Chapter-3-OpratingSystemSupport
... But network operating system are in wide use for various reasons both technical and non-technical. Users have much invested in their application software; they will not adopt a new operating system that will not run their applications. ...
... But network operating system are in wide use for various reasons both technical and non-technical. Users have much invested in their application software; they will not adopt a new operating system that will not run their applications. ...
Chapter3 - Computer Strcuture
... The system call is translated into a trap instruction the trap instruction is a machine level instruction that is part of the instruction set of the processor The trap instruction will do the following: change mode-bit to supervisor mode jump to a trap handler which will determine which OS ...
... The system call is translated into a trap instruction the trap instruction is a machine level instruction that is part of the instruction set of the processor The trap instruction will do the following: change mode-bit to supervisor mode jump to a trap handler which will determine which OS ...
Module 4: Processes
... A process may not be in exactly two states when there are more than one processes. For example, when one process has completed its I/O, its can’t get back to CPU because another process may be using it. So this process is ready but can’t run. ...
... A process may not be in exactly two states when there are more than one processes. For example, when one process has completed its I/O, its can’t get back to CPU because another process may be using it. So this process is ready but can’t run. ...
Exam Review Sarah Diesburg Operating Systems CS 3430
... Operating system Job Batch system Timesharing ...
... Operating system Job Batch system Timesharing ...
GNU
... the freedom to improve the program, and release the improvements to the public (Access to the source code is a precondition for this) ...
... the freedom to improve the program, and release the improvements to the public (Access to the source code is a precondition for this) ...
Shim
... and it manages process identities. Potential attack: A malicious OS might try to redirect the results of a process, the process return value or other information, to a wrong process. Proposed solution: Overshadow uses its own protected table for the process’s signal handlers and hypercall to ensure ...
... and it manages process identities. Potential attack: A malicious OS might try to redirect the results of a process, the process return value or other information, to a wrong process. Proposed solution: Overshadow uses its own protected table for the process’s signal handlers and hypercall to ensure ...
Chapter 2 Operating Systems Concepts
... Major Kernel Subinterfaces • Process management • File and I/O device management – I/O devices are treated as files (makes programs device independent) • Interprocess communication (IPC) – May be local or remote – Two models: message passing, shared memory ...
... Major Kernel Subinterfaces • Process management • File and I/O device management – I/O devices are treated as files (makes programs device independent) • Interprocess communication (IPC) – May be local or remote – Two models: message passing, shared memory ...
Operating Systems I: Chapter 2
... When executing in monitor mode, the operating system has unrestricted access to both monitor and user’s memory. The load instructions for the base and limit registers are ...
... When executing in monitor mode, the operating system has unrestricted access to both monitor and user’s memory. The load instructions for the base and limit registers are ...
2007-06.pdf
... Such an address consists of at least two parts: an index into a page table, and an offset into a page. The index is used to lookup which page frame is associated with the address, if any. If there is no associated page frame, this means that the data is stored on disk and needs to be swapped in. At ...
... Such an address consists of at least two parts: an index into a page table, and an offset into a page. The index is used to lookup which page frame is associated with the address, if any. If there is no associated page frame, this means that the data is stored on disk and needs to be swapped in. At ...
Using Linux Kernel Modules For Operating Systems Class Projects
... competency with C and Unix and to establish basic concepts which would be used in later projects. Four projects involving Linux kernel modules were used. The first project is to develop a simple shell using the fork() and execv() system calls to learn about process creation. This is Lab 2.1 as desc ...
... competency with C and Unix and to establish basic concepts which would be used in later projects. Four projects involving Linux kernel modules were used. The first project is to develop a simple shell using the fork() and execv() system calls to learn about process creation. This is Lab 2.1 as desc ...
int_unix - Pablo Manalastas, PhD
... The shell program /bin/sh accepts commands typed by the user and causes the execution of those commands. It is the go-between the user and the facilities of the Unix kernel. Some of its functions are: Filename completion – you supply a pattern and the shell gets all files that fit the pattern; ...
... The shell program /bin/sh accepts commands typed by the user and causes the execution of those commands. It is the go-between the user and the facilities of the Unix kernel. Some of its functions are: Filename completion – you supply a pattern and the shell gets all files that fit the pattern; ...
Najwa Knefati operating system chapter 1
... One main CPU: instruction set, other special-purpose processors :( device-specific processors like keyboard and general-purpose processors, such as I/O processors). Special-purpose processors: run a limited instruction set and do not run user processes: 1- Managed by the operating system: EX: a disk ...
