Multiprocessor system includes operating system for notifying only those cache managers who are holders of shared locks on a designated page by global lock manager
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United States of America Patent
Stats
-
Jul 6, 1993
Grant Date -
N/A
app pub date -
Mar 14, 1990
filing date -
Mar 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A conditional broadcast or notification facility of a global lock manager is utilized to both serialize access to pages stored in local caches of counterpart processors in a distributed system and to ensure consistency among pages common to the caches. Exclusive use locks are obtained in advance of all write operations. When a page is to be updated, which page is cached in a processor other than that of the requester, then a delay is posed to the grant of the exclusive lock, all shared use lock holders to the same page notified, local copies are invalidated, exclusive lock granted, page is updated and written through cache, after which the lock is demoted to shared use.
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