In the current multi-core era, concurrency bugs are a serious threat to software reliability. As hardware becomes more parallel, concurrent programming will become increasingly pervasive. However, correct concurrent programming is known to be extremely challenging for developers and can easily lead to the introduction of concurrency bugs. This dissertation addresses this challenge by proposing ...

In order to understand the relative expressive power of larger concurrent programming languages, we analyze translations small process calculi which model communication and synchronization processes. The source language SYNCSIMPLE is a minimalistic for message passing concurrency while target LOCKSIMPLE shared memory concurrency. former calculus with synchronous processes, latter has synchroniz...

Concurrency theory, as developed by Carl Adam Petri, is an axiomatic theory of binary relations of concurrency (co) and causality (li). This work deals with interactions between axioms and studies properties of concurrency structures, the models of this theory. In contrast to other treatments concurrency theory will be investigated in its general form, which does not require an underlying parti...

BACKGROUND Although concurrent sexual partnerships may play an important role in HIV transmission in Africa, the lack of an agreed definition of concurrency and of standard methodological approaches has hindered studies. In a long-standing general population cohort in rural Uganda we assessed the prevalence of concurrency and investigated its association with sociodemographic and behavioural fa...

BACKGROUND Most studies that assess the relationship between concurrent sexual partnerships and sexually transmitted diseases (STDs) use dichotomous measures of whether concurrency was reported or not. However, different forms of concurrency have different degrees of associated risk for disease transmission, and this should be considered. This article examines variation in both individual concu...

The Java programming language supports concurrency. Concurrent programs are hard to test due to their inherent non-determinism. This paper presents a classification of concurrency failures that is based on a model of Java concurrency. The model and failure classification is used to justify coverage of synchronization primitives of concurrent components. This is achieved by constructing concurre...

Concurrency control is one of the main issues in the studies of real-time database systems. In this paper different distributed concurrency control methods are studied and evaluated in real-time system environment. Because optimistic concurrency control is promising candidate for real-time database systems, distributed optimistic concurrency control methods are discussed more detailed way. We p...

Concurrency on a massive scale is required to meet the needs of today’s increasingly distributed systems. To better understand how current concurrency control schemes work on distributed systems, this paper reports an evaluation of concurrency control schemes for online transaction processing (OLTP) workloads on distributed database management systems (DBMS) with a variable number of nodes. Fiv...

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the large number of applications manages time varying data. existing databasetechnology seldom supports temporal database, tdb, according to time aspects.these intrinsic temporal database applications rely on such database which storesand retrieves time referenced data. moreover, applications need to be managed oncommon data items access simultaneously and to be precluded from inconsistencyas s...