2.4 The service and functions provided by an operating system can
... two main categories. Briefly describes the two categories and discuss how they differ. ANS: One class of services provided by an operating system is to enforce protection between different processes running concurrently in the system. Processes are allowed to access only those memory locations that ...
... two main categories. Briefly describes the two categories and discuss how they differ. ANS: One class of services provided by an operating system is to enforce protection between different processes running concurrently in the system. Processes are allowed to access only those memory locations that ...
UNIX Foundations - Computer Science
... device is available or assigned Status of I/O operation Location in main memory being used as the source or destination of the I/O transfer ...
... device is available or assigned Status of I/O operation Location in main memory being used as the source or destination of the I/O transfer ...
CS111—Operating System Principles
... ________________________________________________________________________ Suppose we have a simple machine. How do we get from the raw hardware to the point where an operating system is running the first process, or the process 1 under UNIX? Also, how are processes created in general? It’s a fascinat ...
... ________________________________________________________________________ Suppose we have a simple machine. How do we get from the raw hardware to the point where an operating system is running the first process, or the process 1 under UNIX? Also, how are processes created in general? It’s a fascinat ...
I. Course code and Title OPERATING SYSTEM CONCEPTS II
... This course covers the basic concepts of Operating Systems. It includes the following topics Overview: Operating System Role, Purpose and Functionality; Computing Environments: Single User, Multi User, Multiple Simultaneous Computations; Goals of Parallelism (e.g., Throughput) versus Concurrency (e. ...
... This course covers the basic concepts of Operating Systems. It includes the following topics Overview: Operating System Role, Purpose and Functionality; Computing Environments: Single User, Multi User, Multiple Simultaneous Computations; Goals of Parallelism (e.g., Throughput) versus Concurrency (e. ...
Two general strategies for creating multiple threads
... 1. When the stub is executed, it checks to see whether the needed routine is already in memory. 2. If it is not, the program loads the routine into memory. Either way, the stub replaces itself with the address of the routine and executes the routine. 3. Thus, the next time that particular code segme ...
... 1. When the stub is executed, it checks to see whether the needed routine is already in memory. 2. If it is not, the program loads the routine into memory. Either way, the stub replaces itself with the address of the routine and executes the routine. 3. Thus, the next time that particular code segme ...
Introduction to Operating Systems - Seneca
... It has become a standard on which many other operating systems are modelled We will be using a command-line interface to communicate with UNIX ...
... It has become a standard on which many other operating systems are modelled We will be using a command-line interface to communicate with UNIX ...
Lecture Overview Operating System Components
... • The virtual-machine concept provides complete protection of system resources since each virtual machine is isolated from all other virtual machines. This isolation, however, permits no direct sharing of resources. • A virtual-machine system is a perfect vehicle for operating-systems research and d ...
... • The virtual-machine concept provides complete protection of system resources since each virtual machine is isolated from all other virtual machines. This isolation, however, permits no direct sharing of resources. • A virtual-machine system is a perfect vehicle for operating-systems research and d ...
All of the above.
... • Spooling is commonly used to share one printer between different processes so that the output of each process does not interfere with the output of the other processes. • Spooling removed the need for small computers to do IO processing because the main computer could deal with slow IO devices wit ...
... • Spooling is commonly used to share one printer between different processes so that the output of each process does not interfere with the output of the other processes. • Spooling removed the need for small computers to do IO processing because the main computer could deal with slow IO devices wit ...
Course Title Operating Systems Course Code CUIT 109 Credits
... Individual Study hrs: 59 Assessment: 13 Notional Hours: 120 Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the nec ...
... Individual Study hrs: 59 Assessment: 13 Notional Hours: 120 Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the nec ...
OUTLINE - Bilkent University
... Windows File Systems • include FAT which is File Allocate Table. • File Allocate Table is a partially -patented file system -developed by Microsoft -for MS-DOS and versions of Microsoft Windows. • a cluster is the unit of disk space allocation for files and directories. • Fragmentation is a alloca ...
... Windows File Systems • include FAT which is File Allocate Table. • File Allocate Table is a partially -patented file system -developed by Microsoft -for MS-DOS and versions of Microsoft Windows. • a cluster is the unit of disk space allocation for files and directories. • Fragmentation is a alloca ...
2. Operating System Structure
... • send, receive messages • transfer status information • attach or detach remote devices ...
... • send, receive messages • transfer status information • attach or detach remote devices ...
Questions 1 Question 8.1–1: (Solution, p 3) Name at least two
... process. The operating system allocates resources (such as memory and file descriptors) to a process as a whole, and individual threads within that process share these resources. Thus, a process is a resource allocation unit with at least one thread, while a thread is an execution sequence working w ...
... process. The operating system allocates resources (such as memory and file descriptors) to a process as a whole, and individual threads within that process share these resources. Thus, a process is a resource allocation unit with at least one thread, while a thread is an execution sequence working w ...
