Document
... A computer system is connected with multiple input and output (I/O) devices, so that it can communicate with the end use. In order to interact with the I/O devices, the computer system requires special software called device driver. The device driver acts as a translator between the I/O devices and ...
... A computer system is connected with multiple input and output (I/O) devices, so that it can communicate with the end use. In order to interact with the I/O devices, the computer system requires special software called device driver. The device driver acts as a translator between the I/O devices and ...
Figure 11.01 - 醫學資訊系 鄭仁亮教授
... File-open count: counter of number of times a file is open – to allow removal of data from open-file table when last processes closes it Disk location of the file: cache of data access information Access rights: per-process access mode information ...
... File-open count: counter of number of times a file is open – to allow removal of data from open-file table when last processes closes it Disk location of the file: cache of data access information Access rights: per-process access mode information ...
No Slide Title
... This attribute contains the access token of the owner of the file, and an access control list that states the access privileges that are granted to each user that has access to the file. ...
... This attribute contains the access token of the owner of the file, and an access control list that states the access privileges that are granted to each user that has access to the file. ...
ch11
... File-open count: counter of number of times a file is open – to allow removal of data from open-file table when last processes closes it Disk location of the file: cache of data access information Access rights: per-process access mode information ...
... File-open count: counter of number of times a file is open – to allow removal of data from open-file table when last processes closes it Disk location of the file: cache of data access information Access rights: per-process access mode information ...
ch2
... Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux a ...
... Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux a ...
Windows Server 2008
... – Makes it difficult to determine the most current versions – Makes users spend unproductive time looking for specific files ...
... – Makes it difficult to determine the most current versions – Makes users spend unproductive time looking for specific files ...
3.2. The Process
... • Fork: A process in UNIX is created with the fork system call, which creates a copy of the process that invokes it. The process image is identical to that of the calling process, except for a few parameters like the PID. The child gets a new PID. • Exec: The forked child overwrites its own image w ...
... • Fork: A process in UNIX is created with the fork system call, which creates a copy of the process that invokes it. The process image is identical to that of the calling process, except for a few parameters like the PID. The child gets a new PID. • Exec: The forked child overwrites its own image w ...
System Management
... and makes the files unavailable to users during compaction. – Volume directory location • Affects retrieval time ...
... and makes the files unavailable to users during compaction. – Volume directory location • Affects retrieval time ...
A Tour of Computer Systems - Computer Systems: A Programmer`s
... In Chapter 3, we will introduce two related machine languages: IA32, the 32-bit code that has become ubiquitous on machines running Linux, Windows, and more recently the Macintosh operating systems, and x86-64, a 64-bit extension found in more recent microprocessors. We describe how compilers transl ...
... In Chapter 3, we will introduce two related machine languages: IA32, the 32-bit code that has become ubiquitous on machines running Linux, Windows, and more recently the Macintosh operating systems, and x86-64, a 64-bit extension found in more recent microprocessors. We describe how compilers transl ...
FAST-OS BOF SC 04 - Department of Computer Science
... Integration of OpenSSI with nodes with high processor counts The scalability of a shared root filesystem to 10,000 nodes Scalable booting and monitoring mechanisms Research enhancements to OpenSSI’s P2P communications The use of very large page sizes (superpages) for large address spaces Determine t ...
... Integration of OpenSSI with nodes with high processor counts The scalability of a shared root filesystem to 10,000 nodes Scalable booting and monitoring mechanisms Research enhancements to OpenSSI’s P2P communications The use of very large page sizes (superpages) for large address spaces Determine t ...
Operating Systems
... – share CPU (in time) and provide each app with a virtual processor, – allocate and protect memory, and provide applications with their own virtual address space, – present a set of (relatively) hardware independent virtual devices, – divide up storage space by using filing systems, and – do all thi ...
... – share CPU (in time) and provide each app with a virtual processor, – allocate and protect memory, and provide applications with their own virtual address space, – present a set of (relatively) hardware independent virtual devices, – divide up storage space by using filing systems, and – do all thi ...
