JSR-282 status report

Dibble, Peter; Wellings, Andy

doi:10.1145/1620405.1620431

Cited by 13 publications

(4 citation statements)

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“…Although the current official release of the RTSJ does not support multiprocessor platforms explicitly, the next release of RTSJ 1.1 [11], developed from JSR-282 [10], is currently in alpha stage and that includes processor affinity and pinning features to support such platforms by default.…”

Section: Middleware Frameworkmentioning

confidence: 99%

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A framework accommodating categorized multiprocessor real-time scheduling in the RTSJ

Kwon

Cho

Ravindran

2012

Proceedings of the 10th International Workshop on Java Technologies for Real-Time and Embedded Systems

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In this paper, we present a framework for various multiprocessor scheduling algorithms by minimal modification of current RealTime Specification for Java (RTSJ) [6]. Although the current version of RTSJ provides a secure platform and rich functionalities for real-time Java applications, it lacks multiprocessor support mechanisms, e.g., absence of functions to support processor affinity, to efficiently utilize multiple processing resources. For this reason, we establish a multiprocessor-aware scheduling framework by using system calls of operating systems to make use of processor affinity, FIFO scheduler, scheduling parameter settings, and precision sleep timer functions. In addition to the framework, we also take categorization taxonomy introduced by Carpenter et al. in [1], which generalizes multiprocessor scheduling algorithms on two criteria of migration degrees and priority change complexity. Then our experimental evaluation on the framework with each scheduler class in the categorization taxonomy shows the framework's runtime overhead, which proves the feasibility of our implementation.

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Section: Middleware Frameworkmentioning

confidence: 99%

“…This suggestion was soon included in JSR 282 [10] and implemented in alpha version of RTSJ 1.1 [11].…”

Section: Introductionmentioning

confidence: 99%

A framework accommodating categorized multiprocessor real-time scheduling in the RTSJ

Kwon

Cho

Ravindran

2012

Proceedings of the 10th International Workshop on Java Technologies for Real-Time and Embedded Systems

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“…The next version of the RTSJ will provide more support for multiprocessor implementations including the ability to set the affinity of a thread 35. The SCJ specification restricts the model as follows: Level 0 supports essentially a single processor. Level 1 requires fully partitioned scheduling where a handler can only execute on a given processor.…”

Section: Removing the Inconsistency/incompatibilitymentioning

confidence: 99%

Asynchronous event handling and Safety Critical Java

Wellings¹,

Kim²

2011

Concurrency and Computation

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SUMMARY Over the last few years, the Java Community Process (under the auspices of Java Specification Request 302) has been developing a subset of Java augmented by the Real‐Time Specification for Java (RTSJ) for use in safety critical systems. The concurrency model supported by Safety Critical Java (SCJ) relies almost exclusively on an event‐based model rather than on a thread‐based model. This paper reviews the advantages and disadvantages of the two models and gives the pragmatic reasons that SCJ has adopted the former model. It describes the SCJ approach and gives a simple example of how it can be used, illustrating the difference in style between the RTSJ and SCJ code. The paper then considers the compatibility of the SCJ model with the RTSJ. It argues that by basing the SCJ classes on the RTSJ's BoundAsyncEvent class, some inconsistencies exist between the SCJ and the RTSJ models. Furthermore, some of the optimizations that are possible when mapping handlers to server threads are inhibited, even though the programming restrictions necessary for these optimizations are imposed by the SCJ specification. A revised model is presented that has a slightly more complicated API but is more consistent with the RTSJ and allows the optimizations. However, there is a resulting increase in the necessary run‐time support, particularly for multiprocessor implementations. Copyright © 2011 John Wiley & Sons, Ltd.

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“…The RTSJ (The Real-Time Specification for Java), originally formulated by JSR-1 [3] and currently in revision by JSR-282 [4], and its currently available implementations [5][6] [7], provide Java and the JVM with the resources required for an efficient development of real-time applications oriented to a wide spectrum of industrial domains. Some of these resources are: real-time threads with fixed-priority based schedulers, memory management techniques that guarantee predictability, synchronization mechanisms that avoid priority inversion, efficient management of external events and asynchronous control transfer mechanisms, and a wide set of real-time patterns that are already incorporated in the language [8].…”

Section: Introductionmentioning

confidence: 99%

Framework for the Design of Java Firm Real-time Systems Oriented to the Generation of Timing Behaviour Models

Martínez

Lanza

Drake

et al. 2013

2013 39th Euromicro Conference on Software Engineering and Advanced Applications

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This work proposes a framework for the design of complex Java firm real-time applications that run on embedded systems. The framework simplifies the real-time patterns included in the Real-Time Specification for Java (RTSJ) with the aim of systematizing the process of modelling and configuring the scheduling of real-time object-oriented applications. Moreover, with the proposed strategy, the designer of a real-time application can automatically obtain the timing behaviour model of the application, which is used to analyse and/or configure its schedulability so that it can be executed on an embedded system meeting its firm real-time requirements. The framework supports the design of applications whose real-time tasks interact asynchronously with non real-time ones.

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JSR-282 status report

Cited by 13 publications

References 0 publications

A framework accommodating categorized multiprocessor real-time scheduling in the RTSJ

A framework accommodating categorized multiprocessor real-time scheduling in the RTSJ

Asynchronous event handling and Safety Critical Java

Framework for the Design of Java Firm Real-time Systems Oriented to the Generation of Timing Behaviour Models

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