P - Bilkent University Computer Engineering Department
... No Preemption – – A processing holding resources make requests: if request cannot be granted, release (preempt) the held resources, and try again later. – Preempted resources are added to the list of resources for which the process is waiting – Process will be restarted only when it can regain its o ...
... No Preemption – – A processing holding resources make requests: if request cannot be granted, release (preempt) the held resources, and try again later. – Preempted resources are added to the list of resources for which the process is waiting – Process will be restarted only when it can regain its o ...
PPT
... Compare R1 with A! R1 is not smaller or equal to A. So it can not be satisfied. Compare R2 with A! R2 is not smaller or equal to A. So it can not be satisfied. Compare R3 with A! R3 is smaller or equal to A. So it can be satisfied. Release resource of process 3. A = A + C3, A = (2, 2, 2, 0) Mark pro ...
... Compare R1 with A! R1 is not smaller or equal to A. So it can not be satisfied. Compare R2 with A! R2 is not smaller or equal to A. So it can not be satisfied. Compare R3 with A! R3 is smaller or equal to A. So it can be satisfied. Release resource of process 3. A = A + C3, A = (2, 2, 2, 0) Mark pro ...
CS 350 Operating Systems Course Notes
... • multiprogramming means having multiple processes existing at the same time • most modern, general purpose operating systems support multiprogramming • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the availab ...
... • multiprogramming means having multiple processes existing at the same time • most modern, general purpose operating systems support multiprogramming • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the availab ...
VirtuOS: an operating system with kernel virtualization
... Our design goal is to contain faults originating in service domains only; we assume that the primary domain is stable enough to perform core system tasks such as task scheduling, IPC, and memory management. Service domains execute code that is potentially less reliable, such as drivers and correspon ...
... Our design goal is to contain faults originating in service domains only; we assume that the primary domain is stable enough to perform core system tasks such as task scheduling, IPC, and memory management. Service domains execute code that is potentially less reliable, such as drivers and correspon ...
Running Commodity Operating Systems on Scalable Multiprocessors
... FIGURE 1. Architecture of Disco: Disco is a virtual machine monitor, a software layer between the hardware and multiple virtual machines that run independent operating systems. This allows multiple copies of a commodity operating system to coexist with specialized “thin” operating systems on the sam ...
... FIGURE 1. Architecture of Disco: Disco is a virtual machine monitor, a software layer between the hardware and multiple virtual machines that run independent operating systems. This allows multiple copies of a commodity operating system to coexist with specialized “thin” operating systems on the sam ...
1 Introduction 2 Problem Description Disco: Running Commodity
... FIGURE 1. Architecture of Disco: Disco is a virtual machine monitor, a software layer between the hardware and multiple virtual machines that run independent operating systems. This allows multiple copies of a commodity operating system to coexist with specialized “thin” operating systems on the sam ...
... FIGURE 1. Architecture of Disco: Disco is a virtual machine monitor, a software layer between the hardware and multiple virtual machines that run independent operating systems. This allows multiple copies of a commodity operating system to coexist with specialized “thin” operating systems on the sam ...
Disco: Running Commodity Operating Systems on Scalable Multiprocessors
... only the monitor itself and the distributed systems protocols need to scale to the size of the machine. The simplicity of the monitor makes this task easier than building a scalable operating system. The virtual machine also becomes the unit of fault containment where failures in the system software ...
... only the monitor itself and the distributed systems protocols need to scale to the size of the machine. The simplicity of the monitor makes this task easier than building a scalable operating system. The virtual machine also becomes the unit of fault containment where failures in the system software ...
Course ”Operating System Security”
... Computer Security: Technology Major technological advances in computers raises new security threats that require new security solutions (e.g., Trusted Computing) New technologies should be accompanied by integrated security strategies! There has long been the perception that true computer security c ...
... Computer Security: Technology Major technological advances in computers raises new security threats that require new security solutions (e.g., Trusted Computing) New technologies should be accompanied by integrated security strategies! There has long been the perception that true computer security c ...
Module 4: Processes
... Long-term scheduler is invoked very infrequently (seconds, minutes) (may be slow) The long-term scheduler controls the degree of multiprogramming ...
