Michael Kifer And Scott Smolka Introduction To Operating Systems Design And Implementation 2007 Pdf


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Processes Class TaskCB i. It is intended to complement the use of an introductory textbook on operating systems and contains enough projects for up to three semesters. These projects expose students to many essential features of operating systems, while at the same time isolating them from low-level machine-dependent concerns. Thus, even in one semester, students can learn about page replacement strategies in virtual memory management, cpu scheduling strategies, disk seek time optimization, and other issues in operating system design.

Therefore as prerequisites for using OSP 2, students are expected to have solid Java programming skills; be well-versed in object-oriented programming concepts such as classes, objects, methods, and inheritance; to have taken an undergraduate Computer Science course in data structures; and to have working knowledge of a Java programming environment, i. OSP 2 consists of a number of modules, each of which performs a basic operating systems service, such as device scheduling, cpu scheduling, interrupt handling, file management, memory management, process management, resource management, and interprocess communication.

The OSP 2 distribution comes with a reference Java implementation of each module. By selectively omitting any one of these modules, the system can generate a project in which the students are to implement the missing parts. Projects can be organized in any desired order so as to progress in a manner consistent with the lecture material. Thus, among other things, OSP 2 teaches students to work with open environments where programming must be done to satisfy concrete sets of requirements and where a particular API must be used to interface to other subsystems.

The OSP 2 Project Generator generates a partial load module of standard OSP 2 modules to which the students link their implementation of the assigned modules. The result is a new and complete operating system, partially implemented by the student. These files are given as part of a project assignment in which the students are to fill in the procedure bodies.

This ensures a consistent interface. The heart of OSP 2 is a simulator that gives the illusion of a computer system with a dynamically evolving collection of user processes to be multiprogrammed.

All the other modules of OSP 2 are built to respond appropriately to the simulator-generated events that drive the operating system. The simulator understands its interaction with the other modules in that it can often detect an erroneous response by a module to a simulated event.

In such cases, the simulator will gracefully terminate execution of the program by delivering a meaningful error message to the user, indicating where the error might be found.

This facility serves both as a debugging tool for the student and as teaching tool for the instructor, as it ensures that student programs acceptable to the simulator are virtually bug-free. The difficulty of the job streams generated by the simulator can be dynamically adjusted by manipulating the simulation parameters. This yields a simple and effective way of testing the quality of student programs.

There are also facilities that allow the students to debug their programs. The main tools here are the detailed log of events and the various hooks into the system. Also, a graphical user interface GUI is available that provides a convenient way for students to enter simulation parameters and to view various statistics concerning the execution of OSP 2. The underlying model in OSP 2 is not a clone of any specific operating system. Rather it is an abstraction of the common features of several systems although a bias towards Unix and the Mach operating systems can be seen, at times.

Moreover, the OSP 2 modules were designed to hide a number of low-level concerns, yet still encompass the most salient aspects of their real-life counterparts in modern systems. Their implementation is well-suited as the project component of an introductory course in operating systems. Some parts of OSP 2 rely on third party software. For your OSP 2 programming assignments, your instructor will assign you one or more of these modules to implement, plug back into the rest of the system, and run via a simulation to ensure that your code is working correctly and efficiently.

This chapter describes in some detail this division of OSP 2 into modules and also provides you with other helpful information you will need to carry out your assignments. First, though, we shall step back and ask ourselves the questions: What is an operating system, and what kind of operating system is OSP 2? What is an Operating System?

In order to understand exactly what OSP 2 is and how it is organized, it is useful to first consider the basic question: What is an operating system? Two generally held views are that an OS is an extended machine, and an OS is a resource manager. According to the first view, the function of an operating system is to present the user with the equivalent of an extended machine or virtual machine that is easier to program than the underlying hardware [3].

This is accomplished through the operating system s system call interface: the collection of system calls that application programs may invoke to obtain one kind of service or another. For example, there are system calls to read and write files and to set the value of timers. Moreover, it is much easier to invoke these system calls to obtain system service as opposed to mucking around with hardware-specific instructions and machine registers, which one would be forced to do if there was no OS present.

OSP 2 has its own system call interface, and you will be introduced to the system calls Java methods that constitute this interface in the subsequent chapters of this book. According to the second view, an operating system is responsible for efficiently and fairly managing the resources of a computer system. These include processors CPUs ; memory physical and virtual ; devices such as disks; files and directories; and network connections ports.

By efficient, we mean that the OS should aim to maximize resource utilization whenever possible. By fair, we mean that users programs should be granted equitable allocation of resources during their execution. Note that most of the example resources we have listed are physical ones. One exception is files and directories. The part of the OS responsible for these logical resources is often called the file system.

As we will make clear later in this chapter, the view of an operating system as a resource manager is well suited to OSP 2, as OSP 2 s system call interface is organized in terms of the various resources OSP 2 is intended to manage.

More specifically, OSP 2 is organized into a number of modules Java packages to be precise and there is one such module for each type of resource OSP 2 is asked to manage. For example, there is an OSP 2 module for each of memory, devices, ports, etc. Collectively, these methods make up OSP 2 s system call interface. Different Flavors of Operating Systems.

