OPERATING SYSTEMS UNIT 1 Learning Objective Understand the purpose of the operating system Distinguish between a resource‚ a program‚ and a process Recognize critical resources and explain the behavior of semaphores Describe various memory page replacement algorithms Describe how files are stored in secondary storage © Bharati Vidyapeeth’s Institute of Computer Applications and Management‚‚ New Delhi-63‚ by Parul Arora. U1. 4 Introduction • • • • • • • • •
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Windows NT vs Unix As An Operating System In the late 1960s a combined project between researchers at MIT‚ Bell Labs and General Electric led to the design of a third generation of computer operating system known as MULTICS (MULTiplexed Information and Computing Service). It was envisaged as a computer utility‚ a machine that would support hundreds of simultaneous timesharing users. They envisaged one huge machine providing computing power for everyone in Boston. The idea that machines as powerful
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Computer Operating Systems * Scheduling (broadcasting)‚ the minute planning of the content of a radio or television broadcast channel * Scheduling algorithm * Scheduling (computing)‚ the way various processes are assigned in multitasking and multiprocessing operating system design * Scheduling (production processes)‚ the planning of the production or the operation * Schedule (workplace)‚ ensuring that an organization has sufficient staffing levels at all times * Job scheduler‚ an enterprise software
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times. See the multi-user definition for a complete definition for a complete definition. Below are some examples of multi-user operating systems. Linux Unix Windows 2000 Multiprocessing - An operating system capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing operating systems. Linux Unix Windows 2000 Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time. Below are some
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What is o.s? An operating System (OS) is an intermediary between users and computer hardware. It provides users an environment in which a user can execute programs conveniently and efficiently. In technical terms‚ it is software which manages hardware. An operating System controls the allocation of resources and services such as memory‚ processors‚ devices and information . Definition An operating system is a program that acts as an interface between the user and the computer hardware
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System Programming Loaders and Linkers Introduction: In this chapter we will understand the concept of linking and loading. As discussed earlier the source program is converted to object program by assembler. The loader is a program which takes this object program‚ prepares it for execution‚ and loads this executable code of the source into memory for execution. Definition of Loader: Loader is utility program which takes object code as input prepares it for execution and loads the executable code
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It arranges files in a directory then places those files in another directory and repeats this process until it reaches the root directory 3. What is the difference between a multiprocessor and a multiprocessing system? Multiprocessor is when a computer has more than one processor to do the work‚ Multiprocessing is when one processor does multiple jobs at once. 4. Where on the disk should you put your /boot partition or the root (/) partitionif you do not use a /boot partition? Depending on the age of the system
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HUMAN RESOURCE MANAGEMENT SYSTEM Synopsis [pic] Date of Submission : 18.5.2010 Submitted by: Group No:
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Claims 1. A multiprocessing microprocessor based fuel injection system for an internal combustion engine comprising: power supply receiving means adapted to receive power upon demand of the engine operator and to receive standby voltage during engine non-operating times; a plurality of sensors adapted to be mounted on the engine‚ each of said sensors providing an output
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from accessing the computer system. There are multiuser‚ multiprocessing‚ multitasking‚ multithreading‚ and real-time operating systems. A multiuser operating system enables multiple users to run programs simultaneously. This type of operating system may be used for just a few people or hundreds of them. In fact‚ there are some operating systems that are used to allow thousands of people to run programs at the same time. A multiprocessing operating system allows a program to run on more than one
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