Motivated by the fact that concurrency, if not used properly and carefully, result in gigantic overhead and thus performance penalties compared to single-threaded systems, this tutorials examines how concurrency can be used effectively. We discuss concurrency issus at all levels of granularity, beginning from fundamental concurrency architectures, over desingning and implementing shared objects, to addressing low-level serialization and synchronization issues. In particular we present concrete patterns and techniques that let applications benefit from using multiple threads. Moreover, for every technique we discuss when it is most feasible, and when it should not be applied. To illustrate the patterns and techniques, we use concrete examples from the real-world. The tutorial concludes with a summary of our experiences in building concurrent systems. The tutorial covers most patterns of our book: Pattern-Oriented Software Architecture, Volume 2, Patterns for Concurrent and Networked Objects.

Reasonable knowledge in Object Technology.

Software-Engineers (professionals, students) who are interested in designing and implementing concurrent systems.

Frank Buschmann is senior principal engineer at Siemens Corporate Technology in Munich, Germany. His interests include Object Technology, Frameworks and Patterns. Frank has been involved in many software development projects. He is leading Siemens' pattern research activities. Frank is co-author of "Pattern-Oriented Software Architecture -- A System of Patterns" and "Pattern-Oriented Software Architecture -- Patterns for Concurrent and Networked Objects".