FSF: A Real-Time Scheduling Architecture Framework

Aldea, Mario; Bernat, Guillem; Broster, Ian; Burns, Alan; Dobrin, Radu; Drake, José M.; Fohler, Gerhard; Gai, Paolo; Harbour, Michael González; Guidi, Giacomo; Gutiérrez, Joaquín M.; Lennvall, Tomas; Lipari, Giuseppe; Martinez, J.; Medina, Julio; Palencia, J. Carlos; Trimarchi, Michael

doi:10.1109/rtas.2006.18

Cited by 26 publications

(20 citation statements)

References 22 publications

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“…For the purpose of demonstrating the ability to change the scheduling policy, we have implemented two extensions of the Rt_Glade_Scheduling package, one for the traditional fixed priority scheduling, but under the new approach, and the other one for a complex contract-based flexible scheduling policy [3]. The Create_Task operation creates an RPC handler task and sets its priority to the value specified in the Task_Scheduling_Parameters object.…”

Section: Implementation Of Specific Scheduling Policiesmentioning

confidence: 99%

“…The First Scheduling Framework (FSF) [3] is a framework for a scheduling architecture that provides the ability to compose several applications or components to build a real-time system, and to flexibly schedule the available resources while guaranteeing hard real-time requirements. It is is based on establishing service contracts that represent the complex and flexible requirements of the application, and which are managed by the underlying system to provide the required level of service.…”

Section: Implementation Of Specific Scheduling Policiesmentioning

confidence: 99%

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Interchangeable Scheduling Policies in Real-Time Middleware for Distribution

Campos

Gutiérrez

Harbour

2006

Reliable Software Technologies – Ada-Europe 2006

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Abstract. When a middleware layer is designed for providing semi-transparent distribution facilities to real-time applications, a trade-off must be made between the expressiveness and control capabilities of the real-time parameters used, and the simplicity of usage. Middleware specifications such as RT-CORBA or Ada's Distributed Systems Annex (DSA) rely on the use of priorities to map the timing requirements of the application, thus restricting the possible scheduling policies. This paper presents a generic technique to express complex scheduling and timing parameters of distributed transactions, allowing real-time middleware implementations to change their scheduling policies for both the processing nodes and the networks. The technique has been tested in an implementation of Ada's DSA, providing two interchangeable policies: a fixed-priority scheduler, and a complex contract-based flexible scheduler.

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Section: Implementation Of Specific Scheduling Policiesmentioning

confidence: 99%

Section: Implementation Of Specific Scheduling Policiesmentioning

confidence: 99%

Interchangeable Scheduling Policies in Real-Time Middleware for Distribution

Campos

Gutiérrez

Harbour

2006

Reliable Software Technologies – Ada-Europe 2006

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“…The technology incorporates mechanisms to the running environment, and extends the specification of the components, in such a way that the timing behaviour of the final application is totally controlled by the automatically generated execution environment. In this way, real-time models of the application can be elaborated and analysed in order to verify its schedulability when the application is run in closed platforms, or to define the resource usage contracts required to operate in open environments like FRESCOR [2] [5]. The description and deployment of applications and components in the technology follow the "Deployment and Configuration of Component-Based Distributed Applications" standard of the OMG [6] (D&C).…”

Section: Introductionmentioning

confidence: 99%

“…This model is used either to analyse the schedulability of the application under a certain workload, or to calculate the resource usage contracts necessary to guarantee its operation in an open contractual environment [5]. In the latter case, these contracts will be negotiated, prior to the application execution, by the launching tool.…”

Section: Introductionmentioning

confidence: 99%

An Ada 2005 Technology for Distributed and Real-Time Component-Based Applications

Martínez

Drake

Pacheco

et al.

Reliable Software Technologies – Ada-Europe 2008

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Abstract:The concept of interface in Ada 2005 significantly facilitates its usage as the basis for a software components technology. This technology, taking benefit of the resources that Ada offers for real-time systems development, would be suitable for component-based real-time applications that run on embedded platforms with limited resources. This paper proposes a model based technology for the implementation of distributed real-time component-based applications with Ada 2005. The proposed technology uses the specification of components and the framework defined in the LwCCM standard, modifying it with some key features that make the temporal behaviour of the applications executed on it, predictable, and analysable with schedulability analysis tools. Among these features, the dependency on CORBA is replaced by specialized communication components called connectors, the threads required by the components are created and managed by the environment, and interception mechanisms are placed to control their scheduling parameters in a per-transaction basis. This effort aims to lead to a new IDL to Ada mapping, a prospective standard of the OMG.

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“…To better handle the complexity of these systems, instead of asking the application to interact directly with the scheduling policies, scheduling services of a higher level of abstraction are being designed, usually based on the concept of resource reservations [2]. The FRESCOR European Union project [3] in which we are participating is aimed at investigating these aspects by creating a contract-based scheduling framework.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Distribution Middleware from the Ada Perspective

Benítez-Pérez

Gutiérrez

Sangorrin

et al.

Reliable Software Technologies – Ada-Europe 2008

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Abstract. Standards for distribution middleware sometimes impose restrictions and often allow the implementations to decide on aspects that are fundamental to the correct and efficient behaviour of the applications using them, especially when these applications have real-time requirements. This work presents a study of two standard approaches for distribution middleware that can be used from Ada applications: RT-CORBA, and the Distributed Systems Annex (DSA) of Ada. The study focuses on the problems associated with the real-time behaviour of some implementations of these approaches, and on possible solutions that can be derived from our experience with Ada implementations. Moreover, the paper considers the problem of integration of the distribution middleware with a new generation of scheduling mechanisms based on contracts.

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FSF: A Real-Time Scheduling Architecture Framework

Cited by 26 publications

References 22 publications

Interchangeable Scheduling Policies in Real-Time Middleware for Distribution

Interchangeable Scheduling Policies in Real-Time Middleware for Distribution

An Ada 2005 Technology for Distributed and Real-Time Component-Based Applications

Real-Time Distribution Middleware from the Ada Perspective

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