scholarly journals Cl�opatre:Open-source Operating System Facilities for Real-Time Embedded Applications

2007 ◽  
Vol 15 (2) ◽  
pp. 131
Author(s):  
Maryline Silly-Chetto ◽  
Thibault Garcia-Fernandez ◽  
Audrey Marchand
Keyword(s):  
Operating System ◽  
Real Time ◽  
Embedded Applications

Rtkaller: State-aware Task Generation for RTOS Fuzzing

2021 ◽  
Vol 20 (5s) ◽  
pp. 1-22
Author(s):  
Yuheng Shen ◽  
Hao Sun ◽  
Yu Jiang ◽  
Heyuan Shi ◽  
Yixiao Yang ◽  
...  
Keyword(s):  
Operating System ◽  
Real Time ◽  
Parallel Execution ◽  
Code Coverage ◽  
Branch Coverage ◽  
Code Base ◽  
Time Requirements ◽  
Real Time Information ◽  
Embedded Applications ◽  
Time Information

A real-time operating system (RTOS) is an operating system designed to meet certain real-time requirements. It is widely used in embedded applications, and its correctness is safety-critical. However, the validation of RTOS is challenging due to its complex real-time features and large code base. In this paper, we propose Rtkaller , a state-aware kernel fuzzer for the vulnerability detection in RTOS. First, Rtkaller implements an automatic task initialization to transform the syscall sequences into initial tasks with more real-time information. Then, a coverage-guided task mutation is designed to generate those tasks that explore more in-depth real-time related code for parallel execution. Moreover, Rtkaller realizes a task modification to correct those tasks that may hang during fuzzing. We evaluated it on recent versions of rt-Linux, which is one of the most widely used RTOS. Compared to the state-of-the-art kernel fuzzers Syzkaller and Moonshine, Rtkaller  achieves the same code coverage at the speed of 1.7X  and 1.6X, gains an increase of 26.1% and 22.0% branch coverage within 24 hours respectively. More importantly, Rtkaller  has confirmed 28 previously unknown vulnerabilities that are missed by other fuzzers.

scholarly journals A Real time ZigBee Based Locating System

2011 ◽  
pp. 34-40
Author(s):  
D. Rakesh ◽  
R. Vignesh
Keyword(s):  
Operating System ◽  
Real Time ◽  
High Performance ◽  
Low Cost ◽  
Windows Ce ◽  
Embedded Operating System ◽  
Wireless Data ◽  
Reduced Instruction Set Computer ◽  
Locating System ◽  
Embedded Applications

Embedded Systems based on ARM processors are used extensively in mobile devices like PDA’s and MP3 players.ARM is 32bit Reduced Instruction Set Computer(RISC).Windows CE is real time, multi-task operating system that works on a 32-bit processor. This paper suggests Windows CE embedded operating system, and how to build a platform for Windows CE operating system embedded in a LS5310 ARM11 microprocessor S3C6410 and also the design of Windows CE embedded applications based on Embedded VC++ 4.0. Here we are employing RS232 serial port of ARM 11 processor and ZigBee wireless data communications module to design an application for a ZigBee location system with an easy-to-use interface. It performs multiple functions like information and data receiving, saving, processing and display. It has advantages of high performance, low cost, and low power consumption and is an important component of the network locating system.

scholarly journals An Adaptive Scheduler for Real-Time Operating Systems to Extend WSN Nodes Lifetime

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Roberto Rodriguez-Zurrunero ◽  
Ramiro Utrilla ◽  
Elena Romero ◽  
Alvaro Araujo
Keyword(s):  
Operating System ◽  
Real Time ◽  
Operating Systems ◽  
Research Area ◽  
Rechargeable Batteries ◽  
Wireless Sensor ◽  
Portable Devices ◽  
Wireless Devices ◽  
Changing Environments ◽  
Tasks Scheduling

Wireless Sensor Networks (WSNs) are a growing research area as a large of number portable devices are being developed. This fact makes operating systems (OS) useful to homogenize the development of these devices, to reduce design times, and to provide tools for developing complex applications. This work presents an operating system scheduler for resource-constraint wireless devices, which adapts the tasks scheduling in changing environments. The proposed adaptive scheduler allows dynamically delaying the execution of low priority tasks while maintaining real-time capabilities on high priority ones. Therefore, the scheduler is useful in nodes with rechargeable batteries, as it reduces its energy consumption when battery level is low, by delaying the least critical tasks. The adaptive scheduler has been implemented and tested in real nodes, and the results show that the nodes lifetime could be increased up to 70% in some scenarios at the expense of increasing latency of low priority tasks.

scholarly journals Evaluating Latency in Multiprocessing Embedded Systems for the Smart Grid

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3322
Author(s):  
Sara Alonso ◽  
Jesús Lázaro ◽  
Jaime Jiménez ◽  
Unai Bidarte ◽  
Leire Muguira
Keyword(s):  
Operating System ◽  
Smart Grid ◽  
Real Time ◽  
Processing System ◽  
The Other ◽  
Programmable Logic ◽  
Detailed Characterization ◽  
Timing Constraint ◽  
Time Part

Smart grid endpoints need to use two environments within a processing system (PS), one with a Linux-type operating system (OS) using the Arm Cortex-A53 cores for management tasks, and the other with a standalone execution or a real-time OS using the Arm Cortex-R5 cores. The Xen hypervisor and the OpenAMP framework allow this, but they may introduce a delay in the system, and some messages in the smart grid need a latency lower than 3 ms. In this paper, the Linux thread latencies are characterized by the Cyclictest tool. It is shown that when Xen hypervisor is used, this scenario is not suitable for the smart grid as it does not meet the 3 ms timing constraint. Then, standalone execution as the real-time part is evaluated, measuring the delay to handle an interrupt created in programmable logic (PL). The standalone application was run in A53 and R5 cores, with Xen hypervisor and OpenAMP framework. These scenarios all met the 3 ms constraint. The main contribution of the present work is the detailed characterization of each real-time execution, in order to facilitate selecting the most suitable one for each application.

Real-Time Operating System Standards

1991 ◽  
Vol 24 (2) ◽  
pp. 25-26
Author(s):  
C.D. Locke ◽  
R.P. Cook ◽  
K.D. Gordon ◽  
H. Tokuda
Keyword(s):  
Operating System ◽  
Real Time ◽  
Real Time Operating System
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