Examination paper
... The English-Swedish dictionary should be available in the examination room. A calculator is allowed. Answers should be given preferably in English, but they are also acceptable in Swedish. Please, don’t use red ink. Good luck! ...
... The English-Swedish dictionary should be available in the examination room. A calculator is allowed. Answers should be given preferably in English, but they are also acceptable in Swedish. Please, don’t use red ink. Good luck! ...
Frequently Asked Questions - Operating System Concepts
... 33. What is a mission critical system ? 34. What is the important aspect of a real-time system ? 35. If two processes which shares same system memory and system clock in a distributed system, What is it called? 36. What is the state of the processor, when a process is waiting for some event to occur ...
... 33. What is a mission critical system ? 34. What is the important aspect of a real-time system ? 35. If two processes which shares same system memory and system clock in a distributed system, What is it called? 36. What is the state of the processor, when a process is waiting for some event to occur ...
Processes and System Calls
... • Multiprocessing (or multitasking) means having multiple processes existing at the same time • All processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process’ virtual memory is implemented using some of the available physical memory. The O ...
... • Multiprocessing (or multitasking) means having multiple processes existing at the same time • All processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process’ virtual memory is implemented using some of the available physical memory. The O ...
Processes and System Calls
... • Multiprocessing (or multitasking) means having multiple processes existing at the same time • All processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process’ virtual memory is implemented using some of the available physical memory. The O ...
... • Multiprocessing (or multitasking) means having multiple processes existing at the same time • All processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process’ virtual memory is implemented using some of the available physical memory. The O ...
Southeastern University
... –operating system software within context of a user process –process executes in privileged mode when executing operating system code Process-Based Operating System –major kernel functions are separate processes –Useful in multi-processor or multi-computer environment 10. What are the reasons for ...
... –operating system software within context of a user process –process executes in privileged mode when executing operating system code Process-Based Operating System –major kernel functions are separate processes –Useful in multi-processor or multi-computer environment 10. What are the reasons for ...
slides - Caltech
... • Each layer was basically reliable when next layer was being tested • Bugs tended to be very easy to identify and fix, just by inspection • This was good – they didn’t have any debugging facilities for the ...
... • Each layer was basically reliable when next layer was being tested • Bugs tended to be very easy to identify and fix, just by inspection • This was good – they didn’t have any debugging facilities for the ...
System Calls,Kernel Mode, and Process
... Ready queue – set of all processes ready for execution.! Device queues – set of processes waiting for an I/O device.! Process migration between the various queues. ...
... Ready queue – set of all processes ready for execution.! Device queues – set of processes waiting for an I/O device.! Process migration between the various queues. ...
Department of CSE
... 14. Describe the action taken by a kernel to context switch between processes? 15. Describe the difference among short-term, medium-term and long-term scheduling. 16. What are the differences between user level and kernel level threads? 17. Define the essential properties of the following types of O ...
... 14. Describe the action taken by a kernel to context switch between processes? 15. Describe the difference among short-term, medium-term and long-term scheduling. 16. What are the differences between user level and kernel level threads? 17. Define the essential properties of the following types of O ...
chapter 4
... illusion of several jobs executing simultaneously is created -Today, time-sharing is used in single-user systems as well as multi user systems, the former is called multitasking ...
... illusion of several jobs executing simultaneously is created -Today, time-sharing is used in single-user systems as well as multi user systems, the former is called multitasking ...
pptx
... The performance of a program or subsystem from one model, as reflected by its queue lengths, waiting times, service rates, etc. is identical to that of its dual system given identical scheduling strategies. The primitive operations provided by the operating system of one model can be made as effici ...
... The performance of a program or subsystem from one model, as reflected by its queue lengths, waiting times, service rates, etc. is identical to that of its dual system given identical scheduling strategies. The primitive operations provided by the operating system of one model can be made as effici ...
More Background* then some of the real stuff..
... special kernel function (normal user code can’t execute this instruction or call this kernel function – it isn’t a system call) While interrupts are disabled, hardware that needs service will be “waiting” and can hurt performance if used too often Notice the tension Disabling interrupts makes ...
... special kernel function (normal user code can’t execute this instruction or call this kernel function – it isn’t a system call) While interrupts are disabled, hardware that needs service will be “waiting” and can hurt performance if used too often Notice the tension Disabling interrupts makes ...
Process Management in xv6
... the same IRQ). The interrupt descriptor table (IDT) stores information on what to do for every interrupt number, and is setup during initialization (line 3317). The IDT entries for all interrupts point to a generic function to handle all traps (line 3254) that we will examine soon. • When an interru ...
... the same IRQ). The interrupt descriptor table (IDT) stores information on what to do for every interrupt number, and is setup during initialization (line 3317). The IDT entries for all interrupts point to a generic function to handle all traps (line 3254) that we will examine soon. • When an interru ...