lecture4-sept13
... • Parent may terminate execution of children processes (abort) – Child has exceeded allocated resources – Task assigned to child is no longer required – If parent is exiting • Some operating system do not allow child to continue if its parent terminates – All children terminated - cascading terminat ...
... • Parent may terminate execution of children processes (abort) – Child has exceeded allocated resources – Task assigned to child is no longer required – If parent is exiting • Some operating system do not allow child to continue if its parent terminates – All children terminated - cascading terminat ...
Abstract View of System Components
... kernel and returns status of the system call and any return values The callers need know nothing about how the system call is implemented – Just needs to obey API and understand what OS will do as a result call – Most details of OS interface hidden from programmer by API Managed by run-time suppor ...
... kernel and returns status of the system call and any return values The callers need know nothing about how the system call is implemented – Just needs to obey API and understand what OS will do as a result call – Most details of OS interface hidden from programmer by API Managed by run-time suppor ...
Efficient System-Enforced Deterministic Parallelism Yale University Abstract
... goals. Due to its OS-level approach, Determinator supports existing languages, can enforce deterministic execution not only on a single process but on groups of interacting processes, and can prevent malicious user-level code from subverting the kernel’s guarantee of determinism. In order to explore ...
... goals. Due to its OS-level approach, Determinator supports existing languages, can enforce deterministic execution not only on a single process but on groups of interacting processes, and can prevent malicious user-level code from subverting the kernel’s guarantee of determinism. In order to explore ...
2.01 - SEJONG
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
Windows booting procedure
... a) POST - POST stands for Power On Self Test. POST checks all the hardware devices connected to a computer like RAM, hard disk etc and make sure that the system can run smoothly with those hardware devices. If the POST is a failure the system halts with a beep sound. b) Now BIOS checks the boot prio ...
... a) POST - POST stands for Power On Self Test. POST checks all the hardware devices connected to a computer like RAM, hard disk etc and make sure that the system can run smoothly with those hardware devices. If the POST is a failure the system halts with a beep sound. b) Now BIOS checks the boot prio ...
as a PDF
... suspends current process until one of its children terminates return value is the pid of the child process that terminated if child_status != NULL, then the object it points to will be set to a status indicating why the child process terminated ...
... suspends current process until one of its children terminates return value is the pid of the child process that terminated if child_status != NULL, then the object it points to will be set to a status indicating why the child process terminated ...
Network Operating Systems - Partha Dasgupta`s Workstation!
... structure at each the workstation. While many different configurations are possible by the innovative use of remote mounting, the system configuration shown in Figure 1 is quite commonly used. This is called the dataless workstation configuration. Is such a setup, all files, data and critical applic ...
... structure at each the workstation. While many different configurations are possible by the innovative use of remote mounting, the system configuration shown in Figure 1 is quite commonly used. This is called the dataless workstation configuration. Is such a setup, all files, data and critical applic ...
LinuxOS-SGOSbookCh20
... 1. Normal kernel code is nonpreemptible (until 2.4) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is ...
... 1. Normal kernel code is nonpreemptible (until 2.4) – when a time interrupt is received while a process is executing a kernel system service routine, the kernel’s need_resched flag is set so that the scheduler will run once the system call has completed and control is ...
AOSScheduling
... Implemented by having multiple ready queues to represent each level of priority Scheduler the process of a higher priority over one of lower priority Lower-priority may suffer starvation To alleviate starvation allow dynamic priorities The priority of a process changes based on its age or execution ...
... Implemented by having multiple ready queues to represent each level of priority Scheduler the process of a higher priority over one of lower priority Lower-priority may suffer starvation To alleviate starvation allow dynamic priorities The priority of a process changes based on its age or execution ...
Spawn server
... tailored to exactly meet a user’s need, even as that need grows or shrinks rapidly. • Thus, through IaaS systems, users should be able to purchase just the right amount of computing, memory, I/O, and storage to meet their needs at any given time. • Unfortunately, current IaaS systems lack systemwide ...
... tailored to exactly meet a user’s need, even as that need grows or shrinks rapidly. • Thus, through IaaS systems, users should be able to purchase just the right amount of computing, memory, I/O, and storage to meet their needs at any given time. • Unfortunately, current IaaS systems lack systemwide ...
3. Operating Systems - Informática Ingeniería en Electrónica y
... The OS construct another level of abstraction presenting the user a virtual or extended machine with a much simpler use. It hides fine working details the user does not need to know (e.g. how to manage the read/write head of a magnetic disc) It provides an extra set of instructions, the System Cal ...
