Support for hierarchical scheduling in FreeRTOS

Inam, Rafia; Mäki-Turja, Jukka; Sjödin, Mikael; Ashjaei, Mohammad; Afshar, Sara

doi:10.1109/etfa.2011.6059016

Cited by 32 publications

(39 citation statements)

References 9 publications

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“…Communication from Task3 to Task2 and Task4 using mailbox is shown in Fig. 12 (Inam et al, 2011). 6. RESULT Table 4 shows the arrival and burst time for various tasks.…”

Section: Realtime Implementationmentioning

confidence: 99%

Rtos Implementation of Non-Linear System Using Multi Tasking, Scheduling and Critical Section

Sujitha¹,

Kannan²,

Ravi³

2014

Journal of Computer Science

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RTOS based embedded systems are designed with priority based multiple tasks. Inter task communication and data corruptions are major constraints in multi-tasking RTOS system. This study we describe about the solution for these issues with an example Real-time Liquid level control system. Message queue and Mail box are used to perform inter task communication to improve the task execution time and performance of the system. Critical section scheduling is used to eliminate the data corruption. In this application process value monitoring is considered as critical. In critical section the interrupt disable time is the most important specification of a real time kernel. RTOS is used to keep the interrupt disable time to a minimum. The algorithm is studied with respect to task execution time and response of the interrupts. The study also presents the comparative analysis of the system with critical section and without critical section based on the performance metrics.

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“…Communication from Task3 to Task2 and Task4 using mailbox is shown in Fig. 12 (Inam et al, 2011). 6. RESULT Table 4 shows the arrival and burst time for various tasks.…”

Section: Realtime Implementationmentioning

confidence: 99%

Rtos Implementation of Non-Linear System Using Multi Tasking, Scheduling and Critical Section

Sujitha¹,

Kannan²,

Ravi³

2014

Journal of Computer Science

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“…In the executable form, the RVN is constructed by mapping the set of tasks (synthesized from ProSys-runnable components) to a server and assigning scheduling parameters (assignment of task-priorities) during the first-step of deployment. Internal validity of the timing-constraints of the RVN can then be assessed using, e.g., simulation, testing or a local schedulinganalysis provided in [7]. In this manner, after configuration the RVN-server preserves its timing properties within it.…”

Section: B the Rvn Concept In The Procom Component Modelmentioning

confidence: 99%

“…The official release of FreeRTOS only supports a single level fixed-priority scheduling. We have, however, previously presented an implementation of two-level HSF for FreeRTOS [6] with associated primitives for hard real-time sharing of resources both within and between servers [7]. The HSF implementation supports two kinds of servers, idling periodic [8] and deferrable servers [9].…”

Section: The Runnable Virtual Node (Rvn)mentioning

confidence: 99%

“…Thus some synchronization protocols for hierarchical schedulers are required to access the buffers in a safe manner. SRP and HSRP protocols are implemented in the HSF implementation [7]. The shared buffers among the tasks of same RVN and among tasks of different RVNs are arbitrated using SRP and HSRP respectively.…”

Section: B Server-based Communication Strategymentioning

confidence: 99%

“…The HSF supports CPU resource reservations by associating a tuple Q, P to each server, where P is the server period and the server budget Q (0 < Q ≤ P ) is the allocated portion of CPU resources every P . Given Q, P , and information on resource holding times, the schedulability of a server and/or a whole system can be calculated with the methods presented in [7].…”

Section: The Runnable Virtual Node (Rvn)mentioning

confidence: 99%

See 2 more Smart Citations

Implementing and evaluating communication-strategies in the ProCom component technology

Inam

Sjödin

2012

SIGBED Rev.

Self Cite

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This is an accepted version of a paper published in Acm Sigbed Review. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Abstract-This paper presents two strategies to support communication between real-time executable Runnable Virtual Node (RVN) components in the ProCom component technology. We describe the currently implemented server-based communication strategy which uses a dedicated server for communication. We compare the server-based technique with a direct (RVN-to-RVN) communication strategy. The paper also describes how these strategies could be evaluated for real-time performance, and the real-time analysis technologies needed to perform such an evaluation.

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Resource partitioning for Integrated Modular Avionics: comparative study of implementation alternatives

Han

Jin

2013

Softw. Pract. Exper.

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Most current generation avionics systems are based on a federated architecture, where an electronic device runs a single software module or application that collaborates with other devices through a network. This architecture makes the software development process very simple, but the hardware system becomes very complicated and it is difficult to resolve issues of size, weight, and power efficiently. An integrated architecture can address the size, weight, and power issues and provide better software reusability, testability, and reliability by means of partitioning. Partitioning provides a framework that can transparently integrate several real‐time applications on the same computing device, allowing the isolation of the execution environment in terms of resources and faults. Several studies on partitioning software platforms have been reported; however, to the best of our knowledge, extensive comparison and analysis of design and implementation alternatives have not been conducted owing to the extreme complexity of their implementation and measurement. In this paper, we present three design alternatives for partitioning at the user, kernel, and virtual machine monitor levels, which are compared quantitatively. In particular, we target the worldwide standard software platform for avionics systems, that is, Aeronautical Radio, Incorporated Specification 653 (ARINC 653). Overall, our study provides valuable design references and demonstrates the characteristics of design alternatives. Copyright © 2013 John Wiley & Sons, Ltd.

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Support for hierarchical scheduling in FreeRTOS

Cited by 32 publications

References 9 publications

Rtos Implementation of Non-Linear System Using Multi Tasking, Scheduling and Critical Section

Rtos Implementation of Non-Linear System Using Multi Tasking, Scheduling and Critical Section

Implementing and evaluating communication-strategies in the ProCom component technology

Resource partitioning for Integrated Modular Avionics: comparative study of implementation alternatives

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