Operating Systems
... Each device controller is in charge of a particular device type. Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by ...
... Each device controller is in charge of a particular device type. Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by ...
Powerpoint format - Computer and Information Sciences
... – Assign idle processors – New arrivals may be assigned to a processor that is used by a job currently using more than one processor – Hold request until processor is available – New arrivals will be given a processor before existing running applications ...
... – Assign idle processors – New arrivals may be assigned to a processor that is used by a job currently using more than one processor – Hold request until processor is available – New arrivals will be given a processor before existing running applications ...
os3-2_pro
... • It prevents a single process from monopolizing processor time. • It decides who goes next according to a scheduling algorithm. • The CPU will always execute instructions from the dispatcher while switching from process A to process B. ...
... • It prevents a single process from monopolizing processor time. • It decides who goes next according to a scheduling algorithm. • The CPU will always execute instructions from the dispatcher while switching from process A to process B. ...
Operating System Concepts for System Programmers
... classify the programmers into System Programmers and Applications programmers. System programmers directly deal with the services (system calls) provided by the OS. Where as application programmers use the APIs (Application Programming Interface functions) provided by the application environments su ...
... classify the programmers into System Programmers and Applications programmers. System programmers directly deal with the services (system calls) provided by the OS. Where as application programmers use the APIs (Application Programming Interface functions) provided by the application environments su ...
Network Operating Systems - Partha Dasgupta`s Workstation!
... Network Operating Systems extend the facilities and services provided by computer operating systems to support a set of computers, connected by a network. The environment managed by a network operating system consists of an interconnected group of machines that are loosely connected. By loosely conn ...
... Network Operating Systems extend the facilities and services provided by computer operating systems to support a set of computers, connected by a network. The environment managed by a network operating system consists of an interconnected group of machines that are loosely connected. By loosely conn ...
Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... A programming language construct that encapsulates variables, access procedures and initialization code within an abstract data type. The monitor's variable may only be accessed via its access procedures and only one process may be actively accessing the monitor at any one time. The access procedure ...
... A programming language construct that encapsulates variables, access procedures and initialization code within an abstract data type. The monitor's variable may only be accessed via its access procedures and only one process may be actively accessing the monitor at any one time. The access procedure ...
J0282 / Pengantar Teknologi Informasi
... Controls how you enter data and instructions and how information displays on screen ...
... Controls how you enter data and instructions and how information displays on screen ...
Chapter One
... Most shells provide basic command-line editing capabilities and keep a history of your most recently used commands You can view the contents of files with view commands such as cat, less, more, head, and tails ...
... Most shells provide basic command-line editing capabilities and keep a history of your most recently used commands You can view the contents of files with view commands such as cat, less, more, head, and tails ...
No Slide Title
... The process has a virtual memory address space, information (such as a base priority), and an affinity for one or more processors. Threads are the unit of execution scheduled by the kernel’s dispatcher. Each thread has its own state, including a priority, processor affinity, and accounting informati ...
... The process has a virtual memory address space, information (such as a base priority), and an affinity for one or more processors. Threads are the unit of execution scheduled by the kernel’s dispatcher. Each thread has its own state, including a priority, processor affinity, and accounting informati ...
unixhist
... Even though Multics could not then support many users, it could support us, albeit at exorbitant cost. We didn't want to lose the pleasant niche we occupied, because no similar ones were available; even the timesharing service that would later be offered under GE's operating system did not exist. Wh ...
... Even though Multics could not then support many users, it could support us, albeit at exorbitant cost. We didn't want to lose the pleasant niche we occupied, because no similar ones were available; even the timesharing service that would later be offered under GE's operating system did not exist. Wh ...
Operating Systems – OS Architecture Models
... to its logical conclusion. Hardware is simulated in software; all resources are virtualized; individual OS run on virtualized resources • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executin ...
... to its logical conclusion. Hardware is simulated in software; all resources are virtualized; individual OS run on virtualized resources • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executin ...
System Management
... • Operating system’s strengths and weaknesses need to be weighed in relation to: • Users of the OS • Hardware on which the OS will run ...
... • Operating system’s strengths and weaknesses need to be weighed in relation to: • Users of the OS • Hardware on which the OS will run ...
History of Unix OS - Seneca
... that more person to directly communicate with the computer. Although the OS can only work on one task at a time, a small piece of time (time slice) is dedicated to each task or user - this is referred to as “time-sharing”. Time sharing gives the illusion that the CPU is giving all the users its full ...
... that more person to directly communicate with the computer. Although the OS can only work on one task at a time, a small piece of time (time slice) is dedicated to each task or user - this is referred to as “time-sharing”. Time sharing gives the illusion that the CPU is giving all the users its full ...
ppt
... Function like sin(x), cos(x) are not system calls. Some functions like printf(s) run mainly in user mode but eventually call write() when for example the buffer is full and needs to be flushed. Also malloc(size) will run mostly in user mode but when current heap is not large enough, it will call sbr ...