... Long-term scheduler is invoked very infrequently (seconds, minutes) (may be slow) The long-term scheduler controls the degree of multiprogramming ...
Notes by Guydosh on Thread managment
... 5) may seem confusing when discussing the difference between user threads and kernel threads. In looking at this distinction, we must distinguish between the location of these threads (user space vs. kernel space), and the management or control (user managed vs. kernel managed) of these threads. Sta ...
... 5) may seem confusing when discussing the difference between user threads and kernel threads. In looking at this distinction, we must distinguish between the location of these threads (user space vs. kernel space), and the management or control (user managed vs. kernel managed) of these threads. Sta ...
EMERALDS-OSEK: A Small Real-Time Operating System for
... from the previously-active stack to this stack so it can be used by the interrupt service routines (ISRs). Without the interrupt stack, the ISRs would use the stack of whatever task was running at the time the interrupt occurred. This means that the stack for every task will have to be b bytes large ...
... from the previously-active stack to this stack so it can be used by the interrupt service routines (ISRs). Without the interrupt stack, the ISRs would use the stack of whatever task was running at the time the interrupt occurred. This means that the stack for every task will have to be b bytes large ...
Multiuser Systems
... Each computer system includes a basic set of programs called the operating system. The most important program in the set is called the kernel. It is loaded into RAM when the system boots and contains many critical procedures that are needed for the system to operate. The other programs are less cruc ...
... Each computer system includes a basic set of programs called the operating system. The most important program in the set is called the kernel. It is loaded into RAM when the system boots and contains many critical procedures that are needed for the system to operate. The other programs are less cruc ...
thread
... • Communication between processes. We don’t need special setups for shared memory when implementing communicating processes as threads in the same task. • Redundancy avoidance. If you need several versions of one program reading the same data at the same time, it’s inefficient to have each version i ...
... • Communication between processes. We don’t need special setups for shared memory when implementing communicating processes as threads in the same task. • Redundancy avoidance. If you need several versions of one program reading the same data at the same time, it’s inefficient to have each version i ...
Processes - EECG Toronto
... How does the OS represent a process in the kernel? • At any time, there are many processes in the system, each in its particular state • The OS data structure representing each process is called the Process Control Block (PCB) • The PCB contains all of the info about a process • The PCB also is wher ...
... How does the OS represent a process in the kernel? • At any time, there are many processes in the system, each in its particular state • The OS data structure representing each process is called the Process Control Block (PCB) • The PCB contains all of the info about a process • The PCB also is wher ...
Module 7: Process Synchronization
... Background Concurrent access to shared data may result in data ...
... Background Concurrent access to shared data may result in data ...
Introduction to Linux
... ■ sh (Bourne Shell) The sh shell was the earliest shell, being developed for UNIX back in the late 1970s. ■ bash (Bourne-Again Shell) The bash shell is an improved version of the sh shell and is one of the most popular shells today. It’s the default shell used by most Linux distributions. ■ csh (C S ...
... ■ sh (Bourne Shell) The sh shell was the earliest shell, being developed for UNIX back in the late 1970s. ■ bash (Bourne-Again Shell) The bash shell is an improved version of the sh shell and is one of the most popular shells today. It’s the default shell used by most Linux distributions. ■ csh (C S ...
ch8
... 10. Correct the page table and other tables to show page is now in memory 11. Wait for the CPU to be allocated to this process again 12. Restore the user registers, process state, and new page table, and then resume the ...
... 10. Correct the page table and other tables to show page is now in memory 11. Wait for the CPU to be allocated to this process again 12. Restore the user registers, process state, and new page table, and then resume the ...
Chapter 4: Threads
... threads share resources of process, easier than shared-memory or messagepassing. Since programmer need not explicitly code for communication between threads (shared-memory or message-passing codes, in Chap-3) ...
... threads share resources of process, easier than shared-memory or messagepassing. Since programmer need not explicitly code for communication between threads (shared-memory or message-passing codes, in Chap-3) ...
Chapter 9 - cse.sc.edu
... Each program takes less memory while running -> more programs run at the same time ...
... Each program takes less memory while running -> more programs run at the same time ...