Abstract
Locking is a commonly used mechanism in Computer Supported Cooperative Work (CSCW) for coordinating concurrent users and implementing various styles of information sharing. Part of a sharing style's definition is the granularity of shared objects. Since this varies among different applications, it is desirable to provide a range of different lock granules. In this paper, I first examine existing multiple granularity locking protocols and I evaluate their suitability for CSCW. My main contribution is the development of a new such protocol specifically for CSCW, which provides versionable object locking, guarantees conflict freedom, prevents update loss and ensures greater concurrency than other locking protocols. Its suitability for CSCW is justified by a comparative performance analysis.
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