2015 test - Department of Computer Science
... (a) The algorithm uses the scheduling priority of each process as its unique ordering identifier. (b) The process id of the process is appended to the ticket number distributed by the algorithm and this is a unique ordering identifier. (c) The ticket number distributed by the algorithm is appended t ...
... (a) The algorithm uses the scheduling priority of each process as its unique ordering identifier. (b) The process id of the process is appended to the ticket number distributed by the algorithm and this is a unique ordering identifier. (c) The ticket number distributed by the algorithm is appended t ...
Terminal Control - Utah Valley University
... What if this program was running in an atm machine, and the person walked away without typing ‘y’ or ‘n’? Someone else could walk up and run a transaction using this person’s account. ...
... What if this program was running in an atm machine, and the person walked away without typing ‘y’ or ‘n’? Someone else could walk up and run a transaction using this person’s account. ...
Module 4: Processes
... Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
... Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
Review
... An Operating System (OS) provides a virtual machine on top of the real hardware, whose interface is more convenient than the raw hardware interface. ...
... An Operating System (OS) provides a virtual machine on top of the real hardware, whose interface is more convenient than the raw hardware interface. ...
Operating Systems Principles Lecture 1: Introduction
... Transistors and Batch Systems Memory Layout of a Batch System ...
... Transistors and Batch Systems Memory Layout of a Batch System ...
pdf
... A user-level thread is managed entirely by the run-time system (user-level code that is linked with your program). Each thread is represented simply by a PC, registers, stack and a little control block, managed in the user’s address space. Creating a new thread, switching between threads, and synchr ...
... A user-level thread is managed entirely by the run-time system (user-level code that is linked with your program). Each thread is represented simply by a PC, registers, stack and a little control block, managed in the user’s address space. Creating a new thread, switching between threads, and synchr ...
4 Operating System Activities
... An operating system is a type of system software that acts as the master controller for all activities that take place within a computer system ...
... An operating system is a type of system software that acts as the master controller for all activities that take place within a computer system ...
Presentazione di PowerPoint - Micrel Lab @ DEIS
... OS installs desired activation record as current CPU state. ...
... OS installs desired activation record as current CPU state. ...
William Stallings Computer Organization and Architecture
... • 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 ...
... • 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 ...
PPT
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
Chorusamoeba
... Objectives: to the user system should look like a single computer The computing power is located in a processor pool containing a number of CPU’s , each with its own local memory and its own network connection. There are a couple of workstations through which users access the system-for e.g. X-termi ...
... Objectives: to the user system should look like a single computer The computing power is located in a processor pool containing a number of CPU’s , each with its own local memory and its own network connection. There are a couple of workstations through which users access the system-for e.g. X-termi ...
William Stallings Computer Organization and Architecture
... • 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 ...
... • 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 ...
Building an eGovernment Knowledge Platform
... ▪ load jobs into memory from tapes, card reading and line printing are done offline. ...
... ▪ load jobs into memory from tapes, card reading and line printing are done offline. ...
Module 3: Operating
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation –programs need to read and write files and directories, create and delete them, search them, list file Information, permission management ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation –programs need to read and write files and directories, create and delete them, search them, list file Information, permission management ...
Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... Hardware Mutual Exclusion: Disadvantages • Busy-waiting consumes processor time • Starvation is possible when a process leaves a critical section and more than one process is waiting – Some process could indefinitely be denied access because selection of a waiting process is arbitrary ...
... Hardware Mutual Exclusion: Disadvantages • Busy-waiting consumes processor time • Starvation is possible when a process leaves a critical section and more than one process is waiting – Some process could indefinitely be denied access because selection of a waiting process is arbitrary ...
CITS2002 Systems Programming An Introduction to Operating
... As multi-tasking operating systems emerged, accountability of resource use became necessary, and operating system monitors oversaw the execution of programs. As with modern operating systems, there was the need to: protect the operating system from the program, protect programs from themselves, prot ...
... As multi-tasking operating systems emerged, accountability of resource use became necessary, and operating system monitors oversaw the execution of programs. As with modern operating systems, there was the need to: protect the operating system from the program, protect programs from themselves, prot ...
Computer Network and Infrastructure
... Quantitative Measurable such as response time and throughput Not performance related Qualitative Predictability Table 9.2 Note that all criteria in table 9.2 are inter dependent. For example providing good response time may mean frequent task switching, this increases the over head to the sy ...
... Quantitative Measurable such as response time and throughput Not performance related Qualitative Predictability Table 9.2 Note that all criteria in table 9.2 are inter dependent. For example providing good response time may mean frequent task switching, this increases the over head to the sy ...
Stallings - Chapter 11
... May be differences of several orders of magnitude between the data transfer rates ...
... May be differences of several orders of magnitude between the data transfer rates ...
Operating Systems
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
08_Operating System Support
... • Determines which programs are submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
... • Determines which programs are submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
Multi-processor and Real
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...