Operations on Files

This book is about learning to protect data with encryption. It’s a combination primer, story, guide, and handbook on how to use Gnu Privacy Guard (GnuPG) encryption software to protect data in motion (messages or files being sent over the Internet), followed by a brief discussion of how to protect data at rest by using full disk encryption (FDE) on modern operating systems (OSes).

114p runthenight08 12-04-2023 5 4   Download

Advanced Operating Systems - Lecture 27: Page replacement. This lecture will cover the following: page replacement; per-process page replacement; thrashing; working set model; page fault frequency (PFF); copy on write; sharing; hypothetical working set algorithm; memory mapped files;...

19p haoasakura 30-05-2022 11 3   Download

Advanced Operating Systems - Lecture 32: Reconstruct freelist on crash. This lecture will cover the following: reactive to reconstruct freelist on crash; deleting a file; bogus reference count; growing a file; conservatively moving a file; FSCK - reconstructing file system;...

11p haoasakura 30-05-2022 6 3   Download

Lecture Database Systems - Chapter 8: Data storage, Indexing structures for Files has present the content: overview of database design process; data storage: disk storage devices, files of records, operations on files, unordered files; indexing structures for files: types of single-level ordered indexes, multilevel indexes;...

57p andromedashun 26-05-2022 16 3   Download

Lecture Database Systems - Chapter 8: Data storage, indexing structures for files has present the contents data storage like disk storage devices, files of records, operations on files, unordered files, ordered files; indexing structures for files like types of single-level ordered indexes, multilevel indexes;...

52p andromedashun 26-05-2022 9 3   Download

The objectives of this chapter: To explain the naming mechanism that provides location transparency and independence; To describe the various methods for accessing distributed files; To contrast stateful and stateless distributed file servers; To show how replication of files on different machines in a distributed file system is a useful redundancy for improving availability; To introduce the Andrew file system (AFS) as an example of a distributed file system.

29p caphesuadathemot 20-12-2021 11 6   Download

Lecture Introduction to Computer Programming - Chapter 9: File Processing present the content introduction, declare files, open and close files, store and retrieve data from files, use macros,...

38p xusong 05-07-2021 19 1   Download

In this chapter, we introduce many concepts associated with multithreaded computer systems, including a discussion of the APIs for the Pthreads, Windows, and Java thread libraries. We look at a number of issues related to multithreaded programming and its effect on the design of operating systems. Finally, we explore how the Windows and Linux operating systems support threads at the kernel level.

24p koxih_kothogmih3 24-08-2020 18 4   Download

In this chapter, we discuss various ways to manage memory. The memory- management algorithms vary from a primitive bare-machine approach to paging and segmentation strategies. Each approach has its own advantages and disadvantages. Selection of a memory-management method for a specific system depends on many factors, especially on the hardware design of the system. As we shall see, many algorithms require hardware support, leading many systems to have closely integrated hardware and operating-system memory management.

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In previous chapter, we introduced threads to the process model. On operating systems that support them, it is kernel-level threads not processes that are in fact being scheduled by the operating system. However, the terms "process scheduling" and "thread scheduling" are often used interchangeably. In this chapter, we use process scheduling when discussing general scheduling concepts and thread scheduling to refer to thread-specific ideas.

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The various processes in an operating system must be protected from one another’s activities. For that purpose, various mechanisms exist that can be used to ensure that the files, memory segments, CPU, and other resources can be operated on by only those processes that have gained proper authorization from the operating system. In this chapter, we examine the problem of protection in great detail and develop a unifying model for implementing protection.

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In this chapter, we examine one of the most important and widely used categories of operating systems: embedded operating systems. The embedded system environment places unique and demanding requirements on the OS and calls for design strategies quite different than that found in ordinary operating systems.

58p koxih_kothogmih3 24-08-2020 26 4   Download

This chapter is primarily concerned with issues surrounding file storage and access on the most common secondary-storage medium, the disk. We explore ways to structure file use, to allocate disk space, to recover freed space, to track the locations of data, and to interface other parts of the operating system to secondary storage. Performance issues are considered throughout the chapter.

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After studying this chapter, you should be able to: Summarize key categories of I/O devices on computers, discuss the organization of the I/O function, explain some of the key issues in the design of OS support for I/O, analyze the performance implications of various I/O buffering alternatives,...

26p koxih_kothogmih3 24-08-2020 9 2   Download

Even a home computer user can be part of a truly global network. A connection to the Internet makes your home computer one of the millions of nodes on the vast Internet network. You can share files, collaborate, communicate, and conference with people on the other side of the globe. This lesson examines some of the most common ways of transmitting data via networks and the Internet.

78p koxih_kothogmih3 24-08-2020 21 3   Download

Module 11 - File-system implementation. In this chapter we discuss various methods for storing information on secondary storage. The basic issues are device directory, free space management, and space allocation on a disk.

20p thuongdanguyetan03 18-04-2020 22 2   Download

The various processes in an operating system must be protected from one another’s activities. For that purpose, various mechanisms exist that can be used to ensure that the files, memory segments, CPU, and other resources can be operated on by only those processes that have gained proper authorization from the operating system. In this chapter, we examine the problem of protection in great detail and develop a unifying model for implementing protection.

16p thuongdanguyetan03 18-04-2020 23 2   Download

This study investigates the relationship between R&D investment, patent filings and financial success for firms. Firms which have high degrees of R&D investment and large numbers of patents are referred to as “high innovation energy corporations”. This study investigates the financial performance of such firms among a sample of Taiwanese hightech companies from 2000 to 2011.

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Nowadays, e-Learning has been used in many kinds of educational institutes as a regular learning/teaching system. In the real practices, Educational knowledge management among the relevant organizations is quite important. This means “knowledge in universities circulated-systematic process” of finding, selecting, organising, distilling and presenting information in a way that improves a learner‟s competency and/or ability to fulfil his or her necessary learning objectives.

12p quenchua1 06-11-2019 25 1   Download

Chapter 6 - Virtual memory. This chapter deals with virtual memory implementation using paging in detail. It discusses how the kernel keeps the code and data of a process on a disk and loads parts of it into memory when required, and how the performance of a process is determined by the rate at which parts of a process have to be loaded from the disk.

67p shiwo_ding5 14-05-2019 17 3   Download