Embedded Computer Systems Real Time Operating System Characteristics

2708 words - 11 pages

Real Time Operating System CharacteristicsIntroductionReal-time operating systems or RTOS are an important class of operating systems. Like all operating systems, RTOS can be examined from a variety of perspectives, including theory and actual implementation. An RTOS is defined as...:"...the one in which the correctness of the computations not only depends upon the logical correctness of the computation but also upon the time at which the result is produced. If the timing constraints of the system are not met, system failure is said to have occurred."Examining existing RTOS reveals how real-time systems are implemented. There are dozens of real-time systems available for different platforms. Many manufacturers simply state that their operating systems are real-time without explaining how this is accomplished. One real-time system, QNX, offers more insight, however. This operating system will be examined in detail to explain how real-time processing works.QNX Real-time OSThe main responsibility of any operating system is to manage a computer's resources. Some system processes call for strict resource management and scheduling. These processes depend on the OS to handle multiple events and to ensure that the system responds to those events within predictable time limits. The QNX philosophy is that the more responsive the OS, the more "time" a real-time application has to meet its deadlines.QNX Software Systems Ltd develops real-time operating systems for personal computers. According to QNX:"The QNX Operating System is ideal for real-time applications. It provides multitasking, priority-driven pre-emptive scheduling and fast context switching - all essential ingredients of a real-time system."ArchitectureThe heart of the QNX OS is the Neutrino kernel. It can be scaled to very small sizes with a fully functional core kernel of only 12K. The Neutrino kernel conforms to the POSIX-standard API. Neutrino is also remarkably flexible. It can easily be customized to meet the needs of various environments. It can be configured as anything from very small system kernel with a few small modules to a full-blown network-wide system equipped to serve hundreds of users. This illustrates one of the unique qualities of Neutrino which lets you set up your system to use only those resources you require for the job at hand.Neutrino achieves its unique degree of efficiency, modularity and simplicity through two fundamental principles:a)microkernel architectureb)message-based inter-process communicationThe QNX microkernel however performs only four functions, including:*Inter-process communication: "The microkernel delivers all messages; it also manages two other forms of IPC: proxies and signals."*Low-level network communication: "The microkernel delivers all messages destined for processes on other nodes."*Process scheduling: "The microkernel's scheduler decides which process will be executed next."*First-level interrupt handling: "All hardware interrupts and faults...

Find Another Essay On Embedded Computer Systems Real Time Operating System Characteristics

DataStorm Project: Developing Integrated Real-Time Monitoring Framework for Cloud-Based Systems

588 words - 2 pages DataStorm project is developed by University of Stavanger (UiS) and Stanford University (SU) and is based on previous BioSTORM project. It aims at developing integrated real-time monitoring framework for cloud-based systems. BioSTORM (Biological Spatio-Temporal Outbreak Reasoning Module) project created ontology-driven framework for developing JADE agent systems. Project demonstrated that rich modeling environment that allowed for declarative

Has the lack of competition in the operating systems market harmed innovation in terms of the development of Window's operating system? In other words, is XP all it should be?

1365 words - 5 pages The basic issue posed in the above question is Microsoft's monopolistic practices with software run solely in their computer operating systems (OS). Can we afford to allow America's largest corporation to get away with monopolistic practices that will affect the entire computer software industry? To allow this, would create a legal precedent so strong that it will be impossible to stop or control any other monopolistic practices in all other

Certain Investigations on Real Time Measurement Systems Deploying Vibration Technique for Bone Quality Assessment

616 words - 3 pages Bone quality assessment is recognized as an important health issue in human life cycle particularly in women. By determining Bone Mineral Density of bone it is possible to detect and better diagnosis of bone disease such as Osteoporosis. DEXA (Dual Energy X-ray Absorptiometry) scan is considered as a conventional imaging system which is being practiced by clinicians for this purpose.. On viewing the image one can able to assess the condition of

Carson Stowe

914 words - 4 pages use (Shelly and Vermaat). A receipt received after making a purchase is a printed form of information. There are computers in traffic lights, mp3 players, toys, and most things electronic. These computers are called embedded systems. An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computer constraints. It is embedded as part of a complete device often including

