OPERATING SYSTEM CONCEPTS 8TH EDITION PDF CHAPTER 4

Both M:M and Two-level models require communication to maintain the appropriate number of kernel threads allocated to the applicationScheduler activations provide upcalls - a communication mechanism from the kernel to the thread libraryThis communication allows an application to maintain the corre[r]

Core of NetWare 6.5 OS–Oversees all critical server processes–Started by server.exe, which runs from server’s DOS partition•Takes advantage of SMP–Up to 32 processors•NetWare loadable modules (NLMs): Enable server to run variety of programs and services–Each consumes some of server’s memory and proc[r]

 Trojan Horsez Code segment that misuses its environmentz Exploits mechanisms for allowing programs written by users to beexecuted by other usersz Spyware, pop-up browser windows, covert channels Trap Doorz Specific user identifier or password that circumvents normal security proceduresz Could be[r]

Operating System Concepts – 7thEdition, Apr 11, 2005Use of Access MatrixUse of Access Matrix If a process in Domain Ditries to do “op” on object Oj, then “op”must be in the access matrix. Can be expanded to dynamic protection.z Operations to add, delete access rights.z Special[r]

to use cross-process memory functions such as ReadProcessMemory and WriteProcessMemory. In addition to a private address space and one or more threads, each process has a security identification and a list of open handles to objects such as files, shared memory sections, or one of the synchronizatio[r]

Chapter 13: I/O SystemsChapter 13: I/O Systems13.2Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Jan 2, 2005Chapter 13: I/O SystemsChapter 13: I/O Systems I/O Hardware Application I/O Interface Kernel I/O Subsystem Transforming I/O[r]

access. User programs could neither ensure adherence to protection methods nor betrusted to allocate only free blocks and deallocate blocks on file deletion.Communications. Message passing between systems requires messages be turnedinto packets of information, sent to the network controller, transmit[r]

The Linux Kernel Version 0.01 (May 1991) had no networking, ran only on 80386-compatible Intel processors and on PC hardware, had extremely limited device-drive support, and supported only the Minix file system Linux 1.0 (March 1994) included these new features:z Support for UNIX’s standard[r]

into drive or storage array12.5Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Jan 1, 2005MovingMoving--head Disk head Disk MachanismMachanism12.6Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Jan 1, 2[r]

another resource that cannot be immediately allocated to it, then all resources currently being held are released.z Preempted resources are added to the list of resources for which the process is waiting.z Process will be restarted only when it can regain its old resources, as well as the new ones t[r]

 To discuss the defining characteristics of real-time systems To describe scheduling algorithms for hard real-time systems19.4Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Jan 1, 2005Overview of RealOverview of Real--Time SystemsTime Systems A re[r]

 Advantages of main-memory caches:z Permit workstations to be disklessz Data can be accessed more quicklyz Performance speedup in bigger memoriesz Server caches (used to speed up disk I/O) are in main memory regardless of where user caches are located; using main-memory caches on the user machine p[r]

thEdition, Feb 22, 2005Dynamic relocation using a relocation registerDynamic relocation using a relocation register8.11Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Feb 22, 2005Dynamic LoadingDynamic Loading Routine is not loaded until it is called[r]

to clients and across server farms.The Windows Server 2003 family and applications built with the .NET Framework are scalable by design. Not only does the Windows Server 2003 family offer rich servers, from a basic Web Edition through an advanced Datacenter Edition, the same industry-s[r]

III.1.1.NGĂN CHẶN DEADLOCKĐiều kiện này có thể ngăn chặn bằng cách phân lớp tài nguyên của hệ thống. Theo đó, nếu một tiến trình được cấp phát tài nguyên ở lớp L, thì sau đó nó chỉ có thể yêu cầu các tài nguyên ở lớp thấp hơn lớp L. III.1.2.TRÁNH DEADLOCK1.Trạng thái an toàn:Trạng thái an toàn thỏa[r]

1INTRODUCTION1.1 WHAT IS AN OPERATING SYSTEM?1.2 HISTORY OF OPERATING SYSTEMS1.3 THE OPERATING SYSTEM ZOO1.4 COMPUTER HARDWARE REVIEW1.5 OPERATING SYSTEM CONCEPTS1.6 SYSTEM CALLS1.7 OPERATING SYSTEM STRUCTURE1.8 RESEARCH ON[r]

jα tn -j+ …+(1 - α )n +1 τ0 Since both α and (1 - α) are less than or equal to 1, each successive term has less weight than its predecessor5.18Silberschatz, Galvin and Gagne ©2005Operating System Concepts – 7thEdition, Feb 2, 2005Priority SchedulingPriority Scheduling A priori[r]

switched timedelay systems stability and control pdfstability and control of time delay systems pdfpower system analysis and design 5th edition pdf free downloadpower system analysis and design 5th edition pdf downloadpower system analysis and design glover 5th edition pdf free downloadpower system[r]

and 1; can be simpler to implementz Also known as mutex locks Can implement a counting semaphore S as a binary semaphore Provides mutual exclusionz Semaphore S; // initialized to 1z wait (S);Critical Sectionsignal (S);6.17Silberschatz, Galvin and Gagne ©2005Operating System Concep[r]

Operating Systems IssuesOperating Systems Issues The operating system must guarantee the specific data rate and timing requirements of continuous media. Such requirements are known as Quality-of-Service (QoS) guarantees.20.11Silberschatz, Galvin and Gagne ©2005Operating[r]