Windows_NT_4
... NT’s operating system environments are implemented as client/server systems. The operating system environment is implemented as the server and applications make requests to the server using the API exported by the client-side libraries linked to the application during compilation. Applications writt ...
... NT’s operating system environments are implemented as client/server systems. The operating system environment is implemented as the server and applications make requests to the server using the API exported by the client-side libraries linked to the application during compilation. Applications writt ...
5. Process and thread scheduling
... 5.2 Scheduling Methods – A Framework for Scheduling – Common Scheduling Algorithms – Comparison of Methods ...
... 5.2 Scheduling Methods – A Framework for Scheduling – Common Scheduling Algorithms – Comparison of Methods ...
Operating Systems for Parallel Processing - Current Activities
... Processes can be found in all operating systems (multiprogramming, multitasking, parallel and distributed). When using a RUN command on an executable file, a process is created by the operating system. The process will receive a process ID – a unique number that will identify the process in the sys ...
... Processes can be found in all operating systems (multiprogramming, multitasking, parallel and distributed). When using a RUN command on an executable file, a process is created by the operating system. The process will receive a process ID – a unique number that will identify the process in the sys ...
Spooling
... Providing mechanism for process synchronization (serially execution of the program one after ...
... Providing mechanism for process synchronization (serially execution of the program one after ...
Lecture 5
... Platform-independence is not practical. • In a system without an OS, such as a microcontroller used with a small embedded system, we either use Assembly or very low level C code. I/O often involves addressing specific bits in memory that are mapped to particular input or output devices. ...
... Platform-independence is not practical. • In a system without an OS, such as a microcontroller used with a small embedded system, we either use Assembly or very low level C code. I/O often involves addressing specific bits in memory that are mapped to particular input or output devices. ...
Operating Systems Sample Exam Questions and Answers Tommy Sailing
... 11. Name some advantages and disadvantages of user-level threads. Advantages of user-level threads include: - Theoretically greater performance, as the OS does not need to perform expensive context switches every time a thread changes. - More configurable, as you are not tied to the kernel to decid ...
... 11. Name some advantages and disadvantages of user-level threads. Advantages of user-level threads include: - Theoretically greater performance, as the OS does not need to perform expensive context switches every time a thread changes. - More configurable, as you are not tied to the kernel to decid ...
William Stallings Computer Organization and Architecture
... • Simplifies handling of growing data structures • Allows programs to be altered and recompiled independently, without re-linking and re-loading • Lends itself to sharing among processes • Lends itself to protection • Some systems combine segmentation with ...
... • Simplifies handling of growing data structures • Allows programs to be altered and recompiled independently, without re-linking and re-loading • Lends itself to sharing among processes • Lends itself to protection • Some systems combine segmentation with ...
introduction to operating system
... Spooling( a future of third generation) Operating system reads jobs from cards onto disk instead of reading directly into memory (reading is time consuming so during reading some other jobs are also performed). Whenever a running job finished the operating system load a new job from the disk int ...
... Spooling( a future of third generation) Operating system reads jobs from cards onto disk instead of reading directly into memory (reading is time consuming so during reading some other jobs are also performed). Whenever a running job finished the operating system load a new job from the disk int ...
Multiple Processor Systems
... Multiprocessor Synchronization • The CPUs in a multiprocessor frequently need to synchronize. We just saw the case in which kernel critical regions and tables have to be protected by mutexes. • To start with, proper synchronization primitives are really needed. If a process on a uniprocessor machin ...
... Multiprocessor Synchronization • The CPUs in a multiprocessor frequently need to synchronize. We just saw the case in which kernel critical regions and tables have to be protected by mutexes. • To start with, proper synchronization primitives are really needed. If a process on a uniprocessor machin ...
CSC221 COMPUTER ORGANZIATION AND ASSEMBLY LANGUAGE
... What is an Operating System? • A program that acts as an intermediary between a user of a computer and the computer hardware.` • An operating system is a software that manages the computer hardware and provides basis for application programs. • The main goals of operating system are: • Execute user ...
... What is an Operating System? • A program that acts as an intermediary between a user of a computer and the computer hardware.` • An operating system is a software that manages the computer hardware and provides basis for application programs. • The main goals of operating system are: • Execute user ...
Why Study OS?
... u Hardware protects from one another (mem protection) u Computer reads jobs from cards as jobs finish (spooling) u Still batch systems: can’t debug online u Solution: time-sharing u ...
... u Hardware protects from one another (mem protection) u Computer reads jobs from cards as jobs finish (spooling) u Still batch systems: can’t debug online u Solution: time-sharing u ...