Introducing Operating Systems
... • Operating System – Part of computer system (software) – Manages all hardware and software • Controls every file, device, section of main memory and nanosecond of processing time • Controls who can use the system • Controls how system is used Understanding Operating Systems, Fifth Edition ...
... • Operating System – Part of computer system (software) – Manages all hardware and software • Controls every file, device, section of main memory and nanosecond of processing time • Controls who can use the system • Controls how system is used Understanding Operating Systems, Fifth Edition ...
Operating-System Structures
... File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
... File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
Operating Systems and File Management 4 Operating System
... 4 File Management Metaphors Storage metaphors help you visualize and mentally organize the files on your disks and other storage devices ...
... 4 File Management Metaphors Storage metaphors help you visualize and mentally organize the files on your disks and other storage devices ...
What is an Operating System?
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Process Concept
... • “system call” == “a function call that invokes the operating system services” • These OS services typically written in a high-level language (C or C++), are isolated from the user programs. • OS provides service to user program via system calls. ...
... • “system call” == “a function call that invokes the operating system services” • These OS services typically written in a high-level language (C or C++), are isolated from the user programs. • OS provides service to user program via system calls. ...
Operating system structures
... User mode and kernel mode Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
... User mode and kernel mode Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
lecture2
... Security – defense of the system against internal and external attacks Huge range of attacks: denial-of-service (using all resources and keeping legitimate users out of the system), worms, viruses, identity theft, theft of service (unauthorized use of a system) On some systems an OS function, ...
... Security – defense of the system against internal and external attacks Huge range of attacks: denial-of-service (using all resources and keeping legitimate users out of the system), worms, viruses, identity theft, theft of service (unauthorized use of a system) On some systems an OS function, ...
Chapter 10 PowerPoint
... • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the file in a storage device – Size: number of bytes (or words, or bloc ...
... • Files have attributes, usually including the following: – Name: human-readable file name – Identifier: numeric identifier within the file system – Type: some systems formally support different file types – Location: address of the file in a storage device – Size: number of bytes (or words, or bloc ...
Operating Systems
... Blocking - process suspended until I/O completed – Easy to use and understand – Insufficient for some needs Nonblocking - I/O call returns as much as available – E.g., User interface that received keyboard input while processing and displaying data on the screen – One approach: Implemented via multi ...
... Blocking - process suspended until I/O completed – Easy to use and understand – Insufficient for some needs Nonblocking - I/O call returns as much as available – E.g., User interface that received keyboard input while processing and displaying data on the screen – One approach: Implemented via multi ...
2. Operating System Models
... divides the work that needs to be done among processes, giving each process memory, system resources, at-least one thread of execution, an executable unit within a process. The operating system runs one thread for a short time and then switches to another, running each thread in turn. Even on single ...
... divides the work that needs to be done among processes, giving each process memory, system resources, at-least one thread of execution, an executable unit within a process. The operating system runs one thread for a short time and then switches to another, running each thread in turn. Even on single ...
Improving Per-Node Efficiency in the Datacenter with New OS
... Ideally, applications would like both high throughput and low latency. With clever kernel scheduling and a large number of cores, an operating system can provide both. The Akaros kernel scheduler achieves this by using different time quanta on separate cores, based on their workload. In traditional ...
... Ideally, applications would like both high throughput and low latency. With clever kernel scheduling and a large number of cores, an operating system can provide both. The Akaros kernel scheduler achieves this by using different time quanta on separate cores, based on their workload. In traditional ...
Guide to Networking Essentials, Fifth Edition
... mapped drive letter with the correct network address of a directory share inside a resource request. directory service — A comprehensive network service that manages information about network services, resources, users, groups, and other objects, so that users can access resources and services by ...
... mapped drive letter with the correct network address of a directory share inside a resource request. directory service — A comprehensive network service that manages information about network services, resources, users, groups, and other objects, so that users can access resources and services by ...
Plan 9 from Bell Labs
Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.