This page intentionally left blank Operating Systems in Depth This page intentionally left blank OPERATING SYSTEMS IN DEPTH Thomas W. Doeppner Brown University JOHN WILEY & SONS‚ INC. vice-president & executive publisher executive editor executive marketing manager production editor editorial program assistant senior marketing assistant executive media editor cover design cover photo Donald Fowley Beth Lang Golub Christopher Ruel Barbara Russiello Mike Berlin
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refers to the ability of an os to support multiple‚ concurrent paths of Execution within a single process. Kernel-level thread; this is a type of threading in which all of the work of thread management is done by the kernel. Thread; this is a single execution path‚ with an execution stack‚ processor stack‚ and scheduling information. Review Questions 4.1 Table 3.5 lists typical elements found in a process control block for an unthreaded OS. Of these‚ which should belong
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A History of Operating Systems To understand and to be prepared for the future of computer support it helps to know the history of operating systems. The operating system is the software that links the user to the computer’s hardware. Early mainframes (the predecessor of the personal computer) did not use an operating system. Programs were loaded onto the mainframe by paper punch cards‚ magnetic or paper tape. The user would start the program and wait for the program to complete‚ or crash
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has its separate set of register values and a separate stack. 4.4) Output at LINE C is 5. Output at LINE P is 0. 4.6) What are the two differences between user-level and kernel-level threads? Under what circumstances is one type is better than other? Answer: 1- User-level threads are unknown by the kernel‚ whereas the kernel is aware of kernel threads. 2- On systems using either M: 1 or M: N mapping‚ user threads are scheduled by the thread library and the kernel schedules kernel threads
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fork(); /* and fork another */ fork(); pid = getpid(); printf("Process : pid = %d \n"‚pid); return 0; } Output : Number of process = 8. 3.8 Describe the differences among short-term‚ medium-term‚ and longterm scheduling. Sol: Scheduler : A process moves among different scheduling queues throughout its lifetime. Operating system takes care of selecting the processes from these queues in some fashion. Selecting process is done by the the appropriate scheduler. Types of scheduling: Short
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Laboratory Manual Far Eastern University‚ Manila Windows 7 The Windows Operating System Release 1.0 (June 26‚ 2011) Prepared by Prof. Adonis C. Chico BSCS‚ MSCS (IT/CS Professor) Research References: Parsons‚ June Jamrich and Dan Oja‚ (2008)‚ Computer Concepts‚ Thomson. Gary B. Shelly‚ (2008)‚ Discovering Computers 2008: Complete‚ Thomson. Marthy Mathews‚ (2011)‚ Windows 7 Quick Steps for Seniors‚ McGraw-Hill Publishing. Jim Boyce‚(2009)‚Windows 7 Bible‚ Wiley Publishing‚ Inc. Website: http://www
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OPERATING SYSTEM FUNDAMENTALS This section explains the various operating systems available today and identifies major personal computer operating systems. Although Microsoft Windows is the dominant operating system in the personal computer market today‚ there are other operating systems that can run on various desktops and laptop. These operating systems vary in their popularity‚ system requirements and features. 3.1 Microsoft Windows Microsoft window is the single most popular and widely
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January 2015 1. What is the difference between a software application and an operating system? A computers operating system (OS) is the core of the computer and is more than just software. The OS controls the computer’s memory and processes as well as its hardware and software. It is the brain of the computer. Software applications on the other hand perform a certain task. Ex. Google Chrome provides internet and Adobe allows PDF files to be read (among other things). The OS is what makes all of these
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will encompass an operating system as well a workstations upgrade. Because this occurrence requires a comprehensive survey of all options of new Operating Systems as well as workstations‚ it is necessary to consider whether a Linux Based system is appropriate for our organizational needs at this point. Introduction The purpose of this paper is to investigate the pros and cons of using Linux in both a server and workstation environment. During this investigation several Linux distributions
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not require any special programming skills and can be done by users who only know DOS commands. An example of a well known batch file is the autoexec.bat‚ which is a simple batch file loaded each time the computer is loaded on MS-DOS and early Windows computers. This batch file contained all the necessary commands and programs used to run MS-DOS and Windows each time the computer booted. Use your VMware accounts to do this lab sheet because you will need to save your work. Next page please.
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