Report from the requirements group for real-time extensions for the Java platform

Carnahan, Lisa J.; Ruark, M

doi:10.6028/nist.sp.500-243

Cited by 14 publications

(9 citation statements)

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“…NIST published a document entitled Requirements for real-time extensions to the Java platform [31] from where two compliant specifications were latter produced: the Real-time Specification for Java (RTSJ) [26] and the Real-Time Core Extension Specification for the Java Platform (RT Core) [62]. Of these two specifications, the RTSJ received more attention both by academia and industry because RTSJ was initially supported by Sun Microsystems (now part of Oracle Inc.) and IBM.…”

Section: Java For Real-time Systemsmentioning

confidence: 99%

“…The modified version needs an additional parameter to set the size of the nested scope because the memory consumption of objects is implementation dependent. The run() method also handles the additional scope change needed to return the resulting string object into the context of the caller (lines [29][30][31][32][33][34]. The scope change is made using the SCJ's executeInOuterArea method, which moves the current allocation context one level up in the scope stack.…”

Section: Datainputstreammentioning

confidence: 99%

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Safety‐critical Java for embedded systems

Schoeberl

Dalsgaard

Hansen

et al. 2016

Concurrency and Computation

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Phone +45 4525 3351 compute@compute.dtu.dk www.compute.dtu.dk IMM-PhD-2014-340 Summary (English) Safety-critical systems are real-time systems whose failure can have severe or catastrophic consequences, possibly endangering human life. Many safety-critical systems incorporate embedded computers used to control different tasks. Software running on safety-critical systems needs to be certified before its deployment and the most time-consuming step of this process is the testing and verification phase. Due to the increasing complexity in safety-critical systems there is a need for new technologies that can facilitate testing and verification activities.The safety-critical specification for Java aims at providing a reduced set of the Java programming language that can be used for systems that need to be certified at the highest levels of criticality. Safety-critical Java (SCJ) restricts how a developer can structure an application by providing a specific programming model and by restricting the set of methods and libraries that can be used. Furthermore, its memory model do not use a garbage-collected heap but scoped memories.In this thesis we examine the use of the SCJ specification through an implementation in a time-predictable, FPGA-based Java processor. The specification is now in a mature state and with our implementation we have proved its feasibility in an embedded platform. Moreover, we have explored how simple hardware extensions can reduce the execution time of time-critical operations required by the SCJ specification.The scoped memory model used in SCJ is perhaps one of its most difficult features to use correctly. Therefore, in this work we have also studied practical aspects of its usage by developing scoped memory use patterns and reusable libraries aiming at facilitating the development of complex software systems.ii Summary (Danish)Sikkerhedskritiske systemer er realtidssystemer. Hvis sådanne systemer fejler, kan det have alvorlige eller katastrofale konsekvenser, muligvis livsfarlige konsekvenser. Mange sikkerhedskritiske systemer inkorporerer embeddede computere, som bruges til at kontrollere forskellige opgaver. Software, som kører på sikkerhedskritiske systemer, skal certificeres, før softwaren udrulles, og det mest tidskraevende skridt i denne proces er test-og verifikationsfasen. På grund af den stigende kompleksitet i sikkerhedskritiske systemer er der behov for nye teknologier til at facilitere test-og verifikationsaktiviteter.Den sikkerhedskritiske specifikation for Java har til formål at levere en reduceret udgave af Java-programmeringssproget, som kan bruges til systemer, der skal kunne certificeres på de højeste kritikalitetsniveauer. Safety Critical Java (SCJ) begraenser, hvordan en udvikler kan strukturere en applikation, ved at levere en specifik programmeringsmodel og ved at begraense de metoder og biblioteker, som kan anvendes. Derudover benytter hukommelsesmodellen i SCJ ikke en heap, der er garbage-collected, men afgraensede hukommelser.I denne afhandling undersøger vi brugen a...

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Section: Java For Real-time Systemsmentioning

confidence: 99%

Section: Datainputstreammentioning

confidence: 99%

Safety‐critical Java for embedded systems

Schoeberl

Dalsgaard

Hansen

et al. 2016

Concurrency and Computation

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“…In general, Java presents some problems regarding its use in embedded real-time environments. The National Institute of Standards and Technology (NIST) has produced a basic requirements document for a standard real-time Java API extension [1]. Where the memory management is one of the major issues that need research when considering the extension of Java for real-time.…”

Section: Introductionmentioning

confidence: 99%

Towards an Analysis of Garbage Collection Techniques for Embedded Real-Time Java Systems

Higuera-Toledano

2006

12th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA'06)

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“…This specification addresses the real-time Java requirements proposed by NIST [21] that were also aimed at limiting the required modifications to the JVM. To develop this specification, the RTJEG defines six guiding principles that in turn led to seven functional areas in which the extensions were defined.…”

Section: The Real-time Java Specification (Rtjs)mentioning

confidence: 99%

Chocolate: a reservation-based real-time Java environment on Windows/NT

Niz

Rajkumar²

Proceedings Sixth IEEE Real-Time Technology and Applications Symposium. RTAS 2000

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In this paper, we present Chocolate, a reservation-based Real-Time Java run-time environment that runs on Windows NT. We first present a brief overview of the emerging RealTime Java standard and the Resource Kernel (RK) approach to providing timely, guaranteed and enforced access to system resources. Chocolate is a real-time Java Virtual Machine that interfaces the real-time Java programming language with the abstractions of a resource kernel. It also supports memory regimes to control allocation time and a protocol to bound priority inversion. This version of Chocolate is implemented on top of NT/RK, an OS environment that includes a "portable resource kernel" within the NT kernel.Our detailed evaluation of Chocolate shows that the overhead introduced by NT/RK is acceptable. A Real-Time Java audio package on Chocolate demonstrates significantly better performance than its non-real-time counterpart.However, our Hartstone benchmark evaluations also show that our NT/RK implementation does have its drawbacks due to the lack of hard real-time capabilities within Windows NT.

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Report from the requirements group for real-time extensions for the Java platform

Cited by 14 publications

References 0 publications

Safety‐critical Java for embedded systems

Safety‐critical Java for embedded systems

Towards an Analysis of Garbage Collection Techniques for Embedded Real-Time Java Systems

Chocolate: a reservation-based real-time Java environment on Windows/NT

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