Authentication is the process of determining whether someone or
... A form of memory organization that allows 202 swapping of programs between memory and magnetic storage to give the impression of a larger main memory than really exists. The operating system manages virtual address spaces and the assignment of real memory to virtual memory. ...
... A form of memory organization that allows 202 swapping of programs between memory and magnetic storage to give the impression of a larger main memory than really exists. The operating system manages virtual address spaces and the assignment of real memory to virtual memory. ...
gst_115_9
... networking devices, are physical devices which are required for communication and interaction between devices on a computer network. Specifically, they mediate data in a computer network. Units which are the last receiver or generate data are called hosts or data terminal equipment. ...
... networking devices, are physical devices which are required for communication and interaction between devices on a computer network. Specifically, they mediate data in a computer network. Units which are the last receiver or generate data are called hosts or data terminal equipment. ...
Fundamental Concepts
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, traps if it executes a privileged instruction). K. Salah ...
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, traps if it executes a privileged instruction). K. Salah ...
Document
... The OS controls and schedules processes. It handles interrupts, and prioritises tasks ...
... The OS controls and schedules processes. It handles interrupts, and prioritises tasks ...
lecture31-dec11
... • Claim edge converts to request edge when a process requests a resource. • Request edge converted to an assignment edge when the resource is allocated to the process. • When a resource is released by a process, assignment edge reconverts to a claim edge. • Resources must be claimed a priori in the ...
... • Claim edge converts to request edge when a process requests a resource. • Request edge converted to an assignment edge when the resource is allocated to the process. • When a resource is released by a process, assignment edge reconverts to a claim edge. • Resources must be claimed a priori in the ...
Operating Systems I: Chapter 4
... In a multiple threaded task, while one server thread is blocked and waiting, a second thread in the same task can run. – Threads provide a mechanism that allow sequential processes to make blocking system calls while also achieving parallelism. – Cooperation of multiple threads in same job confers h ...
... In a multiple threaded task, while one server thread is blocked and waiting, a second thread in the same task can run. – Threads provide a mechanism that allow sequential processes to make blocking system calls while also achieving parallelism. – Cooperation of multiple threads in same job confers h ...
Linux - Rock Fort Networks
... any other operating system.[citation needed] It is a leading operating system on servers and other big iron systems such as mainframe computers and supercomputers. Although not released until 1992 due to legal complications, development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, ...
... any other operating system.[citation needed] It is a leading operating system on servers and other big iron systems such as mainframe computers and supercomputers. Although not released until 1992 due to legal complications, development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, ...
File
... Cooperative Linux, a port of the Linux kernel that allows it to run as an unprivileged lightweight virtual machine in kernel mode, on top of another OS kernel. Uses the concept of Cooperative Virtual Machine (CVM) Contains special Windows drivers, which allow it to run under Windows XP as a guest op ...
... Cooperative Linux, a port of the Linux kernel that allows it to run as an unprivileged lightweight virtual machine in kernel mode, on top of another OS kernel. Uses the concept of Cooperative Virtual Machine (CVM) Contains special Windows drivers, which allow it to run under Windows XP as a guest op ...
CMPU1022 Operating Systems 1
... 9. Discuss networked, client-server and distributed operating systems and how they differ from single user operating systems 10. Display and perform proficient command line interaction with various operating systems ...
... 9. Discuss networked, client-server and distributed operating systems and how they differ from single user operating systems 10. Display and perform proficient command line interaction with various operating systems ...
File
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
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 ...
Module 4: Processes
... If the mix contains too many computationally-oriented jobs, the I/O waiting queue may be empty; I/O devices unused, and system load unbalanced. This too is bad. These tend to be more scientific or engineering type jobs where there may be a lot of computations rather than lots of input/output. ...
... If the mix contains too many computationally-oriented jobs, the I/O waiting queue may be empty; I/O devices unused, and system load unbalanced. This too is bad. These tend to be more scientific or engineering type jobs where there may be a lot of computations rather than lots of input/output. ...
Chapter 1 Operating System Fundamentals
... a client/server relationship. • A server offers network services, such as e-mail to other programs called clients. • Once enabled, a server program waits to receive requests from client programs. If a legitimate request is received, the server responds by sending the appropriate information back to ...
... a client/server relationship. • A server offers network services, such as e-mail to other programs called clients. • Once enabled, a server program waits to receive requests from client programs. If a legitimate request is received, the server responds by sending the appropriate information back to ...
1: Welcome and Overview COM S 414
... Concrete Example: Intel CPU During OS initialization: Interrupt Descriptor Table (IDT) loaded with handlers for each kind of interrupt System call is interrupt vector 128 (0x80) Kernel code segment is set to have privilege level 0 (user code runs at 3) Entry in IDT corresponding to vector ...
... Concrete Example: Intel CPU During OS initialization: Interrupt Descriptor Table (IDT) loaded with handlers for each kind of interrupt System call is interrupt vector 128 (0x80) Kernel code segment is set to have privilege level 0 (user code runs at 3) Entry in IDT corresponding to vector ...
eFS: encrypted File system
... Password Security – Does nothing to preventing a disk being mounted on a different system and reading the contents. ...
... Password Security – Does nothing to preventing a disk being mounted on a different system and reading the contents. ...
Operating Systems
... To handle multiple processes and jobs, the process manager uses queues (waiting lists). A job control block or process control block is associated with each job or process. This is a block of memory that stores information about that job or process. The process manager stores the job or process cont ...
... To handle multiple processes and jobs, the process manager uses queues (waiting lists). A job control block or process control block is associated with each job or process. This is a block of memory that stores information about that job or process. The process manager stores the job or process cont ...
PowerPoint
... Other services provided by user-space programs called servers Originally developed at Carnegie Mellon University to support ...
... Other services provided by user-space programs called servers Originally developed at Carnegie Mellon University to support ...
Cindy - Anatomy of a Window
... Identify the different types of operating system interfaces Identify the different components of an operating system Understand and identify the different file systems ...
... Identify the different types of operating system interfaces Identify the different components of an operating system Understand and identify the different file systems ...
Module 3: Operating
... – in case of errors: print message and exit – if no error: a loop where characters are read from file1 and copied to file2 (2 system calls, with possible errors returned in case of a problem, such as space on disk exhausted) – close both files – terminate ...
... – in case of errors: print message and exit – if no error: a loop where characters are read from file1 and copied to file2 (2 system calls, with possible errors returned in case of a problem, such as space on disk exhausted) – close both files – terminate ...
PDF
... System call instruction executed with a parameter than designates specific call desired and any other parameters needed The state of the user program is saved so that it can be restored (context switch to the OS) Control passed to an OS procedure to accomplish the task and mode bit changed! OS proce ...
... System call instruction executed with a parameter than designates specific call desired and any other parameters needed The state of the user program is saved so that it can be restored (context switch to the OS) Control passed to an OS procedure to accomplish the task and mode bit changed! OS proce ...