To better understand OSP 2, it is also useful to realize that there are different flavors of operating systems available for the choosing.

Some of those that immediately come to mind, and which you have probably heard of, are Unix, Linux, Windows, and MacOS.

These systems differ mainly in the way they are structured and, of course, in their system call interfaces. Systems like Windows , Solaris a version of Unix from SUN Microsystems , and Mach an OS developed at Carnegie Mellon University in the s and which later influenced a number of commercial operating systems can be viewed as object-oriented: basic system resources are represented as objects and there exist well defined message-passing interfaces between objects.

On the other hand, OSP 2 is object-oriented after all, it is written in Java! Another way in which operating systems differ, and which in some sense distinguishes older operating systems from newer ones, is whether or not they support threads. In older. Multiprogramming is a technique aimed at increasing resource utilization. In this way, the CPU is kept busy doing useful work most of the time, just the kind of thing a resource manager should strive for. To conclude our brief look at multiprogramming, we should consider a little more carefully what it means to switch the CPU from one process to another, an operation commonly referred to as a context switch.

Several steps are involved. First, the currently executing process must be removed from the CPU and placed on a queue associated with the event on which it is waiting. This involves resetting a number of machine registers such as the program counter, general-purpose registers, memory-management registers, etc. The execution of this process can now resume. This is an admittedly simplified view of what s behind a context switch; the subject is treated more thoroughly in Chapter 3.

In newer systems like Mac, Solaris, and Windows , the schedulable and dispatchable units of execution are no longer processes but rather threads; a process simply serves as a container for one or more threads. Processes of this kind are usually referred to as tasks, and that shall be the convention adopted in this book. So what does it mean for a task to be a container for threads? It means that the constituent threads of a task share the resources allocated to the task, including memory, files, and communication ports.

As a result, switching the CPU from one thread to another is a lot simpler than switching the CPU from one process to another process as required in an OS that does not support threads. As we shall see, OSP 2 supports tasks and threads. Operating Systems are Event-Driven.

Operating systems are a perfect example of socalled event-driven systems. As the name applies, an event-driven system goes into action in response to the occurrence of some event that it is familiar with.

For example, a GUI graphical user interface program is an event-driven system that responds to clicks of the mouse made by the user; the precise piece of code that gets executed depends on what widget tool-bar item, button, radio dial, etc.

In the case of operating systems, the events that an OS responds to include system calls made by user or even system programs, hardware interrupts, and machine errors. Event-driven systems are typically structured as. When an event is caught, the case in the case-statement corresponding to that event is executed.

This kind of event-loop structure is indeed present in operating systems. Consider, for example, how a system call gets executed in a typical OS [3]. The calling program first pushes the parameters of the system call on the system stack. The system call number is placed in a register and a trap instruction is executed to switch from user mode to kernel mode.

The kernel examines the system call number and branches to the correct system call handler, usually via a table of pointers to system call handlers indexed on the system call number. At that point, the system call handler runs and, when finished, control may be returned to the calling procedure at the instruction following the trap instruction.

Hardware interrupts are handled in a similar event-driven way by an OS. In this case, a portion of system memory is set aside for the interrupt vector. Using the device number of the device that caused the interrupt, the interrupt vector may be indexed into to find the address of the interrupt handler for this device. OSP 2 is also event-driven, not surprising given that, after all, it is an operating system. However, OSP 2 responds to simulated events.

That is, at the core of OSP 2 is a simulator called the event engine see Figure 1. In response to such an event, the appropriate Java method is called. For example, suppose the event engine generates an event corresponding to an instance of the system call for opening a file.

Then the method open in class FileSys will be called. Moreover, if your instructor has assigned module FileSys to you as a project, then it is the code that you wrote for method open that will be executed in response to the event. This is actually a somewhat simplified view of how things work in OSP 2. Section 1. What this all means is that in OSP 2, there are no user programs per se that are being executed; all such programs are simulated by the event engine in the form of a stream of events that OSP 2 responds to.

CSCE 311 Operating Systems

Understanding the main principles and algorithms underlying a modern operating system is essential in undergraduate computer science. The complexity of this subject, however, means that mastering it requires significant practical experience. This unique book accomplishes just that: it teaches introductory subjects in OS design and implementation through hands-on engagement with OSP 2, the next generation of the highly popular OSP courseware. This book exposes students to many essential features of operating systems while at the same time isolating them from low-level, machine-dependent concerns. With its accompanying software, the book contains enough projects for up to three semesters. Even one semester's study, however, suffices to cover page-replacement strategies in virtual memory management, CPU scheduling strategies, disk seek-time optimization and other issues in operating system design. Written for undergraduates in a first operating systems course, this text provides essential foundations through the user-friendly, highly flexible OSP 2 courseware environment.

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Request PDF | Introduction to Operating System Design and Implementation: The OSP 2 Approach Introduction to Operating System Design and Implementation: The OSP 2 Approach Michael Kifer at Stony Brook University Scott A. Smolka Jan ; Undergraduate Topics in Computer Science.


