Lecture3-os-support
... • And no need for hardware protection domains – everything can run in a single address space • Singularity: an OS from Microsoft implemented these concepts • ... End digression CMPT 401 © A. Fedorova ...
... • And no need for hardware protection domains – everything can run in a single address space • Singularity: an OS from Microsoft implemented these concepts • ... End digression CMPT 401 © A. Fedorova ...
Assignment0: Linux Basics and /proc
... Answer the following questions about the Linux machine that you will be using to do these exercises. If your school's lab has several machines, then choose one on which to base your answers. • What is the CPU type and model? • What version of the Linux kernel is being used? • How long (in days, hour ...
... Answer the following questions about the Linux machine that you will be using to do these exercises. If your school's lab has several machines, then choose one on which to base your answers. • What is the CPU type and model? • What version of the Linux kernel is being used? • How long (in days, hour ...
Adeyl Khan
... Only one process can receive the attention of the CPU at any given moment Effective because CPU speeds are many times faster than input/output speeds ...
... Only one process can receive the attention of the CPU at any given moment Effective because CPU speeds are many times faster than input/output speeds ...
System Call Implementation - Computer and Information Science
... parameter is the destination. This is always MM/FS. When kernel receives a system call request, what the kernel do is to send message to MM/FS. Actual work is done by MM/FS. The second parameter specifies the type of service. The ID is defined in /usr/include/minix/callnr.h . User program cannot cal ...
... parameter is the destination. This is always MM/FS. When kernel receives a system call request, what the kernel do is to send message to MM/FS. Actual work is done by MM/FS. The second parameter specifies the type of service. The ID is defined in /usr/include/minix/callnr.h . User program cannot cal ...
Chapter 13: I/O Systems - FSU Computer Science
... message modified as it flows through to device driver and back to process ...
... message modified as it flows through to device driver and back to process ...
Computer System Structure
... hierarchy. This requires data that is simultaneously stored in more than one level to be consistent. Dual-Mode Operation Sharing system resources requires operating system to ensure that an incorrect program cannot cause other programs to execute incorrectly. ...
... hierarchy. This requires data that is simultaneously stored in more than one level to be consistent. Dual-Mode Operation Sharing system resources requires operating system to ensure that an incorrect program cannot cause other programs to execute incorrectly. ...
Four Components of a Computer System
... System call – request to the OS to allow user to wait for I/ O completion" Device-status table contains entry for each I/O device indicating its type, address, and state" OS indexes into I/O device table to determine device status and to modify table entry to include interrupt" ...
... System call – request to the OS to allow user to wait for I/ O completion" Device-status table contains entry for each I/O device indicating its type, address, and state" OS indexes into I/O device table to determine device status and to modify table entry to include interrupt" ...
CITS2002 Systems Programming Complexity of I
... Which method is employed depends on the complexity of the I/O device: Programmed, or polled, I/O The processor issues an I/O-based instruction on behalf of the currently executing process. The process loops incessantly until the I/O request is satisfied. Of course, in a multi-programmed environment, ...
... Which method is employed depends on the complexity of the I/O device: Programmed, or polled, I/O The processor issues an I/O-based instruction on behalf of the currently executing process. The process loops incessantly until the I/O request is satisfied. Of course, in a multi-programmed environment, ...
OperatingSystems_FA15_3_Process
... New User logs in or new Batch Job is submitted. PCB with Process ID is created, but OS has not brought the job into memory. Example: OS has limit of number of processes (prevent performance degradation) or memory not available. ...
... New User logs in or new Batch Job is submitted. PCB with Process ID is created, but OS has not brought the job into memory. Example: OS has limit of number of processes (prevent performance degradation) or memory not available. ...
- Suraj @ LUMS
... System design is as much an art as it is science We are using an internal MIT textbook (6.033 classnotes) from Jerry Saltzer and Frans Kaashoek We’ll refer to a traditional textbook every so often ...
... System design is as much an art as it is science We are using an internal MIT textbook (6.033 classnotes) from Jerry Saltzer and Frans Kaashoek We’ll refer to a traditional textbook every so often ...
CPU-Scheduling
... method used to determine when to upgrade a process method used to determine when to demote a process method used to determine which queue a process will enter when that process needs service ...