Operating systems

1435 words - 6 pages , they actually have very little and no end-user utilities, since the system will be untouchable when delivered for use. A very important part of an RTOS is managing the resources of the computer so that a specific operation happens in precisely the same amount of time, every time it occurs. The system in a CNC machine computer is a great example of this (Coustan). Operating systems have advanced pretty juristically over the years


3451 words - 14 pages RTOS specification for embedded sys- tems resulting from the TRON (The Real-Time Operating System Nucleus) project. Participant companies that have implemented the specification include, Fujitsu, Hitachi, Mitsubhishi, Miyazaki, Morson, Erg Co., Firmware Sys- tems, NEC, Sony Corp., Three Ace Computer Corp., and Toshiba [10]. OSE: A commercial RTOS from Enea Data Systems that boasts to have bridged the gap between applications and the kernel by

Connor Jantzen

1068 words - 5 pages What is Operating Systems? An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. (wikipedia). That is what you would find on Wikipedia in my words it is what runs your computer really. Every computer has one at the bank they have one, big businesses have them so do burger king. There are many types of operating systems out there. Such as real-time

Power Optimisation

895 words - 4 pages -DVS technique is exploiting the hardware characteristics of processors to reduce energy dissipation by lowering the supply voltage and operating frequency. Pillai, Shin, & Arbor also show that this RT-DVS algorithm closely approach the theoretical lower bound on energy consumption, and can easily reduce energy consumption 20% to 40% in an embedded real-time system. On the other hand the later will be affected by lowering speed of the overall


1840 words - 7 pages Helios is a micro kernel operating system for embedded and multiprocessor systems. The operating system is modular in design and can scale from an embedded runtime executive up to a fully distributed operating system. OS-9 (Microware Systems Corporation) OS-9 is a real-time, multi-user, multitasking operating system developed by Microware Systems Corporation. It is modular, allowing new devices to be added to the system simply by writing new

A Multiple User Operating System

2102 words - 9 pages Introduction The operating system provides the graphical user interface simplifies the use of computers for users. Operating systems can be divided into few major types that are Single User OS, Multiple User OS, Real Time OS and Embedded OS. A Single User operating system provides access to the computer system for a single user at an instant. Single user operating system provides access to one user but support multitasking. A Multiple User OS

The JD Group Chooses Microsoft over Linux for Next-Generation Point-of-Sale

1673 words - 7 pages upgrade, the JD Group selected Microsoft Windows XP Embedded as the most cost-effective platform for its in-store systems. While Linux source code is available online, the investment required to transform it into an enterprise-ready, highly-secure operating system was ultimately prohibitive for the JD Group. Child says: "The cost of configuring and maintaining Linux to support our in-store applications would have been significantly higher than

Similar Essays

Evolution Of Computer Technology And Operating Systems

1971 words - 8 pages stable operating environment, more efficiency and less time lost. Window’s, Microsoft’s operating system, created a more comfortable user experience and had more quantity. Apple’s limitation to their own computer systems created less software problems, but limited the user’s access of their product. Windows distributed their operating system on a large scale, reaching out to HP, Dell, and many other famous computer companies. Then Windows began

Operating Systems Are The Very Basis Of Computer Software Programs

2266 words - 9 pages . An example would be MS- DOS. DOS however is a single user operating system which can only support input from one user at a time. So if more than one person needs to use a computer's resources or if people want to share files, a different operating system is needed. Hence network and multi user operating systems.Network operating systems such as Windows 2000 Server and Novell Netware allow several people to be connected to each others computer

Real Time Dynamic Integrated Outsourced Warehouse System

1392 words - 6 pages needs to be disposed. The end-user usually will ask the vendors for handling the disposed activities for EOL computers. The RL for EOL computers start from the end-user to vendors and the process of ac disposed by the vendors. The objective of the RL system can be to minimize the total cost that related and this study was practise in Taiwan (Shih, 2001). 2.2 Real Time Information Effect on Logistics Process In Chow et. al. (2007) paper, they had

An Operating System Is A Program That Acts An Intermediary Betweena User Of A Computer And The Computer Hardware

663 words - 3 pages tools for developing Internet web pages and operating system.UNIX, which is also a real operating system. More than one person can runmultiple applications, making it a multi-user and multitasking operatingsystem. With UNIX, each user logs in using a login name. Optionally,the user must also supply a password. The password ensures that theperson logging on with the user login name is really who she claimsto be. If the computer is attached to a