Multi-processor caches with large granularity exclusivity locking
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United States of America Patent
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May 11, 1993
Issued Date -
N/A
app pub date -
Jul 9, 1992
filing date -
Feb 22, 1989
priority date (Note) -
Expired
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Abstract
A tightly coupled multi-processor (MP) system is provided with large granularity locking of exclusivity in multi-processor caches. The unique access right for a processor P.sub.i is enforced by giving other central processors (CPs) a temporarily invalid (TI) state on block B, even though some lines in the block B may still be resident in the cache. Any CP trying to access a block in the TI state will need to talk to the storage control element (SCE) to obtain proper authorization (e.g., RO or EX state) on the block. Assuming that a CP may have three states on a block B, temporarily invalid TI.sub.B, read only RO.sub.B and exclusive EX.sub.B, TI.sub.B is the initial state for all B at all CPs.
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