Analysis of Real-Time Systems Sensitivity to Transient Faults Using MicroC Kernel

A real-time operating system (RTOS) provides a platform for the design and implementation of a wide range of applications in real-time systems, embedded systems, and mission-critical systems. This paper presents a formal design model for a general RTOS known as RTOS+ that enables a specific target RTOS to be rigorously and efficiently derived in real-world applications. The methodology of a denotational mathematics, Real-Time Process Algebra (RTPA), is described for formally modeling and refining architectures, static behaviors, and dynamic behaviors of RTOS+. The conceptual model of the RTOS+ system is introduced as the initial requirements for the system. The architectural model of RTOS+ is created using RTPA architectural modeling methodologies and refined by a set of Unified Data Models (UDMs). The static behaviors of RTOS+ are specified and refined by a set of Unified Process Models (UPMs). The dynamic behaviors of the RTOS+ system are specified and refined by the real-time process scheduler and system dispatcher. This work is presented in two papers; the conceptual and architectural models of RTOS+ is described in this paper, while the static and dynamic behavioral models of RTOS+ will be elaborated in a forthcoming paper.

With the wide-spread using of LinuxOS, the Real-time requirement in certain applications is heighly demanded. So the Xenomai comes up, it has a higher priority than Linux kernel, so it can deal with the tasks which need real-time requirement.In order to set up the real-time Linux based on the ARM platform, the mini2440 development board contained s3c2440 as its MCU is used to set up the real-time operation system. Design and test the performs of the system. The results show that the embeded real-time Linux system based on the Xenomai has the good quality of real-time and can be used in the soft real-time system or the hard real-time system.

Time is the best important resource in real-time video image processing system. Only few structure or algorithm can be used in real-time video image processing system because of time limitation. Establish a high speed data-access is a way to this problem. It transfer the video signal between output ports and kernel processor as less time delay. The mode, look-up-table, other analysis, adjustment or calculation rule will be applied first by medium or low data-access. We can choose different data-access according to data relation level. Data which has closer correlation will be treated through low-speed-access, which has loser correlation will be treated through medium-speed-access. Theory analysis and experiment showed that it is a high effective structure for real-time video image processing. The feature of video image and real-time processing system is presented in this paper. The basic theory of data-access is introduced also. The status and relation of high, medium, low data-access is discussed and the rules of data distribution in different access is analyzed. Some examples with datas-accesses are given in the paper (TV tracking and measuring, laser signal alarming system).

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The tight coupling between system and market operations implies that there are strong interrelationships between system security management and market performance. Therefore, the assurance by the regional transmission organization (<emphasis emphasistype="boldital">RTO</emphasis>) of secure system operations strongly depends on, and directly impacts, electricity markets. Typically, electricity is traded in a sequence of markets that are cleared at different frequencies and with different lead times. In this paper, we focus on the hourly day-ahead markets (<emphasis emphasistype="boldital">DAM</emphasis>s) and their associated real-time markets (<emphasis emphasistype="boldital">RTM</emphasis>s) that clear, typically, every 5 to 10 min. The <emphasis emphasistype="boldital">DAM</emphasis>s' clearing impacts the nature and the extent of the participants' responses to real-time conditions and, therefore, the real-time system operations, which, in turn, impact system security. The basic thrusts of this work are to quantitatively characterize the linkages between the real-time system security and the day-ahead markets as well as to investigate the role of the financial entities in a multi-settlement system. We develop a systematic approach that allows us to quantify the auction surplus attained through the multi-settlement system and evaluate the impacts of the <emphasis emphasistype="boldital">DAM</emphasis>s on market participants' bid/offer surpluses as well as on improving the ability to facilitate real-time secure power system operations. We illustrate the application of the approach on the large-scale ISO-NE multi-settlement system using the historical 2005–2006 data—the system model and the bids/offers submitted—and the actual market clearing methodology. The studies bear out the well known fact that the participation of financial entities leads to the convergence of the <emphasis emphasistype="boldital">DAM</emphasis> and the associated <emphasis emphasistype="boldital">RTM</emphasis> prices. Moreover, these studies also illustrate that such participation leads to improved forecasts of the real-time system operations, and consequently results in improving the assurance of system security. </para>

Digital controllers are increasingly designed and built using commercial off-the-shelf (COTS) hardware and software components. This is a result of the availability of high-performance, low-cost microcontrollers, specialized embedded processors, and various real-time operating systems (RTOSs). The wide selection of RTOSs does not necessarily translate into an increased availability of systems that are capable of facilitating the construction of controllers meeting the performance and stability requirements demanded by the mechatronics applications. A primary contributing factor to that disparity is that the design goals of many RTOSs focus on the overall system response time and may neglect other timing constraints in the controller.This chapter examines the major components of an RTOS and the implementation of the controller using those components from a computing science perspective. By introducing the various operating system concepts and the way in which these concepts affect the digital controller design, this chapter aims to aid control engineers in better understanding an RTOS. With this knowledge, design decisions can be made to compensate for the deficiencies in the underlying software platform. This chapter also provides a survey of the results of the various research topics in the field of computer-controlled systems design. The contribution of this chapter is its synthesis of topics from control engineering theory with concepts from real-time systems in the RTOS context. We thus aim to help the control engineer to develop a systematic approach to the implementation of control systems using either a COTS RTOS or an open source-based research RTOS.The main objective of this chapter is to assist the control engineer in architecting the controller implementation while taking into consideration the issues that are present in the underlying supporting RTOS, thus creating an optimal design.

