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X indicates incompatibility, i.e, a case when a lock of the first type (in left column) on an object blocks a lock of the second type (in top row) from being acquired on the same object (by another transaction). An object typically has a queue of waiting requested (by transactions) operations with respective locks.
Concurrent object-oriented programming is a programming paradigm which combines object-oriented programming (OOP) together with concurrency.While numerous programming languages, such as Java, combine OOP with concurrency mechanisms like threads, the phrase "concurrent object-oriented programming" primarily refers to systems where objects themselves are a concurrency primitive, such as when ...
In computing, Common Object Request Broker Architecture (CORBA) is a standard for software componentry, created and controlled by the Object Management Group (OMG). Articles in this category either describe the details of the CORBA standard or are otherwise CORBA related.
A concurrent system is one where a computation can advance without waiting for all other computations to complete. [1] Concurrent computing is a form of modular programming. In its paradigm an overall computation is factored into subcomputations that may be executed concurrently.
Concurrency control in Database management systems (DBMS; e.g., Bernstein et al. 1987, Weikum and Vossen 2001), other transactional objects, and related distributed applications (e.g., Grid computing and Cloud computing) ensures that database transactions are performed concurrently without violating the data integrity of the respective ...
Then, if an exception is thrown, the runtime system looks up the current instruction location in the tables and determines what handlers are in play and what needs to be done. This approach minimizes executive overhead for the case where an exception is not thrown.
To restate; every object (P) has a Timestamp (TS), however if transaction T i wants to Write to an object, and the transaction has a Timestamp (TS) that is earlier than the object's current Read Timestamp, TS(T i) < RTS(P), then the transaction is aborted and restarted. (This is because a later transaction already depends on the old value.)
Stateless Session Beans [11] are business objects that do not have state associated with them. However, access to a single bean instance is still limited to only one client at a time, concurrent access to the bean is prohibited. [8] If concurrent access to a single bean is attempted, the container simply routes each request to a different ...