real time operating systems question papers

... Real-time Systems Week 2: Real-time Operating System (RTOS) Ngo Lam Trung Dept of Computer Engineering NLT, SoICT, 2014 Content  Real-time operating system (RTOS)  ...  Better reliability Scalability Faster performance (in real-time contexts) Reduced memory requirements Support for diskless embedded systems Better portability to different hardware platforms ... Deterministic operation: RTOSes with predictable behavior, in which the completion of operating system calls occurs within known timeframes NLT, SoICT, 2014 Performance  Fast enough to fulfill timing requirements

Ngày tải lên: 30/01/2020, 00:56

... [9], which is open-source real-time in-strumentation middleware for distributed real-time and embedded (DRE) systems.OASIS enables real-time instrumentation of DRE systems without a priori knowledge ... the Graduate Program Date Darshan Gajanan Puranik Real-time Monitoring of Distributed Real-time Embedded Systems using Web Trang 2EMBEDDED SYSTEMS USING WEBA ThesisSubmitted to the Faculty ofPurdue ... experience report for adding real-time monitoring support over the Web to the Open-source Architecture of Software Instrumentation of Systems (OASIS),which is open-source real-time instrumentation middleware

Ngày tải lên: 24/08/2014, 12:08

... scheduling strategies for real-time systems are reviewed Although it is a traditional topic, the scheduling algorithm design evolves with the nology advancements of real-time systems The following ... for Multiprocessor Real-Time Embedded Systems,” prepar-ing for journal submission Dy-3 Heng Yu, Bharadwaj Veeravalli, and Yajun Ha, “Leakage-aware DynamicScheduling for Real-time Adaptive Applications ... processing time, and a back-upversion producing acceptable results in a timely manner As a fault tolerance strat-egy, a primary-backup framework is proposed to provide fast but weakly-consistentreal-time

Ngày tải lên: 10/09/2015, 15:52

... applications, real- time systems are categorized into soft real- time systems and hard real- time systems according to their performance of response time A hard real- time system ... many studies on real- time systems and real- time operating systems Martin [1] describes the concept of Real- time System (RTS) A System is considered to be real- time system ... Besides, a real-time control subsystem is built into the operating system to deploy real-time tasks and scale to real-time applications. In this hybrid operating system, the real-time tasks share

Ngày tải lên: 11/09/2015, 16:07

... real-time computer-controlled systems are designed in two separatesteps: controller design and real-time scheduling (Seto et al., 2001) Controllerdesign is primarily based on the continuous-time ... attributesinclude the task release time, the task period, the task execution time, the responsetime and the task deadline • The release time is the moment of time when the task becomes eligible ... deadline, and the task execution time Trang 27Chapter 3Related Works Real-time scheduling has evolved from static to dynamic and adaptive Early search works on real-time scheduling aimed to completely

Ngày tải lên: 04/10/2015, 17:06

... creation of these advanced designs A Real-Time Operating System (RTOS) offers an application developer a number of aids that allow a complex design to be completed in a timely fashion, permit easy integration ... will use the termsinterchangeably within this document Integrating Microchip Libraries with a Real-Time Operating System Trang 2EXAMPLE 1: MAIN LOOP FROM TCP/IP STACK The sample code in Example 1 ... allocates Timer1 as the default RTOS timer This is set to periodically inter-rupt the processor and allow the RTOS to perform a pre-emptive context switch to another task if required Timer1 is

Ngày tải lên: 11/01/2016, 17:04

... Trang 3Model-Driven Engineering for Distributed Real-Time Systems MARTE Modeling, Model Transformations and their Usages Edited by Jean-Philippe Babau ... Library of Congress Cataloging-in-Publication Data Model-driven engineering for distributed real-time systems : MARTE modeling, model transformations, and their usages / edited by Jean-Philippe ... Implementation issues 101 4.6 Bibliography 101 Chapter 5 Using MARTE and SysML for Modeling Real-Time Embedded Systems 105 Huascar ESPINOZA, Daniela CANCILA, Sébastien GÉRARD and Bran SELIC 5.1

Ngày tải lên: 12/03/2019, 13:21

... background, and comes into play: • At every RTOS TIMER interrupt (usually Timer 2 or Timer 0, every one millisecond). • At any other interrupt from other timers or external inputs. • Whenever an RTOS ... 12.5 DPTR DPTR is really a combination of two 8-bit registers DPH and DPL, taken together as a 16-bit value In reality, we almost always have to deal with DPTR one byte at a time For example, ... would be able to take the necessary precautions. Forgetting to re-start a timer: We might turn off a timer to re-load the timer register values or to read the counter in an interrupt service routine

Ngày tải lên: 13/01/2021, 03:14

... COUNTY, TEXASRFP-27-05-049-SVC DUE: June 1, 2007 @ 2:00 PM Information Services For Real Time Location Systems Trang 2RFID EvaluationTable of Contents Introduction 3 1 Scope of Work 3 1.1 Current ... PlanIntroduction 1 Scope of Work The University Health System (The System) is developing its Real Time Location Systems (RTLS) for the purpose of tracking assets, managing inventory, increasing productivity, ... project timeline - Develop scenarios and criteria for testing and compliance of 2 -3 systems based on input derived from the system requirements - Will conduct testing and evaluating of systems

Ngày tải lên: 20/10/2022, 04:23

... Unix-like real-time operating system RTOS Real-time operating system TTC time triggered cooperative ZOH zero-order-hold Trang 131 Abstract Designing a real-time embedded control system requires ... input-output OS Operating system PDF probability density function PI proportional-integral PID proportional–integral–derivative PWM pulse width modulation QNX a commercial Unix-like real-time operating ... clock (with jitter)[32] 16 Fig 2-7 Typical design cycle of a real-time control system[34] 17 Fig 2-8 Design process for integrated real-time control system[35] 18 Fig 2-9 PRESTO design methodology[40]

