COS 318: Operating Systems I/O Device and Drivers
... A process issues a read call which executes a system call System call code checks for correctness and buffer cache If it needs to perform I/O, it will issue a device driver call Device driver allocates a buffer for read and schedules I/O Initiate DMA read transfer Block the current process and sched ...
... A process issues a read call which executes a system call System call code checks for correctness and buffer cache If it needs to perform I/O, it will issue a device driver call Device driver allocates a buffer for read and schedules I/O Initiate DMA read transfer Block the current process and sched ...
第五章
... resources of the parent process( address space, files, signalhandling, etc.) Pthread implementation on linux (pthread_create) makes use of clone,hence do_fork， to create threads(lightweight processes) Hence pthread in linux is implemented as lightweight process But it does not completely conform to ...
... resources of the parent process( address space, files, signalhandling, etc.) Pthread implementation on linux (pthread_create) makes use of clone,hence do_fork， to create threads(lightweight processes) Hence pthread in linux is implemented as lightweight process But it does not completely conform to ...
Operating Systems
... – All other threads are forced to wait on entry – When one thread leaves the critical section, another can enter do { entry section CRITICAL SECTION exit section REMAINDER SECTION } while (TRUE); ...
... – All other threads are forced to wait on entry – When one thread leaves the critical section, another can enter do { entry section CRITICAL SECTION exit section REMAINDER SECTION } while (TRUE); ...
Project 2, Linux Kernel Hacking
... Implementing getprinfo System Call • Add after helloworld system call from Part 1 • Copy prinfo.h to include/linux in kernel tree • Implement kernel/prinfo.c – Edit kernel/Makefile to add prinfo.o ...
... Implementing getprinfo System Call • Add after helloworld system call from Part 1 • Copy prinfo.h to include/linux in kernel tree • Implement kernel/prinfo.c – Edit kernel/Makefile to add prinfo.o ...
operating system functions
... 10. The OS finds out the disk drive, which has caused the interrupt then finds out the program for which the I/O was completed. 11. The OS reactivates Ap-1 by making it ready for execution. 12. Both AP-1 &AP-2 are in the list of ready process. The OS chooses any one of them based on scheduling polic ...
... 10. The OS finds out the disk drive, which has caused the interrupt then finds out the program for which the I/O was completed. 11. The OS reactivates Ap-1 by making it ready for execution. 12. Both AP-1 &AP-2 are in the list of ready process. The OS chooses any one of them based on scheduling polic ...
How do Users and Processes interact with the Operating System
... Typically, operating systems will offer the following internal services: Error handling: what if our process attempts a divide by zero or tries to access a protected region of memory, or if a device fails? Resource allocation: Processes may compete for resources such as the CPU, memory, and I/O devi ...
... Typically, operating systems will offer the following internal services: Error handling: what if our process attempts a divide by zero or tries to access a protected region of memory, or if a device fails? Resource allocation: Processes may compete for resources such as the CPU, memory, and I/O devi ...
Multiprocessing with the Exokernel Operating System - PDOS
... specific extensions. To ensure safety, these systems often apply restrictions on where and how extensions can be inserted and executed. In comparison, the exokernel approach to extensibility provides more power: an exokernel only securely multiplexes available hardware, leaving all system abstractio ...
... specific extensions. To ensure safety, these systems often apply restrictions on where and how extensions can be inserted and executed. In comparison, the exokernel approach to extensibility provides more power: an exokernel only securely multiplexes available hardware, leaving all system abstractio ...
PPT Chapter 01
... • OS decides a priori what resources to allocate to each user program; divides system resources into partitions – A resource partition is a collection of resources • Resource table contains entries for partitions • Simple to implement, but lacks flexibility ...
... • OS decides a priori what resources to allocate to each user program; divides system resources into partitions – A resource partition is a collection of resources • Resource table contains entries for partitions • Simple to implement, but lacks flexibility ...
ppt - CS162
... (good for sharing, bad for protection) – Threads can share instructions (good for sharing, bad for protection) – Can threads overwrite OS functions? ...
... (good for sharing, bad for protection) – Threads can share instructions (good for sharing, bad for protection) – Can threads overwrite OS functions? ...
Syllabus - Regis University: Academic Web Server for Faculty
... CS 431 – OPERATING SYSTEMS ANALYSIS/DESIGN (3). Studies basic facilities provided in modern operating systems including processor scheduling, memory management, and file systems. Topics include: deadlock detection, paging, concurrency, thread, disk scheduling, caching, and virtual machines. ...
