Laplante, Phillip A. Real-time systems design and analysis: an engineer's handbook / Phillip A. Laplante.–3rd ed. p. cm. Includes bibliographical references and. REAL-TIME SYSTEMS. DESIGN AND ANALYSIS. Tools for the Practitioner. Fourth Edition. PHILLIP A. LAPLANTE. SEPPO J. OVASKA. IEEE PRESS. A JOHN. Real Time System 12 Philip A Laplante 2nd Edition - Free download as PDF File .pdf), Text File .txt) or read online for free. For more notes on engg and CA visit.
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Real-Time Systems Design and Analysis (eBook, PDF). Tools for the Practitioner. Leseprobe · Real-Time Systems Design and Analysis (eBook, PDF) - Laplante. The leading guide to real-time systems design-revised and updated. This third edition of Phillip Laplante's bestselling, practical guide to. View Table of Contents for RealTime Systems Design and Analysis. Real‐Time Systems Design and Analysis: Tools for the Practitioner, Phillip A. Laplante · Seppo J. Ovaska PDF · Request permissions · xml.
In den Warenkorb. Sie sind bereits eingeloggt. Klicken Sie auf 2. Alle Produkte. Laplante spent several years as a software engineer and project manager working on avionics, computer-aided design, and software test systems.
He has authored or edited twenty-seven books and has published more than scholarly articles. He has served as a visiting scholar at Utah State University, Virginia Tech, and the University of Passau, Germany, and has published more than articles in peer-reviewed journals. Prior to his academic career, Dr. Ovaska developed control systems for high-rise elevators; those contributions led to nine international patents.
Also, simultaneoususe of a critical resource. The processof compressingfragmentedmemory so that it is no lon-eer fragmented. Also called coalescing. Complex instruction set computers.
Architecturescharacterizedbv a larse. An operationappliedto a reliability matrix that determinesthe marin-iuir reliability betweenprocessors. Condition code register. Intemal CPU register used to implemenr a.
Conditional transfer. A changeof the program counterbasedon the resuk. See associatrvememory. The minimum informationthat is neededin order to sa'e a curienrlr. Context switching. The processof saving and restorine suft-rcientinformation for a real-time task so that it can be resumedafter beins intem-rpred. The processof forcing all allocatedfile sectorsto follow one anotheron the disk. A random variablewith a continuoussamplespace.
Control flow diagram.
A real-timeextensionto dataflowdiagramsthat showsthe flow of control signalsthrough the system. Control specifications. In dataflow diagrams,a finite state automatonin diagrammatic and tabularrepresentation. Control unit. CPU internal device that synchronizesthe fetch-executecycle. Cooperative multitasking system. A scheme in which two or more processesare divided into statesor phases,determinedby a finite stateautomaton.
Calls to a central dispatcher are made after each phase is complete.
A secondspecializedCPU used to extendthe macroinstructionset. Coroutine system. See cooperativemultitaskingsystem. Counting semaphore. A semaphorethat can take on two or more values. Critical region.
Code that interactswith a serially reusableresource. See control unit.
Cycle stealing. Cyclic redundancy code. A method for checking ROM memory that is superior to checksum.
See Chapter The processwhereby all tasks are being appropriately scheduled although no actualprocessingis occurring.
A measureof a system reliability devised by McCabe. D Daemon. A device serverthat doesnot run explicitly but rather lies dormant waiting for some condition s to occur.
Dangerous allocation. Any memory allocation that can preplude system determi- nrsm. Data bus. Bus used to carry data between the various componentsin the system. Dataflow architectures. A multiprocessing system that uses a large number of speciai processors,and computation is performed by passing activiti packs between them.
A structured analysis tool for modeling software systems. Dead code. See unreachablecode. A catastrophicsituation that can arise when tasksare cornpetingfor the sarne set of two or more serially reusableresources. Deadly embrace. See deadlock. Death spiral. Stack overflow causedby repeatedspurious interrupts. The processof isolating the opcodeTieldof a macroinstructionand determin-:ne the addressin micromemory of the programming correspondingto it' I Glossary 33r Defect.
The preferred term for an error in requirement,design, or code.
See also fault, failure. Demand page system. Techniquewhere program segmentsare permittedto be loaded in noncontiguousmemory as they are requestedin fixed-sizechunks. Also, the easel macroinstruc— tiori would probably increase the worm case interrupt latency owing to its complexity. By partitioning things likely to change only that module need he touched when a change is required, without the need to modify unaffected code. This technique is particularly, appiicable and useful in real-time systems, owing to the nature of these systems.
Since they are so directly tied to hardware. The White Paper is reviewed to judge the feasibility of the needs and goals and to assess whether they are obtainable and testable. As the Requirements Spec is generated, so are Test Requirements, resulting in a Test Plan that is used as a guide in developing detailed test cases later in the cycle. During this phase, detailed test cases, based on Test Plan guidelines, are developed to test the design partitions or modules and the'interfaces integration.
In this phase, the actual module testing of code is performed using the test cases developed above. At this point, the protested modules are gathered into a system, and the system is tested to the system or integration test cases developed above.
Success results in validated software. The system must then be re-subjected to module andsystem tests to ensure that the change was implemented correctly and had no impact on unchanged areas.
I Chapter 5 15 9. Use of a mock-up or prototype achieves two goals: This can catch potential problems or identify areas that need improvement early on in'the life cycle, when changes are made more easily and are less costiy.
It also increases communication between the users and the developers throughout the design process. Priorities ShOuid be assigned to aircraft depending on their position. Poiled loop code of Example 6. Synchronized polied ioop code in C: State—driven code in C: Interrupt driven processes should be allowed to interrupt themselves in most cases. Although this may seem odd, there are practical reasons for it. By allowing a process to interrupt itself and by checking for this eventuality by checking and setting a globai flag at the start of the interrupt service routine , transient overloads.
The size of the stack should be the amount of space needed to save the state of one cycle, times the total number of cycles plus one. In this case, the background requires milliseconds to complete. If the background process has been operating for more than 25 milliseconds before being interrupted, then it will need oniy milliseconds to complete. If it is implemented in a direct access manner, then the size has no effect on the performance.
On the other hand. A large N'can seriously degrade real-time performance. If interrupts are disabled before the while statement in wait operation and the semaphore is iocked , then there will be no opportunity for another task to interrupt and release the semaphore. Hence, the process that is waiting will be hung up, and no other process can runw—a deadlock. I Chapter 8 - I 23 waittmutexi; extracttmailhox,messege i update; eignaltmutex ; end and Now, 7f.