9 - Software Structure of Controller

This paper introduces a vehicle door monitoring system based on a real-time operating system (RTOS) to improve vehicle safety and security. The system employs RTOS principles to manage concurrent tasks, ensuring deterministic responses and efficient handling of critical operations, including door status, controls locking mechanisms, manages ignition, and handles emergencies. In this, two critical emergency situations have been handled: a crash with the preceding vehicle and fire detection within the vehicle. Real-time sensor inputs are received from infrared sensors, a collision switch sensor, a fire sensor, and control buttons, with feedback provided to users via liquid-crystal display (LCD), a Global System for Mobile Communications (GSM) module, and Universal Asynchronous Receiver Transmitter (UART) interfaces. In emergency scenarios, the system performs prioritized tasks, sending Short Message Service (SMS) alerts to designated contacts, ensuring rapid and reliable communication. The RTOS framework enables task scheduling, interprocess communication, and resource management to ensure timely execution of safety-critical functions and minimize latencies. The implementation demonstrates the potential of RTOS in developing reliable and responsive safety systems, emphasizing its suitability for real-time vehicular applications.

The core idea in this project is to have two operating systems for both cores of dual core processor individually. General purpose operating system on one core and Real time operating system (RTOS) on second core. Implementation of same will be done by making one of core independent from General purpose operating system and install RTOS in that core so that both will work as one system i.e. General purpose operating system will look after the non-real time applications and RTOS will ensure that all real time application should not miss their deadline and executed as fast as they can. As by installing general purpose operating system and RTOS in both the cores of dual core processors of system and running them in parallel way, dual core processors is being used to its maximum efficiency. The advantage is that if one of OS gets crashed, whole system will not crash instead one of OS which didn't crash hold the system to safe mode till damaged OS is recovered.

Real-time Linux operating system for plasma control on FTU—implementation advantages and first experimental results

Many modern embedded applications need the execution support of a real-time operating system. Such applications have usually critical or hard timing requirements, but giving the high presence of multimedia devices, real-time operating systems can also be used to manage the tasks that execute within multimedia devices. This paper focuses on identifying the requirements of a real-time operating system capable of fulfilling the needs of the multimedia applications typically executed on multiprocessor, mobile-oriented systems such as the Movidius platform.

Real-time systems are those systems in which the correctness of the system depends not only on the logical results of computation but also on the time at which the results are produced [Stankovic 1988]. They span a broad spectrum of complexity from very simple microcontrollers in embedded systems (a microprocessor controlling an automobile engine) to highly sophisticated, complex, and distributed systems (air traffic control for the continental United States). Other real-time systems include command and control systems, process control systems, and multimedia and high-speed communication systems. Some real-time systems are beginning to add expert systems and other AI technology, creating additional requirements and complexities. At least three major trends in the real-time and embedded systems field have had a major impact on its technology: the increased growth and sophistication of embedded systems, the development of more scientific and technological results for hard real-time systems, and the advent of distributed multimedia. Most embedded systems consist of a small microcontroller and limited software situated within some product such as a microwave oven or automobile. However, with the increasing sophistication of such systems, powerful microcontrollers and digital signal processing (DSP) chips are commonly used, as are off-the-shelf real-time operating systems and design and debugging tools. Many people working with embedded systems deal on a daily basis with sensors and data acquisition technology and systems; others construct architectures based on single-board computers (many are still 68000-based, but RISC processors are being used more and more) and buses such as the VME bus. Many people are involved with the programming and debugging of embedded systems, largely using the C programming language and cross development and debugging platforms. Embedded systems may or may not have real-time constraints. Hard real-time systems are those in which missing an important deadline can cause severe consequences, even death. In this area, many fundamental results have been developed. For example, in real-time scheduling, rate monotonic analysis has enabled careful evaluation of many practical systems; the concept and analysis of competitive algorithms has provided important scheduling bounds and limits; and on-line planning has added flexible and dynamic capabilities to real-time systems. Operating systems research has produced predictable primitives, time-constrained synchronization techniques, and reservation and admission-control paradigms. Many other results exist in real-time architecture, fault tolerance, communication protocols, specification and design tools, formal verification, databases and object-oriented systems. Emphasis on all these areas is expected to increase in the foreseeable future. Many hard real-time systems are embedded systems. Distributed multimedia have produced a new set of soft real-time requirements. Real-time principles lie at the heart of distributed multimedia, but without the concomitant high reliability

Nowadays more and more embedded real-time applications use multithreading. The benefits of multithreading include better throughput, improved responsiveness, and ease of development. However, these benefits come with costs and pitfalls which are unacceptable for a typical hard real-time system. These costs are mainly caused by scheduling and context switching between threads. While different scheduling algorithms have been developed to improve the overall system performance, context switching still consumes lot of processor resources and presents a major overhead, especially for hard real-time applications. In this paper, we propose a new approach to improve the overall performance of embedded systems that use multithreading by moving the context switching component of the Real-Time Operating System (RTOS) to the processor hardware itself. This technique leads to savings of processor clock cycles used by context switching, which is a very important resource for a hard real-time embedded systems.

In an open real-time system,the coexistence of different kinds of real-time and non real-time applications makes the system scheduling mechanism face new requirements and challenges.One scheduling mechanism of the open systems was introduced,and that the nonpreemptable sections may influence system schedulability in non real-time applications scheduling was pointed out.And then,a scheme which can remedy the limitations about the previous scheduling scheme was presented and the two-level scheduling scheme of open real-time system was improved.Ultimately,the schedulability of hard real-time applications,soft real-time applications and non real-time applications was guaranteed.

Building Safety-Critical Real-Time Systems with Reusable Cyclic Executives

System design kit for the 8051