Document
... Real time in system (r) Total service time (t) Period (d) Deadline (explicit or implied by period) External priority (e) Memory requirements (mostly for batch) System load (not process-specific) ...
... Real time in system (r) Total service time (t) Period (d) Deadline (explicit or implied by period) External priority (e) Memory requirements (mostly for batch) System load (not process-specific) ...
No Slide Title
... when the number of kernel semaphore types used is high. In this case, it may be quite difficult to ensure that no deadlock state will ever be reached for all possible ways to interleave kernel control paths. Several operating systems, including Linux, avoid this problem by introducing a very limited ...
... when the number of kernel semaphore types used is high. In this case, it may be quite difficult to ensure that no deadlock state will ever be reached for all possible ways to interleave kernel control paths. Several operating systems, including Linux, avoid this problem by introducing a very limited ...
Time-outs using Linux
... decrements both when the process executes and when the system is executing on behalf of the process. Coupled with ITIMER_VIR TUAL, this timer is usually used to profile the time spent by the application in user and kernel space. SIGPROF is delivered upon expiration. ...
... decrements both when the process executes and when the system is executing on behalf of the process. Coupled with ITIMER_VIR TUAL, this timer is usually used to profile the time spent by the application in user and kernel space. SIGPROF is delivered upon expiration. ...
Interrupts and Exceptions
... has completed an operation or has encountered an error Data must be transferred between memory and an I/O device ...
... has completed an operation or has encountered an error Data must be transferred between memory and an I/O device ...
CS-3013 Week 0:- Introduction
... security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: ...
... security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: ...
Chapter 4
... • Process Control Block (PCB) components – Process state: • Contains all of the information needed to indicate the current state of the job: – Process Status Word – The current instruction counter and register contents when the job isn’t running but is either on HOLD or is READY or WAITING. If the j ...
... • Process Control Block (PCB) components – Process state: • Contains all of the information needed to indicate the current state of the job: – Process Status Word – The current instruction counter and register contents when the job isn’t running but is either on HOLD or is READY or WAITING. If the j ...
File System - dhdurso.org index to available resources
... A process is a program in execution. Processes are identified by their process identifier, an integer. Process control system calls – fork creates a new process – execve is used after a fork to replace on of the two processes’s virtual memory space with a new program – exit terminates a process – A ...
... A process is a program in execution. Processes are identified by their process identifier, an integer. Process control system calls – fork creates a new process – execve is used after a fork to replace on of the two processes’s virtual memory space with a new program – exit terminates a process – A ...
Ceng 334 - Operating Systems
... • OS services only accessed via system calls • Users and programs can’t directly access the hardware Set of System Calls (APIs) is what programs think the operating system is. Ceng 334 - Operating Systems ...
... • OS services only accessed via system calls • Users and programs can’t directly access the hardware Set of System Calls (APIs) is what programs think the operating system is. Ceng 334 - Operating Systems ...
2. Operating System Case Study: Linux
... For a multitask system, system multiple programs can be executed simultaneously in the system When a program starts to execute, it becomes a process The same program executing at two different times will become two different processes Kernel manages processes in terms of creating, suspending, and te ...
... For a multitask system, system multiple programs can be executed simultaneously in the system When a program starts to execute, it becomes a process The same program executing at two different times will become two different processes Kernel manages processes in terms of creating, suspending, and te ...
lecture 6 - Philadelphia University
... security requirements are executed at different times • Logical Separation, in which users operate under the illusion that no other processes exist, as when an operating system constrains a program’s access so that it cannot access objects outside its permitted domain • Cryptographic Separation, in ...
... security requirements are executed at different times • Logical Separation, in which users operate under the illusion that no other processes exist, as when an operating system constrains a program’s access so that it cannot access objects outside its permitted domain • Cryptographic Separation, in ...
Operating-System Structures
... Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block p ...
... Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block p ...
What is an Operating System?
... When it has to wait (for I/O for example), OS switches to another job ...
... When it has to wait (for I/O for example), OS switches to another job ...
Commercial Real-Time Operating Systems
... file systems, sockets, and so on. With full configuration, it can function as a multipurpose Unix machine on which both hard and soft real-time tasks can run. Unlike many embedded real-time operating systems, Lynx supports memory protection. ...
... file systems, sockets, and so on. With full configuration, it can function as a multipurpose Unix machine on which both hard and soft real-time tasks can run. Unlike many embedded real-time operating systems, Lynx supports memory protection. ...
unixhist
... processor; the whole system was used as a Graphic-II terminal. He and I rewrote Space Travel to run on this machine. The undertaking was more ambitious than it might seem; because we disdained all existing software, we had to write a floating-point arithmetic package, the pointwise specification of ...
... processor; the whole system was used as a Graphic-II terminal. He and I rewrote Space Travel to run on this machine. The undertaking was more ambitious than it might seem; because we disdained all existing software, we had to write a floating-point arithmetic package, the pointwise specification of ...
Scheduling
... Surplus Fair Scheduling: A Proportional-Share CPU Scheduling Algorithm for Symmetric Multiprocessors Scheduler Activations: Effective Kernel Support for UserLevel Management of Parallelism", Condor- A Hunter of Idle Workstation Virtual-Time Round-Robin: An O(1) Proportional Share ...
... Surplus Fair Scheduling: A Proportional-Share CPU Scheduling Algorithm for Symmetric Multiprocessors Scheduler Activations: Effective Kernel Support for UserLevel Management of Parallelism", Condor- A Hunter of Idle Workstation Virtual-Time Round-Robin: An O(1) Proportional Share ...
ppt
... a few. A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit but do have one to move a byte. A less common term is word, which is a given computer architecture’s native unit of data. A word is made ...
... a few. A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit but do have one to move a byte. A less common term is word, which is a given computer architecture’s native unit of data. A word is made ...
ch1 - Towson University
... a few. A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit but do have one to move a byte. A less common term is word, which is a given computer architecture’s native unit of data. A word is made ...
... a few. A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit but do have one to move a byte. A less common term is word, which is a given computer architecture’s native unit of data. A word is made ...
Visualizing the Modern Operating System: Simulation
... The OS simulator is designed to support two main aspects of a computer system’s resource management: process management and memory management. The CPU code is visible to the OS simulator which is able to create multiple instances of the code as separate processes. The process scheduler includes supp ...
... The OS simulator is designed to support two main aspects of a computer system’s resource management: process management and memory management. The CPU code is visible to the OS simulator which is able to create multiple instances of the code as separate processes. The process scheduler includes supp ...
Process and Thread Scheduling - UC Davis
... Multiple levels of scheduling decisions • Long term Should a new “job” be “initiated,” or should it be held? o typical of batch systems o what might cause you to make a “hold” decision? ...
... Multiple levels of scheduling decisions • Long term Should a new “job” be “initiated,” or should it be held? o typical of batch systems o what might cause you to make a “hold” decision? ...
Threads, Introduction to Synchronization
... Definition: a timing dependent error involving shared state ...
... Definition: a timing dependent error involving shared state ...
Threads and Multi-threaded Programming
... – GNU Portable Threads • Thread management done at user space, by a thread library ...
... – GNU Portable Threads • Thread management done at user space, by a thread library ...