... CS 431 – OPERATING SYSTEMS ANALYSIS/DESIGN (3). Studies basic facilities provided in modern operating systems including processor scheduling, memory management, and file systems. Topics include: deadlock detection, paging, concurrency, thread, disk scheduling, caching, and virtual machines. ...
Input and Output Optimization in Linux for Appropriate Resource
... create the I/O node, each one sought to optimize the Linux operating system through aggregation. These techniques are building on one another in order to achieve similar goals. Additionally, the last source concerning I/O scheduling built on the idea of the Linux anticipatory scheduler. This demonst ...
... create the I/O node, each one sought to optimize the Linux operating system through aggregation. These techniques are building on one another in order to achieve similar goals. Additionally, the last source concerning I/O scheduling built on the idea of the Linux anticipatory scheduler. This demonst ...
Principles of Operating Systems
... ¾ Benefits of multithreading compared to multitasking 9 it takes less time to create a new thread than a new process 9 it takes less time to terminate a thread than a process 9 it takes less time to switch between two threads within the same process than between two processes 9 threads within the sa ...
... ¾ Benefits of multithreading compared to multitasking 9 it takes less time to create a new thread than a new process 9 it takes less time to terminate a thread than a process 9 it takes less time to switch between two threads within the same process than between two processes 9 threads within the sa ...
Ch01 - Min-Shiang Hwang
... to maximize “resource utilization”, to that all available CPU time, memory, and I/O are used efficiently, and that no individual user ...
... to maximize “resource utilization”, to that all available CPU time, memory, and I/O are used efficiently, and that no individual user ...
What is an Operating System?
... Previous slide was very important (that's what allows modern OSes to work) ...
... Previous slide was very important (that's what allows modern OSes to work) ...
slides - Department of Computer Science
... handles of GNU chess some of the workusing gcc application ...
... handles of GNU chess some of the workusing gcc application ...
Lecture 3
... Why Only a Subset of Memory? • Why do we limit user-mode execution to a sub-set of memory? • What if a user mode process could access all of memory? – It could see or even potentially corrupt data belonging to other processes – It could even crash the operating system ...
... Why Only a Subset of Memory? • Why do we limit user-mode execution to a sub-set of memory? • What if a user mode process could access all of memory? – It could see or even potentially corrupt data belonging to other processes – It could even crash the operating system ...
An Overview of Fault Tolerance Techniques for Real
... some RTOSs disable MMU and don’t use it [9]. OSEK-VDX, µITRON and RTAI are examples of such RTOSs that disable MMU [11]. By disabling MMU the operating system and all processes are run in the same address space and each task has access to operating system’s and other processes’ codes and data. Hence ...
... some RTOSs disable MMU and don’t use it [9]. OSEK-VDX, µITRON and RTAI are examples of such RTOSs that disable MMU [11]. By disabling MMU the operating system and all processes are run in the same address space and each task has access to operating system’s and other processes’ codes and data. Hence ...
COS 318: Operating Systems I/O Device and Drivers
... System call code checks for correctness and buffer cache If it needs to perform I/O, it will issues a device driver call Device driver allocates a buffer for read and schedules I/O Initiate DMA read transfer Block the current process and schedule a ready process Device controller performs DMA read t ...
... System call code checks for correctness and buffer cache If it needs to perform I/O, it will issues a device driver call Device driver allocates a buffer for read and schedules I/O Initiate DMA read transfer Block the current process and schedule a ready process Device controller performs DMA read t ...
ppt
... 1. Normal kernel code is nonpreemptible (until 2.6) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is about to be returned to user mo ...
... 1. Normal kernel code is nonpreemptible (until 2.6) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is about to be returned to user mo ...
Chapter 1 (Part 2) Introduction to Operating System
... time constraints. Processing must be done within the defined constraints, or the system will fail. Real-Time systems may be either hard or soft realtime. Hard Real-Time Systems guarantee that critical tasks be completed on time. Soft Real-Time Systems prioritize critical tasks. That is, a crit ...
... time constraints. Processing must be done within the defined constraints, or the system will fail. Real-Time systems may be either hard or soft realtime. Hard Real-Time Systems guarantee that critical tasks be completed on time. Soft Real-Time Systems prioritize critical tasks. That is, a crit ...
ppt
... SPIN shows better network latency and bandwidth performance characteristics then OSF/1. The application code executes in the kernel, where it has low-latency access to both the device and data. ...
... SPIN shows better network latency and bandwidth performance characteristics then OSF/1. The application code executes in the kernel, where it has low-latency access to both the device and data. ...