... The OS construct another level of abstraction presenting the user a virtual or extended machine with a much simpler use. It hides fine working details the user does not need to know (e.g. how to manage the read/write head of a magnetic disc) It provides an extra set of instructions, the System Cal ...
Operating Systems
... Blocking - process suspended until I/O completed – Easy to use and understand – Insufficient for some needs Nonblocking - I/O call returns as much as available – E.g., User interface that received keyboard input while processing and displaying data on the screen – One approach: Implemented via multi ...
... Blocking - process suspended until I/O completed – Easy to use and understand – Insufficient for some needs Nonblocking - I/O call returns as much as available – E.g., User interface that received keyboard input while processing and displaying data on the screen – One approach: Implemented via multi ...
Intro and using Linux Commands
... services provide mechanisms for… Execution of a program, Input and output operations performed by programs, ...
... services provide mechanisms for… Execution of a program, Input and output operations performed by programs, ...
Concurrency: mutual exclusion and synchronization
... 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 procedures are critical sections. A monitor may have a queue of processes that are waiting to access it. ...
... 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 procedures are critical sections. A monitor may have a queue of processes that are waiting to access it. ...
Processes
... executing in parallel. This speed up can be achieved only if the computer has multiple processing elements (such as CPUs or I/O channels). – Modularity – construct a system in a modular function (i.e., dividing the system functions into separate processes). – Convenience – one user may have many tas ...
... executing in parallel. This speed up can be achieved only if the computer has multiple processing elements (such as CPUs or I/O channels). – Modularity – construct a system in a modular function (i.e., dividing the system functions into separate processes). – Convenience – one user may have many tas ...
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: ...
Quick History of Open Source
... • Dennis Ritchie & Ken Thomson along with few others started fresh on what their mind’s eye had so illustriously envisioned • They released the first version of multi-user system UNIX • Unix originally called UNICS (Uniplexed Information and ...
... • Dennis Ritchie & Ken Thomson along with few others started fresh on what their mind’s eye had so illustriously envisioned • They released the first version of multi-user system UNIX • Unix originally called UNICS (Uniplexed Information and ...
Embedded Linux Design and Programming
... Process is an independently running program that has its own set of resources (i.e. output file). Process managed with process descriptors (struct task_struct) in circular doubly-linked list. Use light weight processes or threads to support multithreaded operation. Light weight processes share ...
... Process is an independently running program that has its own set of resources (i.e. output file). Process managed with process descriptors (struct task_struct) in circular doubly-linked list. Use light weight processes or threads to support multithreaded operation. Light weight processes share ...
tasks, threads and processes, confused?
... the parameters must be passed. In addition, any return values must be given a placeholder to write to. Finally, memory must be reserved for local variables. For general-‐purpose programming, arguments, local ...
... the parameters must be passed. In addition, any return values must be given a placeholder to write to. Finally, memory must be reserved for local variables. For general-‐purpose programming, arguments, local ...
Operating System Support for Virtual Machines
... UMLinux • What is UMLinux? – UMLinux is a Type II VMM , a case Type II VMM studied in this paper – It runs upon Linux and the guest operating systems and guest applications run as a single process. – Note: The interfaces provided by UMLinux is similar but not identical to underlying hardware, so mod ...
... UMLinux • What is UMLinux? – UMLinux is a Type II VMM , a case Type II VMM studied in this paper – It runs upon Linux and the guest operating systems and guest applications run as a single process. – Note: The interfaces provided by UMLinux is similar but not identical to underlying hardware, so mod ...
Today: Protection Protection
... • Specification of protection in a programming language allows the high-level description of policies for the allocation and use of resources. • Language implementation can provide software for protection enforcement when automatic hardwaresupported checking is unavailable. • Interpret protection ...
... • Specification of protection in a programming language allows the high-level description of policies for the allocation and use of resources. • Language implementation can provide software for protection enforcement when automatic hardwaresupported checking is unavailable. • Interpret protection ...
Operating Systems Operating Systems Operating Systems
... – important if there is to be more than one type of computer using the operating system or if the hardware is to change. – A consistent application programming interface (API) allows a software developer to write an application on one computer and have a high level of confidence that it will run on ...
... – important if there is to be more than one type of computer using the operating system or if the hardware is to change. – A consistent application programming interface (API) allows a software developer to write an application on one computer and have a high level of confidence that it will run on ...