Introduction to Operating Systems
An operating system is a program that acts as an intermediary between a user of a computer and the
computer hardware. The purpose of an operating system is to provide an environment in which a user can execute programs.The primary goal of an operating system is thus to make the computer system convenient to use.
A secondary goal is to use the computer hardware in an efficient manner.In brief, an operating system is the set of programs that controls a computer. Some examples of operating systems are UNIX, Mach, MS-DOS, MS-Windows,
Windows/NT, OS/2 and MacOS. An operating system is an important part of almost every computer system.
• A computer system can be divided roughly into four components: the hardware, the operating system,
the application programs and the users.in the next slides we will demonstrates the detailed features of the OS.We look at inside of an O/S briefly to understand its Mode of operation. Interrupt-Based Systems: Interrupt is a mechanism to draw system s attention to perform some specific task. Sometime it becomes necessary to divert the CPU from what it is doing to some other task. For example, if a batch job is utilizing the CPU and an important interactive job completes the data transfer from disk then the CPU must resume its execution. This type of CPU migration which is forced upon the CPU is achieved through interrupt. An interrupt mechanism gives the CPU a complete freedom to continue whatever it initiates. This improves resources utilization by decreasing CPU idle time
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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