Process State
... Batch system – jobs Time-shared systems – user programs or tasks Textbook uses the terms job and process almost interchangeably Process – a program in execution; process execution must progress in sequential fashion A process includes: program counter stack data section ...
... Batch system – jobs Time-shared systems – user programs or tasks Textbook uses the terms job and process almost interchangeably Process – a program in execution; process execution must progress in sequential fashion A process includes: program counter stack data section ...
ppt - SERC
... Producer writes at one end (write-end) and consumer reads from the other end (read-end) corresponds to 2 file descriptors (int fd[2]) Read from fd[0] accesses data written to fd[1] in FIFO order and vice versa Used with fork - parent process creates a pipe and uses it to communicate with a child pro ...
... Producer writes at one end (write-end) and consumer reads from the other end (read-end) corresponds to 2 file descriptors (int fd[2]) Read from fd[0] accesses data written to fd[1] in FIFO order and vice versa Used with fork - parent process creates a pipe and uses it to communicate with a child pro ...
cs320ch3powerpoint
... policy driven: Interrupts force a change in what job is running • Aside from handling interrupts as they occur, it is O/S policy, the scheduling algorithm, that determines what job is scheduled • The O/S maintains data structures, including PCB’s, which define current scheduling state • There are pr ...
... policy driven: Interrupts force a change in what job is running • Aside from handling interrupts as they occur, it is O/S policy, the scheduling algorithm, that determines what job is scheduled • The O/S maintains data structures, including PCB’s, which define current scheduling state • There are pr ...
lecture31-dec11
... • Claim edge converts to request edge when a process requests a resource. • Request edge converted to an assignment edge when the resource is allocated to the process. • When a resource is released by a process, assignment edge reconverts to a claim edge. • Resources must be claimed a priori in the ...
... • Claim edge converts to request edge when a process requests a resource. • Request edge converted to an assignment edge when the resource is allocated to the process. • When a resource is released by a process, assignment edge reconverts to a claim edge. • Resources must be claimed a priori in the ...
PPTX - Duke Computer Science
... With the TLB turned on and a single system-wide address space with 4KB pages, WebFiles experiences an immediate 6.3% slowdown. Moving the client SIP to a separate protection domain (still in ring 0) increases the slowdown to 18.9%. Moving the client SIP to ring 3 increases the slowdown to 33%. Fina ...
... With the TLB turned on and a single system-wide address space with 4KB pages, WebFiles experiences an immediate 6.3% slowdown. Moving the client SIP to a separate protection domain (still in ring 0) increases the slowdown to 18.9%. Moving the client SIP to ring 3 increases the slowdown to 33%. Fina ...
Operating Systems
... indicate the current mode: monitor (0) or user (1). • When an interrupt or fault occurs hardware switches to monitor mode. ...
... indicate the current mode: monitor (0) or user (1). • When an interrupt or fault occurs hardware switches to monitor mode. ...
AutoPod: Unscheduled System Updates with Zero Data Loss
... The AutoPod model is based on a virtual machine abstraction called a pod (PrOcess Domain). Pods were previously introduced in Zap [2] to support migration assuming the same operating system version is used for all systems. AutoPod extends this work to enable pods to provide a complete secure virtual ...
... The AutoPod model is based on a virtual machine abstraction called a pod (PrOcess Domain). Pods were previously introduced in Zap [2] to support migration assuming the same operating system version is used for all systems. AutoPod extends this work to enable pods to provide a complete secure virtual ...
slides - Embedded System and Wireless Networking Lab National
... of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users. ...
... of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users. ...
OPERATING SYSTEMS
... file; and semi-private files allows some users with the correct password access to files. User also specifies if others can or cannot modify, erase these accessible files. Hence the OS keeps “directories of information about the location and characteristics of files stored on a computer’s secondary ...
... file; and semi-private files allows some users with the correct password access to files. User also specifies if others can or cannot modify, erase these accessible files. Hence the OS keeps “directories of information about the location and characteristics of files stored on a computer’s secondary ...
Document
... they are big and obvious. It's not just that the solutions are simple, they are simple and right under our noses. It's not just that hardware is more advanced than software; the last big operating-systems breakthrough was the Macintosh, sixteen years ago, and today's hottest item is Linux, which is ...
... they are big and obvious. It's not just that the solutions are simple, they are simple and right under our noses. It's not just that hardware is more advanced than software; the last big operating-systems breakthrough was the Macintosh, sixteen years ago, and today's hottest item is Linux, which is ...