copy is
invalidated (other than that of the requester) |
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| – | Final node in
chain acknowledges the requester and the home |
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| • | Chain is locked
for the duration of the invalidation |
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