RTSJ Memory Areas and Their Affects on the Performance of a Flight-Like Attitude Control System

Niessner, Albert F.; Benowitz, Ed

doi:10.1007/978-3-540-39962-9_56

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…The design and implementation of RTSJ virtual machines have been documented in [11,17,2]. Several papers have reported on experience with programming with RTSJ [10,29,34,19,2].…”

Section: Related Work: Programming With Scoped Memorymentioning

confidence: 99%

“…So we must temporarily change allocation context. This is done by defining an inner class whose sole purpose is to create a new vector and add it to the hash map (lines [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The context switch is performed in lines 15-17 by first obtaining the area in which the StateTable was allocated, and finally executing the Putter in that area (line 17).…”

Section: Patterns and Idiomsmentioning

confidence: 99%

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Scoped types and aspects for real-time Java memory management

et al. 2007

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Abstract. Real-time systems are notoriously difficult to design and implement, and, as many real-time problems are safety-critical, their solutions must be reliable as well as efficient and correct. While higher-level programming models (such as the Real-Time Specification for Java) permit real-time programmers to use language features that most programmers take for granted (objects, type checking, dynamic dispatch, and memory safety) the compromises required for real-time execution, especially concerning memory allocation, can create as many problems as they solve. This paper presents Scoped Types and Aspects for Real-Time Systems (STARS) a novel programming model for real-time systems. Scoped Types give programmers a clear model of their programs' memory use, and, being statically checkable, prevent the run-time memory errors that bedevil the RTSJ. Adopting the integrated Scoped Types and Aspects approach can significantly improve both the quality and performance of a real-time Java systems, resulting in simpler systems that are reliable, efficient, and correct.

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“…The design and implementation of RTSJ virtual machines have been documented in [11,17,2]. Several papers have reported on experience with programming with RTSJ [10,29,34,19,2].…”

Section: Related Work: Programming With Scoped Memorymentioning

confidence: 99%

Section: Patterns and Idiomsmentioning

confidence: 99%

Scoped types and aspects for real-time Java memory management

et al. 2007

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“…In safety-critical Java (SCJ), memory management is the explicit responsibility of the application developer who has to be aware of the allocation context of objects. Maintaining referential integrity and the movement of data between memory areas are two of the most important issues introduced by the scoped model [13].…”

Section: Introductionmentioning

confidence: 99%

Patterns for safety-critical Java memory usage

Rios

Nilsen²,

Schoeberl

2012

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

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Scoped memories are introduced in real-time Java profiles in order to make object allocation and deallocation time and space predictable. However, explicit scoping requires care from programmers when dealing with temporary objects, passing scope-allocated objects as arguments to methods, and returning scope-allocated objects from methods. To simplify the correct usage of scopes, programming patterns may be helpful. We present patterns for simple subroutines, sequences of subroutine calls, and nested calls, where the patterns avoid memory leaks and unnecessary copying of values. The patterns are illustrated by implementations in the safety-critical Java profile.

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“…Any reference assignment must ensure that the referred object has a lifetime at least as long as that of the target of the assignment. Scoped memories are thus safer than explicit memory management, but still hard to use correctly [20,23]. An alternative that is an active area of research is garbage collection algorithms with real-time guarantees.…”

Section: Introductionmentioning

confidence: 99%

Scheduling of hard real-time garbage collection

Schoeberl

2010

Real-Time Syst

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Automatic memory management or garbage collection greatly simplifies development of large systems. However, garbage collection is usually not used in real-time systems due to the unpredictable temporal behavior of current implementations of a garbage collector. In this paper we propose a real-time garbage collector that can be scheduled like a normal real-time thread with a deadline monotonic assigned priority. We provide an upper bound for the collector period so that the application threads will never run out of memory. Furthermore, we show that the restricted execution model of the Safety Critical Java standard simplifies root scanning and reduces copying of static data. Our proposal has been implemented and evaluated in the context of the Java processor JOP.

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RTSJ Memory Areas and Their Affects on the Performance of a Flight-Like Attitude Control System

Cited by 9 publications

References 3 publications

Scoped types and aspects for real-time Java memory management

Scoped types and aspects for real-time Java memory management

Patterns for safety-critical Java memory usage

Scheduling of hard real-time garbage collection

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