... method used to determine when to upgrade a process method used to determine when to demote a process method used to determine which queue a process will enter when that process needs service ...
Lecture7
... of a file or file-like resource. This resource could be a file physically present on-disk, or a device, shared memory object, or other resource that the OS can reference through a file descriptor. Memory-mapped I/O uses the same address bus to address both memory and I/O devices, and the CPU instruc ...
... of a file or file-like resource. This resource could be a file physically present on-disk, or a device, shared memory object, or other resource that the OS can reference through a file descriptor. Memory-mapped I/O uses the same address bus to address both memory and I/O devices, and the CPU instruc ...
Threads - efreidoc.fr
... token) resources allocated to the process i.e. handles, one or more threads Threads are the units of execution – they execute program code using the processes context and resources ...
... token) resources allocated to the process i.e. handles, one or more threads Threads are the units of execution – they execute program code using the processes context and resources ...
Module 6: CPU Scheduling - University of South Florida
... 1. t n actual length of n th CPU burst 2. n 1 predicted value for the next CPU burst ...
... 1. t n actual length of n th CPU burst 2. n 1 predicted value for the next CPU burst ...
Chap 6: Virtual Memory
... • So - we can now run processes that are bigger than total memory available! • Main memory is called real memory • User/programmer sees much bigger memory virtual memory ...
... • So - we can now run processes that are bigger than total memory available! • Main memory is called real memory • User/programmer sees much bigger memory virtual memory ...
Unit 2
... Processor is running a process Interrupt occurs: current instruction is completed Processor determines nature of interrupt Process executes context switch to interrupt handler 5. Interrupt handler executes to completion 6. Next ready process is dispatched ...
... Processor is running a process Interrupt occurs: current instruction is completed Processor determines nature of interrupt Process executes context switch to interrupt handler 5. Interrupt handler executes to completion 6. Next ready process is dispatched ...
Section for Related Work % \section{Related Work} Rootkit detection
... generated by the earlier analysis to actively detect hooks at runtime. ...
... generated by the earlier analysis to actively detect hooks at runtime. ...
tasks, threads and processes, confused?
... requests. When the ISR is invoked, due to a demand for service from an external peripheral, it pre-‐empts the background loop and executes (this pre-‐emption and invocation is performed by the hardware). ...
... requests. When the ISR is invoked, due to a demand for service from an external peripheral, it pre-‐empts the background loop and executes (this pre-‐emption and invocation is performed by the hardware). ...
Operating System Structures
... A virtual machine provides multiprogramming only by providing exact virtual copies of the bare hardware . A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor with ...
... A virtual machine provides multiprogramming only by providing exact virtual copies of the bare hardware . A virtual machine provides an interface identical to the underlying bare hardware. The operating system creates the illusion of multiple processes, each executing on its own processor with ...
What is an Operating System?
... • Protection is needed for any shared resource. • Sharing system resources requires operating system to ensure that an incorrect program cannot cause other programs to execute incorrectly. ...
... • Protection is needed for any shared resource. • Sharing system resources requires operating system to ensure that an incorrect program cannot cause other programs to execute incorrectly. ...
Syllabus - Jordan University of Science and Technology
... Class lectures, lecture notes, and quizzes are designed to achieve the course objectives. You should read the assigned chapters before class, and participate in class and do whatever it takes for you to grasp this material. Also, ask any question related to O.S. You are responsible for all material ...
... Class lectures, lecture notes, and quizzes are designed to achieve the course objectives. You should read the assigned chapters before class, and participate in class and do whatever it takes for you to grasp this material. Also, ask any question related to O.S. You are responsible for all material ...
What Is Operating System? Operating Systems, System Calls, and Buffered I/O
... o User mode: can execute normal instructions and access only user memory o Supervisor mode: can execute normal instructions, privileged instructions and access all of memory (e.g., devices) ...
... o User mode: can execute normal instructions and access only user memory o Supervisor mode: can execute normal instructions, privileged instructions and access all of memory (e.g., devices) ...
COSC A365 Chapter 1
... Systems generally first distinguish among users, to determine who can do what User identities (user IDs, security IDs) include name and associated number, one per user User ID then associated with all files, processes of that user to ...
... Systems generally first distinguish among users, to determine who can do what User identities (user IDs, security IDs) include name and associated number, one per user User ID then associated with all files, processes of that user to ...