The Operating System
... Protection - ensuring that all access to system resources is controlled Security - user authentication, defending external I/O devices from invalid access attempts, etc. ...
... Protection - ensuring that all access to system resources is controlled Security - user authentication, defending external I/O devices from invalid access attempts, etc. ...
What is an Operating System?
... – Secondary storage limited or absent, data stored in shortterm memory, or read-only memory (ROM) – Conflicts with time-sharing systems, not supported by general-purpose operating systems. ...
... – Secondary storage limited or absent, data stored in shortterm memory, or read-only memory (ROM) – Conflicts with time-sharing systems, not supported by general-purpose operating systems. ...
Chapter 4 - Angelfire
... It needs to handle several file requests over a short period Hence more efficient to create (and destroy) a single thread for each request Such threads share files and variables In Symmetric Multiprocessing: different threads can possibly execute simultaneously on different processors Example 2: one ...
... It needs to handle several file requests over a short period Hence more efficient to create (and destroy) a single thread for each request Such threads share files and variables In Symmetric Multiprocessing: different threads can possibly execute simultaneously on different processors Example 2: one ...
ch02
... 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. ...
Arrakis: A Case for the End of the Empire
... What we need is something more: the ability to give any application direct access to its own virtual disk blocks from user space. Unlike a fixed disk partition, applications could request the kernel to extend or shrink their allocation, as they are able to do for main memory today. The disk device m ...
... What we need is something more: the ability to give any application direct access to its own virtual disk blocks from user space. Unlike a fixed disk partition, applications could request the kernel to extend or shrink their allocation, as they are able to do for main memory today. The disk device m ...
Osprey: Operating System for Predictable Clouds
... In order to successfully deploy a new cloud infrastructure, it is important to be able to execute legacy applications. There are several ways of supporting legacy applications in Osprey: legacy system emulation, library operating systems, and porting native runtime environments. These methods differ ...
... In order to successfully deploy a new cloud infrastructure, it is important to be able to execute legacy applications. There are several ways of supporting legacy applications in Osprey: legacy system emulation, library operating systems, and porting native runtime environments. These methods differ ...
ppt - METU
... If Requesti [j] = k then process Pi wants k instances of resource type Rj. 1. If Requesti Needi go to step 2. Otherwise, raise error condition, since process has exceeded its maximum claim. 2. If Requesti Available, go to step 3. Otherwise Pi must wait, since resources are not available. 3. Pret ...
... If Requesti [j] = k then process Pi wants k instances of resource type Rj. 1. If Requesti Needi go to step 2. Otherwise, raise error condition, since process has exceeded its maximum claim. 2. If Requesti Available, go to step 3. Otherwise Pi must wait, since resources are not available. 3. Pret ...
Distributed Operating Systems
... Developed by A.S. Tanenbaum (1983 onwards) as a research tool, it uses a large number of CPUs, . Communication via RPC and provides relatively good distributive transparency, security with efficient communication but suffers from a lack of user control Aim was to develop a transparent distributed op ...
... Developed by A.S. Tanenbaum (1983 onwards) as a research tool, it uses a large number of CPUs, . Communication via RPC and provides relatively good distributive transparency, security with efficient communication but suffers from a lack of user control Aim was to develop a transparent distributed op ...
OPERATING SYSTEM CONCEPTS
... assure proper file access. User programs could neither ensure adherence to protection methods nor be trusted to allocate only free blocks and deallocate blocks on file deletion. d. Communications. Message passing between systems requires messages to be turned into packets of information, sent to the ...
... assure proper file access. User programs could neither ensure adherence to protection methods nor be trusted to allocate only free blocks and deallocate blocks on file deletion. d. Communications. Message passing between systems requires messages to be turned into packets of information, sent to the ...
Lecture 3
... Exact type and amount of information vary according to OS and call 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 p ...
... Exact type and amount of information vary according to OS and call 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 p ...
BCS 404 Operating System
... Answer: B 70. The primary purpose of an operating system is: A. To make the most efficient use of the computer hardware B. To allow people to use the computer, C. To keep systems programmers employed D. To make computers easier to use Answer: A 71. A processor a) is a device that performs a sequence ...
... Answer: B 70. The primary purpose of an operating system is: A. To make the most efficient use of the computer hardware B. To allow people to use the computer, C. To keep systems programmers employed D. To make computers easier to use Answer: A 71. A processor a) is a device that performs a sequence ...
Operating Systems and File Management
... Boot and Recovery Disks • You can create a custom recovery CD that contains your computer’s current settings and device drivers • Norton Ghost is a product of Symantec, which also provides a more specialized recovery disk called the Symantec Recovery Disk • Certain PC manufacturers have pre-install ...
... Boot and Recovery Disks • You can create a custom recovery CD that contains your computer’s current settings and device drivers • Norton Ghost is a product of Symantec, which also provides a more specialized recovery disk called the Symantec Recovery Disk • Certain PC manufacturers have pre-install ...
Slide 3: Process Description and Control
... channels of the computer system At any given time, an I/O device may be available or assigned to a particular process ...
... channels of the computer system At any given time, an I/O device may be available or assigned to a particular process ...
ppt
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
Windows2000-Spr-2001-sect-2-group
... • Threads of lower priority are preempted so the higher priority threads can have access to the processor when they are ready • In the real time class, where all threads have a fixed priority that never changes, threads of equal priority are in a round-robin queue • In the variable priority class, a ...
... • Threads of lower priority are preempted so the higher priority threads can have access to the processor when they are ready • In the real time class, where all threads have a fixed priority that never changes, threads of equal priority are in a round-robin queue • In the variable priority class, a ...
1.01
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
System Call
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
2.01
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Chapter 2: Operating
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
Powerpoint format - Computer and Information Sciences
... – Assign idle processors – New arrivals may be assigned to a processor that is used by a job currently using more than one processor – Hold request until processor is available – New arrivals will be given a processor before existing running applications ...
... – Assign idle processors – New arrivals may be assigned to a processor that is used by a job currently using more than one processor – Hold request until processor is available – New arrivals will be given a processor before existing running applications ...
1.01 - University of South Florida
... Provide resource management and resource protection … by defining abstractions and limiting user control Exokernel paper says: Abstractions are costly, therefore OS operations are unnecessarily costly ...
... Provide resource management and resource protection … by defining abstractions and limiting user control Exokernel paper says: Abstractions are costly, therefore OS operations are unnecessarily costly ...
No Slide Title
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from a parent process Each object is protected by an access control list ...
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from a parent process Each object is protected by an access control list ...