Multiple concurrency control policies in an object-oriented programming system

The transaction model provides a good solution to many programming problems, but has been recognized as too strict for many applications. Different parallel and distributed applications have different consistency requirements, so multiple concurrency control policies are needed. When data is shared among applications with different policies, then the policies must operate simultaneously and compatibly. The authors investigate the interoperability of transactions and another consistency model, atomic blocks, which provide exclusive access to an individual object. They explore the implications of `uncontrolled´ concurrency within the same COOPS. The work has been in the context of the MELD object-oriented programming language