... Function like sin(x), cos(x) are not system calls. Some functions like printf(s) run mainly in user mode but eventually call write() when for example the buffer is full and needs to be flushed. Also malloc(size) will run mostly in user mode but when current heap is not large enough, it will call sbr ...
Xiuxian Chen
... It is relatively simple to ensure that the former property holds. For example, we can disallow process again on real-time processes, thereby guaranteeing that the priority of the various processes does not change. However, ensuring the latter property is much more involved. The problem is that many ...
... It is relatively simple to ensure that the former property holds. For example, we can disallow process again on real-time processes, thereby guaranteeing that the priority of the various processes does not change. However, ensuring the latter property is much more involved. The problem is that many ...
Lecture 3 Processes and Communication
... notice anything wrong BUT process B will never receive any output, – User B will hang around the printer room wistfully hoping for output that never comes. ...
... notice anything wrong BUT process B will never receive any output, – User B will hang around the printer room wistfully hoping for output that never comes. ...
Operating Systems
... • Your home directory is where you are located when you log in (e.g., /afs/umbc.edu/users/j/d/jdoe28). • The current directory is where you are located at any time while you are using the system. • Files within the same directory must be given unique names. • Paths allow us to give the same name to ...
... • Your home directory is where you are located when you log in (e.g., /afs/umbc.edu/users/j/d/jdoe28). • The current directory is where you are located at any time while you are using the system. • Files within the same directory must be given unique names. • Paths allow us to give the same name to ...
ing systems were being developed in the
... Memory protection. In the multiserver design of MINIX 3, all servers and drivers of the operating system run as isolated user-mode processes. Each is encapsulated in a private address space that is protected by the MMU hardware. An illegal access attempt to another process’s memory raises an MMU exc ...
... Memory protection. In the multiserver design of MINIX 3, all servers and drivers of the operating system run as isolated user-mode processes. Each is encapsulated in a private address space that is protected by the MMU hardware. An illegal access attempt to another process’s memory raises an MMU exc ...
INF5070 – Media Storage and Distribution Systems
... requests for all tasks with deadlines are periodic the deadline of a task is equal to the end on its period (starting of next) independent tasks (no precedence) run-time for each task is known and constant context switches can be ignored any non-periodic task has no deadline INF5070 – me ...
... requests for all tasks with deadlines are periodic the deadline of a task is equal to the end on its period (starting of next) independent tasks (no precedence) run-time for each task is known and constant context switches can be ignored any non-periodic task has no deadline INF5070 – me ...
MODERN OPERATING SYSTEMS Third Edition ANDREW S
... Threads not independent, within a Heavy-Weight Process (HWP) The RAM address space is shared; No memory protection from each other The stacks of each thread are intended to be in separate RAM, but if one thread has a problem (e.g., with pointers or array addressing), it could write over the stack of ...
... Threads not independent, within a Heavy-Weight Process (HWP) The RAM address space is shared; No memory protection from each other The stacks of each thread are intended to be in separate RAM, but if one thread has a problem (e.g., with pointers or array addressing), it could write over the stack of ...
Signals, Semaphores and Deadlock
... 1. The resources involved cannot be shared; only one process at a time can use a particular resource. 2. No preemption – once a resource has been allocated to a process, that resource cannot be preempted by another process. Processes hold on to the resources they have been allocated until they relea ...
... 1. The resources involved cannot be shared; only one process at a time can use a particular resource. 2. No preemption – once a resource has been allocated to a process, that resource cannot be preempted by another process. Processes hold on to the resources they have been allocated until they relea ...
File Systems
... ∗ free space that is not marked as free • journaling (e.g., Veritas, NTFS, Linux ext3) – record file system meta-data changes in a journal (log), so that sequences of changes can be written to disk in a single operation – after changes have been journaled, update the disk data structures ...
... ∗ free space that is not marked as free • journaling (e.g., Veritas, NTFS, Linux ext3) – record file system meta-data changes in a journal (log), so that sequences of changes can be written to disk in a single operation – after changes have been journaled, update the disk data structures ...
Distributed Operating Systems
... processes are running concurrently and sharing resources. Synchronization related issues Clock synchronization/Event Ordering (recall happened before relation) Mutual exclusion Deadlocks Election Algorithms ...
... processes are running concurrently and sharing resources. Synchronization related issues Clock synchronization/Event Ordering (recall happened before relation) Mutual exclusion Deadlocks Election Algorithms ...
Ceng 334 - Operating Systems
... • The scheduler allocates time based on execution priority, taking into account factors such as whether the thread belongs to a foreground or background process and how long it has been since the thread was last run • Win32 and DOS apps are preemptively multitasked. • Win16 apps are cooperatively mu ...
... • The scheduler allocates time based on execution priority, taking into account factors such as whether the thread belongs to a foreground or background process and how long it has been since the thread was last run • Win32 and DOS apps are preemptively multitasked. • Win16 apps are cooperatively mu ...