... One main CPU: instruction set, other special-purpose processors :( device-specific processors like keyboard and general-purpose processors, such as I/O processors). Special-purpose processors: run a limited instruction set and do not run user processes: 1- Managed by the operating system: EX: a disk ...
Module 3: Processes and Process management
... explain how a process comes into existence and how processes are managed. A process in execution needs resources like processing resource, memory and IO resources. Current machines allow several processes to share resources. In reality, one processor is shared amongst many processes. In the first mo ...
... explain how a process comes into existence and how processes are managed. A process in execution needs resources like processing resource, memory and IO resources. Current machines allow several processes to share resources. In reality, one processor is shared amongst many processes. In the first mo ...
Processes
... creates a new address space (called the child) copies the parent’s address space into the child’s starts a new thread of control in the child’s address space parent and child are equivalent -- almost • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allow ...
... creates a new address space (called the child) copies the parent’s address space into the child’s starts a new thread of control in the child’s address space parent and child are equivalent -- almost • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allow ...
COS 318: Operating Systems I/O Device and Drivers
... Initialization resources for read or write and release resources ...
... Initialization resources for read or write and release resources ...
Overview of OS/2
... OS/2 supports the FAT file system used by DOS, and consequently can read and write DOS files. Although this capability is desirable from compatibility and migration standpoints, the FAT file system was not originally designed to support many concurrent I/O requests from different processes on large ...
... OS/2 supports the FAT file system used by DOS, and consequently can read and write DOS files. Although this capability is desirable from compatibility and migration standpoints, the FAT file system was not originally designed to support many concurrent I/O requests from different processes on large ...
Document
... ∗ memory mapping • interrupts – used by device for asynchronous notification (e.g., of request completion) – handled by interrupt handlers in the operating system ...
... ∗ memory mapping • interrupts – used by device for asynchronous notification (e.g., of request completion) – handled by interrupt handlers in the operating system ...
Processes
... New: The process is begin created Running: Instructions are being executed Waiting: The process is waiting for some event to occur (such as an I/O completion or reception of a ...
... New: The process is begin created Running: Instructions are being executed Waiting: The process is waiting for some event to occur (such as an I/O completion or reception of a ...
Xiuxian Chen
... Turnaround time: From the point of view of a particular process, the important criterion is how long it takes to execute that process. The interval from the time of submission of a process to the time of completion is the turnaround time. Turnaround time is the sum of the periods spent waiting to ge ...
... Turnaround time: From the point of view of a particular process, the important criterion is how long it takes to execute that process. The interval from the time of submission of a process to the time of completion is the turnaround time. Turnaround time is the sum of the periods spent waiting to ge ...
A1_OS Review_SP09
... Operational concepts that allow the operating system to maintain control and protection. Based on hardware features. ...
... Operational concepts that allow the operating system to maintain control and protection. Based on hardware features. ...
dsk-03-sched
... When it gains CPU, job receives 8 milliseconds. If it does not finish in 8 milliseconds, job is moved to queue Q1. – At Q1 job is again served FCFS and receives 16 additional milliseconds. If it still does not complete, it is preempted and moved to queue Q2. ...
... When it gains CPU, job receives 8 milliseconds. If it does not finish in 8 milliseconds, job is moved to queue Q1. – At Q1 job is again served FCFS and receives 16 additional milliseconds. If it still does not complete, it is preempted and moved to queue Q2. ...
Week 5 - Portland State University
... set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do not have privilege to set it, how can they invoke the OS so that it can run with the mode bit set? That’s what traps do … set the mode bit and begin execution at a specific point in memory (in the ...
... set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do not have privilege to set it, how can they invoke the OS so that it can run with the mode bit set? That’s what traps do … set the mode bit and begin execution at a specific point in memory (in the ...
Lecture17
... Slab one or more physically contiguous pages Cache of one or more slabs. Single cache for each unique kernel data ...
... Slab one or more physically contiguous pages Cache of one or more slabs. Single cache for each unique kernel data ...
PPT - Course Website Directory
... User app main program; calls kernel for services OS main program; calls user programs as subroutines ...
... User app main program; calls kernel for services OS main program; calls user programs as subroutines ...
11. Kernel Design
... Caches for special-purpose pools of memory (of fixed size) Learn from previous (de)allocations and anticipate future requests Optimizations for short-lived memory needs I I I ...
... Caches for special-purpose pools of memory (of fixed size) Learn from previous (de)allocations and anticipate future requests Optimizations for short-lived memory needs I I I ...