Ngày tải lên: 29/10/2022, 01:39

... assessed them Keywords: Embedded real-time systems, component model, non-functional properties, separation of concerns 1 Introduction Non-functional concerns such as time and space predictability, ... The Ptolemy project [28] studies modeling, simulation, and design of concurrent, real-time, embedded systems realized as an assembly of concurrent components The key principle underneath the ... components All other concerns (concurrency and real-time, dependability, deployment) are addressed in separate development steps Figure 3 depicts concurrency, real-time and deployment, which are directly

Ngày tải lên: 01/11/2022, 08:29

... The FP-Based Job SetSo far, we are assuming that the real-time jobs are scheduled by the EDF scheme In what follows, we study the real-time systems scheduled based on FP scheme, such as rate monotonic ... the đ; can be either the completion time of J,, according to the DVS schedule, or the ar- rival time of J;, or even smaller Note that using the completion time of J, according to the DVS schedule ... than a specified target time (Tg) This is because the LST effectively determines the scheduling constraints for the entire job set By identifying the latest possible start times for jobs based on

Ngày tải lên: 02/10/2024, 01:36

... re-quires integrating a range of real-time capabilities, such as QoS-enabled network protocols, real-time operating system scheduling mechanisms and policies, and real-time middle-ware services, across ... service (QoS) in distributed real-time embedded (DRE) systems require QoS support and en-forcement from their underlying operating platforms that integrates many real-time capabilities, such as ... QoS-enabled middleware technologies, such as real-time CORBA [3] and the real-time Java [4], have been used extensively as an operating platforms to build DRE systems as they support explicit configuration

Ngày tải lên: 22/06/2014, 00:20

... Microcontrollers Not all real-time systems are based on a microprocessor. Some may involve a mainframe or minicomputers, while others are based on a microcontroller. Very large real-time systems involving ... have a major advantage in real-time systems in that, in theory, the average instruction execution time is shorter than for CISCs. The reduced instruc- tion execution time leads to shorter interrupt ... including image processing, avionics systems, and medical systems, and the real-time design issues are the same for them as they are for most other systems 2. 7 a OTHER SPECIAL... hundreds

Ngày tải lên: 13/08/2014, 08:20

... tests before enabling any interrupts.Finally, real-time processing can begin Trang 43.1 REAL-TIME KERNELS 853.1.4.4 Real-Time Operation The real-time or foreground operation for theforeground/background ... ready list 3.2 THEORETICAL FOUNDATIONS OF REAL-TIME OPERATING SYSTEMS In order to take advantage of some of the more theoretical results in real-timeoperating systems (RTOS), a fairly rigorous formulation ... implementingcommercial, full-featured, real-time operating systems because the number ofreal-time tasks can vary This architecture is used in interactive on-line systemswhere tasks (associated with

Ngày tải lên: 13/08/2014, 08:20

... it_interval; }; int timer_settime (timer_t timerid, int flag, struct itimerspec *value, struct itimerspec *oldvalue); This function sets the next expiration time for the timer specified If flag is ... useful in real-time systems In addition to paging (and associatedthrashing problems), the key disadvantage of page swapping in real-time systems phys-is the lack of predictable execution time It ... System lifetimevisi-ble to all processes running on the system TheCLOCK_REALTIMEclock measuresthe amount of time that has elapsed since 00:00:00 January 1, 1970 As mentioned,CLOCK_REALTIMEis commonly

Ngày tải lên: 13/08/2014, 08:20

... complex real-time system 1 INTRODUCTION Traffic controllers currently in use comprise simple timers that follow a fixed cycle to allow vehicle/pedestrian passage for a pre-determined amount of time ... priority of the approaches. Cycle Time Time to complete a full traversal of all intersection phases. Splits Array of numbers defining the fraction of the cycle time allocated to each phase. Current ... vehicle/pedestrian detection, and adaptive traffic controllers that determine traf-fic conditions in real-time by means of vehicle/pedestrian detection and respond accordingly in order to maintain the

Ngày tải lên: 13/08/2014, 08:20

... image-in the way of stimuli and response Real-time systems are usually data intensive and would seem well suited tostructured analysis But real-time systems also include control information, ... patterns in detail Other patterns have evolved,particularly for real-time systems, that provide various approaches to addressingthe real-time communication and synchronization problem (e.g., [Douglass03;Schmidt00]) ... object-oriented design has been done with little or noprovision for real-time requirements Two methodologies that do make such pro-visions, real-time object-oriented modeling (ROOM) [Selic94] and HRT-HOOD[Burns90]

Ngày tải lên: 13/08/2014, 08:20

... queue. Operating systems that handle different types of tasks may have more than one ready queue. G.C. Buttazzo, , Real- Time Systems Series 24, DOI 10.1007/978- - -0 - _ , Hard Real- Time Computing ... τ i ; r i,j denotes the release time of the jth instance of task τ i ; G.C. Buttazzo, , Real- Time Systems Series 24, DOI 10.1007/978- - -0 - _ , Hard Real- Time Computing Systems: Predictable Scheduling ... LLC 2011â 2 Chapter 1 military systems, space missions, consumer electronic devices, multimedia systems, smart toys, and virtual reality. In many cases, the real- time computer running the application...

Ngày tải lên: 01/04/2014, 17:20