Operating System An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. It is a program designed to run other programs on a computer. The operating system is an essential component of the system software in a computer system. Application programs usually require an operating system to function. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software
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Definition of Operating System: An Operating system is a program that controls the execution of application programs and acts as an interface between the user of a computer and the computer hardware. Need of an operating system: When a program written in a high level language is executed by a computer‚ the following steps are followed… The compiler to translate the program is loaded in the memory. The source program is read and loaded in the memory. The source program is compiled into object program
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Dual-mode Operation allows OS to protect itself and other system components whereas Multimode Operation increasingly CPUs support multi-mode operations. System call provides the means for a user program to ask OS to perform OS tasks on the user program’s behalf. When a system callis executed‚ it is treated by H/W as a S/W interrupt. Timer protects CPU resource from getting stuck by a user program. To ensure OS maintains control over the CPU‚ a timer can be set to interrupt the computer after a specified
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Health Care Delivery LaKesha Lewis HCA 305 Rebecca Gillaspy August 29‚ 2011 Outline I. What is society’s obligation to ensure access to a basic level of health care for all its citizens and how can it be accomplished? a. Provide adequate levels of healthcare. b. Create local‚ nonprofit managed care plans for low income workers‚ uninsured residents‚ or people living with chronic diseases. II. Should government take a more aggressive role in reshaping the health
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1. Briefly‚ what is an operating system? An operating system serves as a hardware/software interface‚ acts as a repository for common‚ shared routines and defines a platform for constructing and executing application software. 2. An operating system presents an application programmer with a relatively "friendly" hardware/software interface. What does this mean? Why is it important? The user interface‚ sometimes called the shell‚ provides a mechanism for the user and application programs to communicate
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Operating Systems Assignment 1 Session: Summer 2013 Faculty of Information Technology UCP Lahore Pakistan Operating Systems Assignment: Introduction and Overview of Operating Systems 150 MARKS Write in your own words to answer the following‚ if you use material from any book website apart from your recommended book please provide so. All work will be assumed yours otherwise. Justify your answers where needed. Explain briefly and concisely 1. You are to procure Linux
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the I/O of a job with that job’s own computation. After a read operation completes and the job is about to start operating on the data‚ the input device is instructed to begin the next read immediately. The CPU and input device are then both busy. With luck‚ by the time that the job is ready for the next data item‚ the input device will have finished reading that data item. The CPU can then begin processing the newly read data‚ while the input device starts to read the following data. While Spooling
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Operating Systems Assignment #5 Of Chapter 4 Eighth Edition of Operating System Concepts by Avi Silberschatz Peter Baer Galvin & Greg Gagne 2009 4.1 Provide two programming examples in which multithreading does not provide better performance than a single-threaded solution Answer: (1) Any kind of sequential program is not a good candidate to be threaded. An example of this is a program that calculates an individual tax return. (2) Another example is a "shell" program such as
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Disease Trends and the Delivery of Health Care Services Final Project Axia college 1/15/2012 Many health care professional have great concerns about the growth of the aging population‚ chronic disease and the epidemic of obesity‚ and how will the United States healthcare system prepared for this continuing epidemic. The fact that the aging population along with obesity epidemic is a global healthcare concern‚ many health cares’ professional is baffled about how to address the growing epidemic
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CS 3530 Operating Systems L02 OS Intro Part 1 Dr. Ken Hoganson Chapter 1 Basic Concepts of Operating Systems Computer Systems A computer system consists of two basic types of components: • Hardware components‚ which are the electronic devices and electromechanical devices‚ such as the processors‚ memory modules‚ disk units‚ keyboard‚ screen‚ and other devices. • Software components‚ such as the application programs‚ operating system‚ utilities‚ and other programs. 3 Computer Architecture
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