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Locking Protocol: Method to Ensure Concurrency in a File Access Processor Disclosure Number: IPCOM000036583D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29

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Barnes, CC Szczygielski, TJ [+details]


The basic purpose of a file access processor is to manage a set of objects (files within directories) for a set of users. These objects may be shared, requiring a high degree of concurrency for a file access processor. Because the environment allows sharing, a mechanism must be established that will ensure concurrency during sharing. This concurrency is based on a compatibility scheme devised for System R and Structured Query Language/Data System (SQL/DS) with the following extension: For each file define a logical object identifier. Hold locks on catalog (relational) rows only while obtaining the lock on the logical object and during commit.