Operating systems internals and design principles 7th edition william stallings test bank

... is an operating system running on the hardware platform Platforms and the operating systems of client and server may differ These lower-level differences are irrelevant as long as a client and ... procedure call/return semantics • • Widely accepted Standardized – Client and server modules can be moved among computers and operating systems easily Remote Procedure Call Mecha...

Ngày tải lên: 16/05/2017, 13:42

... channels, main and secondary memory, devices, and data structures such as files, databases, and semaphores • Deadlock occurs if each process holds one resource and requests the other Reusable Resources ... preemption Hold and wait Existence of Deadlock • • • • Mutual Exclusion No preemption Hold and wait Circular wait Deadlock Prevention • Mutual Exclusion – Must be supported by t...

Ngày tải lên: 16/05/2017, 13:52

... Segmentation The need for memory management • Memory is cheap today, and getting cheaper – But applications are demanding more and more memory, there is never enough! • Memory Management, involves ... variable length and number Process is allocated exactly as much memory as required Dynamic Partitioning Example OS (8M) P2 P1 (14M) (20M) Empty (6M) Empty (56M) P4(8M) P2 (14M) Empty (6M)...

Ngày tải lên: 16/05/2017, 13:52

... Memory • Hardware must support paging and segmentation • Operating system must be able to manage the movement of pages and/ or segments between secondary memory and main memory Paging • Each process ... Roadmap • • • • • Hardware and Control Structures Operating System Software UNIX and Solaris Memory Management Linux Memory Management Windows Memory ... Address Translation Prote...

Ngày tải lên: 16/05/2017, 13:52

... real time deadlines) Types of Scheduling Two Suspend States • Remember this diagram from Chapter Scheduling and Process State Transitions Nesting of Scheduling Functions Queuing Diagram Long-Term ... differentiate between user and system criteria User-oriented – Response Time • • Elapsed time between the submission of a request until there is output System-oriented – Effective and eff...

Ngày tải lên: 16/05/2017, 13:52

... smoothes out peaks in I/O demand – But with enough demand eventually all buffers become full and their advantage is lost • However, when there is a variety of I/O and process activities to service, ... Logical structure and operations • Physical organisation] – Converts logical names to physical addresses Roadmap – I/O Devices – Organization of the I/O Function – Operating System Des...

Ngày tải lên: 16/05/2017, 13:53

... structures • Provides a standard interface between applications and the file systems and devices that hold the data • Access method varies depending on the ways to access and process data for the ... I/O initiation and termination • Control structures deal with • Device I/O, • Scheduling, • File status • Selects and schedules I/O with the device Logical I/O • Enables users and a...

Ngày tải lên: 16/05/2017, 13:53

... Embedded Systems Characteristics of Embedded Operating Systems eCos TinyOS Embedded System • One of the most important and widely used categories of operating systems • • • Hardware and software designed ... multiprocessing) – Spinlocks Mutexes Mutexes and Condition Variables Mutexes and Condition Variables Roadmap • • • • Embedded Systems Characteristics of Embedded Oper...

Ngày tải lên: 16/05/2017, 13:53

... Security Concepts Threats, Attacks, and Assets Intruders Malicious Software Overview Viruses, Worms, and Bots Rootkits Security definition • The NIST Computer Security Handbook defines computer security ... Overview Viruses, Worms, and Bots Rootkits Intruders • Three main classes of intruders: Masquerader, – Typically an outsider Misfeasor – Often an insider and legitimate user Clande...

Ngày tải lên: 16/05/2017, 13:53

... Threshold random walk (TRW) scan detection Rate limiting Rate halting Botnet and Rootkit Countermeasures • IDS and Anti-Viral techniques are useful against bots – Main aim is to detect and disable ... Intrusion detection: – A security service that monitors and analyzes system events to find intrusions and provide alerts Intrusion Detection Systems (IDS) • Host-based – Monitors a s...

Ngày tải lên: 16/05/2017, 13:53

... store program and data files Cache Memory • • Processor speed faster than memory access speed Exploit the principle of locality with a small fast memory Cache and Main Memory Cache Principles • ... memory, and I/O modules Computer Components: Top-Level View Processor Registers • User-visible registers – Enable programmer to minimize main memory references by optimizing register use •...

Ngày tải lên: 16/05/2017, 14:03

... Evolution of Operating Systems • Serial processing – No operating system – Machines run from a console with display lights, toggle switches, input device, and printer Evolution of Operating Systems ... included loading the compiler, source program, saving compiled program, and loading and linking Evolution of Operating Systems • Simple batch system – Monitor • Software tha...

Ngày tải lên: 16/05/2017, 14:03