Introduction to Operating System Design and Implementation: The Osp 2 Approach

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It seems that you're in Germany. We have a dedicated site for Germany. Authors: Kifer , Michael, Smolka , Scott.

Introduction to Operating System Design and Implementation: The OSP 2 Approach

Processes Class TaskCB i. It is intended to complement the use of an introductory textbook on operating systems and contains enough projects for up to three semesters. These projects expose students to many essential features of operating systems, while at the same time isolating them from low-level machine-dependent concerns. Thus, even in one semester, students can learn about page replacement strategies in virtual memory management, cpu scheduling strategies, disk seek time optimization, and other issues in operating system design.

Programming projects at kernel level under OSP software are also required. Prerequisite CS or permission of instructor. Textbook 1. Techniques in operating system design, implementation, and evaluation. Students can: Study topics in OS design in a theoretical way. Implement an operating system.

Чатрукьян знал и то, что выключить ТРАНСТЕКСТ можно двумя способами. Первый - с личного терминала коммандера, запертого в его кабинете, и он, конечно, исключался. Второй - с помощью ручного выключателя, расположенного в одном из ярусов под помещением шифровалки. Чатрукьян тяжело сглотнул. Он терпеть не мог эти ярусы. Он был там только один раз, когда проходил подготовку. Этот враждебный мир заполняли рабочие мостки, фреоновые трубки и пропасть глубиной 136 футов, на дне которой располагались генераторы питания ТРАНСТЕКСТА… Чатрукьяну страшно не хотелось погружаться в этот мир, да и вставать на пути Стратмора было далеко не безопасно, но долг есть долг.


Introduction to Operating System Design and Implementation: The OSP 2 Approach Topics in Computer Science) [Kifer, Michael, Smolka, Scott] on delawarecops.org 2 Approach (Undergraduate Topics in Computer Science) th Edition.


Introduction to Operating System Design and Implementation

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Мысли ее мешались: она тосковала по Дэвиду и страстно желала, чтобы Грег Хейл отправился домой. Но Хейл сидел на месте и помалкивал, поглощенный своим занятием. Ей было безразлично, чем именно он занят, лишь бы не заинтересовался включенным ТРАНСТЕКСТОМ. Пока этого, по-видимому, не случилось: цифра 16 в окне отсчета часов заставила бы его завопить от изумления. Сьюзан допивала уже третью чашку чая, когда это наконец произошло: компьютер пискнул. Пульс ее участился. На мониторе появилось символическое изображение конверта - это значило, что пришло сообщение по электронной почте.

Повсюду разбросаны грязные бумажные полотенца, лужи воды на полу. Старая электрическая сушилка для рук захватана грязными пальцами. Беккер остановился перед зеркалом и тяжело вздохнул. Обычно лучистые и ясные, сейчас его глаза казались усталыми, тусклыми. Сколько я уже тут кручусь. Однако считать ему не хотелось. По профессиональной привычке поправив съехавший набок узел галстука, он повернулся к писсуару.

 Он профессор, - поправила его Сьюзан и тут же пожалела об. У нее часто возникало чувство, что Стратмор не слишком высокого мнения о Дэвиде и считает, что она могла бы найти себе кого-то поинтереснее, чем простой преподаватель.  - Коммандер, - сказала она, - если вы инструктировали Дэвида сегодня утром по телефону из машины, кто-то мог перехватить… - Один шанс на миллион, - возразил Стратмор, стараясь ее успокоить.  - Подслушивающий должен был находиться в непосредственной близости и точно знать, что надо подслушивать.  - Он положил руку ей на плечо.

Я умер. Но я слышу какие-то звуки. Далекий голос… - Дэвид. Он почувствовал болезненное жжение в боку. Мое тело мне больше не принадлежит.

 Утечка прекратилась! - крикнул техник. - Вторжение прекращено. Наверху, на экране ВР, возникла первая из пяти защитных стен. Черные атакующие линии начали исчезать. - Происходит восстановление! - кричал Джабба.

Сьюзан открыла рот, желая сказать, что она все понимает, но ее слова были заглушены внезапным пронзительным звуком. Тишина шифровалки взорвалась сигналом тревоги, доносившимся из служебного помещения ТРАНСТЕКСТА. Сьюзан и Стратмор в недоумении посмотрели друг на друга. - Что это? - вскрикнула Сьюзан между сигналами.

Он спрятал свой ключ, зашифровав его формулой, содержащейся в этом ключе. - А что за файл в ТРАНСТЕКСТЕ? - спросила Сьюзан. - Я, как и все прочие, скачал его с сайта Танкадо в Интернете.

2 Comments

Brian H.
04.02.2021 at 20:52 - Reply

Introduction to Operating System Design and Implementation. The OSP 2 Pages I-XII. PDF · Organization of OSP 2. Michael Kifer, Scott A. Smolka. Pages 1​

Jannifer M.
06.02.2021 at 10:03 - Reply

The OSP 2 Approach. Authors: Kifer, Michael, Smolka, Scott. Free Preview. Contains up to three semesters worth of projects.

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