lecture operating system chapter 06 - File Systems University of technology
Programming the Be Operating System-Chapter 9: Messages and Threads
... the poster of the message and the target of the message don’thave to be one and the same, they can be as shown in this snippet (read the 334 Chapter 9: Messages and Threads case MENU_ADV_HELP_MSG: ... looper and a handler). Throughout this chapter you’ll see sev-eral examples of the creating of messages and the dispatching of these messages both by the object that created them and by other ... alertString); The beepOnce variable will be used to specify whether or not a beep shouldaccompany the display of the alert. The alertString holds the text to be dis-played. Once created and set up, the...
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Programming the Be Operating System-Chapter 10: Files
... application data member. The Save file panel, on the other hand,affects the window, and is referenced by a window data member. So I want the message sent to the window object rather than the application ... node (data). The entry can be represented by an entry_ref ora BEntry object. Currently the entry is in the form of an entry_ref. Here the entry is stored in a BEntry object. The BEntry function ... /boot/myDir/). The BEntry func-tion GetPath() is used to store the BEntry information as a BPath object. Here the BPath object path is first set to the directory, then the filename is appendedto the directory:...
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Chapter-10-File systems and devices
... ifconfigprogram.Traditional UNIX systems distinguish twotypes of device, blockdevices and character devices. FreeBSD no longer has block devices; we discussed the reasons for this on page35.In traditional UNIX systems, ... file systems across a network.We’lllook at it in Chapter 25.ã FreeBSD supports a number of le systems from other popular operating systems. Youmount the file systems with the mount command and ... (2003/04/02 06:43:57) 195 Chapter 10: File systems and devices 2April 2003, 17:00:47 The Complete FreeBSD (filesys.mm), page 195FreeBSD devices UNIX refers to devices in the same manner as it refers...
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Tài liệu Programming the Be Operating System-Chapter 1: BeOS Programming Overview ppt
... unimportant. 2 Chapter 1: BeOS Programming Overview to appear almost daily, and each company needs some way to ensure that the public views their product as the best. Unsurprisingly, the BeOS is also accompa-nied ... uses all of the BeOS kits, it’s a good idea to at least have anidea of the purpose of each. The kits of the BeOS are subject to change. As the BeOS matures,new functionality will be added. This ... 1: BeOS Programming Overview to handle access to all the various keyboards, mice, joysticks, and other inputdevices that may be connected to a machine running the BeOS. Another serveris the...
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lecture operating system chapter 01 - university of technology
... Operating System ZooãMainframe operating systemsãServer operating systemsãMultiprocessor operating systemsãPersonal computer operating systemsãReal-time operating systemsãEmbedded operating ... 1Introduction Chapter 11.1 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 ... computers6History of Operating Systems (3)ãStructure of a typical FMS job – 2nd generation7History of Operating Systems (4)ãMultiprogramming system three jobs in memory 3rd generation8The Operating...
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lecture operating system chapter 02 - Processes and Threads University of technology
... layer of process-structured OShandles interrupts, schedulingãAbove that layer are sequential processes 8Implementation of Processes (1)Fields of a process table entry9Implementation of Processes ... 1 Processes and Threads Chapter 22.1 Processes 2.2 Threads 2.3 Interprocess communication2.4 Classical IPC problems2.5 Scheduling2 Processes The Process ModelãMultiprogramming of four ... threads package18Implementing Threads in the KernelA threads package managed by the kernel19Hybrid Implementations Multiplexing user-level threads onto kernel- level threads 20Scheduler ActivationsãGoal...
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lecture operating system chapter 03 - Deadlocks
... 1 Deadlocks Chapter 3 3.1. Resource 3.2. Introduction to deadlocks 3.3. The ostrich algorithm 3.4. Deadlock detection and ... same time another process holds B and requests Aboth are blocked and remain so3Resources (1)ã Deadlocks occur when processes are granted exclusive access to devices–we refer to these devices ... request is denied–requesting process may be blocked–may fail with error code5Introduction to Deadlocks ãFormal definition :A set of processes is deadlocked if each process in the set is waiting...
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lecture operating system chapter 04 - Memory Management
... 1 Memory Management Chapter 44.1 Basic memory management 4.2 Swapping4.3 Virtual memory 4.4 Page replacement algorithms4.5 Modeling page replacement algorithms4.6 Design issues for paging systems4.7 ... Segmentation2 Memory Management ãIdeally programmers want memory that islargefastnon volatileã Memory hierarchy small amount of fast, expensive memory cache –some medium-speed, medium ... cache –some medium-speed, medium price main memory –gigabytes of slow, cheap disk storageã Memory manager handles the memory hierarchy3Basic Memory Management Monoprogramming without Swapping...
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lecture operating system chapter 05 - Input/Output University of technology
... 1 Input/Output Chapter 55.1 Principles of I/O hardware5.2 Principles of I/O software5.3 I/O software layers5.4 Disks5.5 Clocks5.6 Character-oriented terminals5.7 ... in the kernel21Device-Independent I/O Software (4)Networking may involve many copies22User-Space I/O Software Layers of the I/O system and the main functions of each layer23DisksDisk ... position of device drivers is shown hereãCommunications between drivers and device controllers goes over the bus18Device-Independent I/O Software (1)Functions of the device-independent I/O softwareUniform...
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lecture operating system chapter 06 - File Systems University of technology
... 1 File Systems Chapter 66.1 Files 6.2 Directories 6.3 File system implementation 6.4 Example file systems 2Long-term Information StorageãMust store large amounts of dataãInformation ... Link8. Unlink17 File System ImplementationA possible file system layout18Implementing Files (1)(a) Contiguous allocation of disk space for 7 files(b) State of the disk after files D and E ... i-node23Implementing Directories (2)ãTwo ways of handling long file names in directory–(a) In-line–(b) In a heap24Shared Files (1) File system containing a shared file 25Shared Files...
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lecture operating system chapter 07 - Multimedia University of technology
... (2)MPEG-2 has three kinds of frame: I, P, B1. Intracoded frames - Self-contained JPEG-encoded pictures2. Predictive frames - Block-by-block difference with last frame3. Bi-directional frames - Differences ... 1 Multimedia Chapter 77.1 Introduction to multimedia 7.2 Multimedia files 7.3 Video compression 7.4 Multimedia process scheduling 7.5 Multimedia file system paradigms 7.6 ... (2)Trade-offs between small, large blocks1. Frame index - heavier RAM usage during movie play - little disk wastageãBlock index (no splitting frames over blocks) - low RAM usage - major disk...
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lecture operating system chapter 08 - Multiple Prosessor Systems University of technology
... Multiple Processor Systems Chapter 88.1 Multiprocessors 8.2 Multicomputers 8.3 Distributed systems Multiprocessor Systems ãContinuous need for faster ... memory via commands - LOAD - STORE3. Access to remote memory slower than to localMultiprocessor Hardware (6)(a) 256-node directory based multiprocessor(b) Fields of 32-bit memory address(c) ... Hardware (2)ãSwitching schemestore-and-forward packet switchingMulticomputer Hardware (3)Network interface boards in a multicomputerLow-Level Communication Software (1)ãIf several processes...
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lecture operating system chapter 09 Security
... 1 Security Chapter 99.1 The security environment 9.2 Basics of cryptography 9.3 User authentication 9.4 Attacks from inside the system 9.5 Attacks from outside the system 9.6 ... database of all loginsãSimple login name/password as a trap– security personnel notified when attacker bites17 Operating System Security Trojan HorsesãFree program made available to unsuspecting ... 9.5 Attacks from outside the system 9.6 Protection mechanisms 9.7 Trusted systems 2The Security EnvironmentThreats Security goals and threats3IntrudersCommon Categories1. Casual prying...
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lecture operating system chapter 10 case study; UNIX and Linux
... 1 Case Study 1: UNIX and LINUX Chapter 10 10.1 History of unix 10. 2 Overview of unix 10. 3 Processes in unix 10. 4 Memory management in unix 10. 5 Input/output in unix 10. 6 The unix file system ... file system 10. 7 Security in unix 2 UNIX The layers of a UNIX system. Us erInter face3 UNIX Utility ProgramsA few of the more common UNIX utility programs required by POSIX4 UNIX KernelApproximate ... terminal22 UNIX I/O (1)Some of the fields of a typical cdevsw table23 UNIX I/O (2)The UNIX I/O system in BSD24StreamsAn example of streams in System V25The UNIX File System (1)Some...
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chapter 12 operating system - university of technology
... 1 Operating System Design Chapter 12 12.1 The nature of the design problem 12. 2 Interface design 12. 3 Implementation 12. 4 Performance 12. 5 Project management 12. 6 Prends in operating system ... byte10Space-Time Trade-offs (2)ãA macro to count the bitsãA macro to access bit count in a table(b) Macro to count the bytes(c) Macro to look up the count11Space-Time Trade-offs (3)(a) Part of ... palate12CachingPart of an i-node cache13Software team StructureMills’ proposal for populating a 10-person chief programmer team14The Role of Experience (1)Traditional software design progresses...
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