seminar on operating systems - Universidad Técnica Federico Santa
... distributed and real-time systems. The course is divided into two parts. The first part focuses on the study of general concepts related to the structure of an operating system: process scheduling and synchronization, memory management, and stable storage. The second part involves detailed analysis ...
... distributed and real-time systems. The course is divided into two parts. The first part focuses on the study of general concepts related to the structure of an operating system: process scheduling and synchronization, memory management, and stable storage. The second part involves detailed analysis ...
virtual machine
... • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep track of which users use how much ...
... • Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them – Accounting - To keep track of which users use how much ...
Java Concepts Ch1 (Introduction to Hardware and Software slides 1
... programmer did not intend. Program runs without an error message. ...
... programmer did not intend. Program runs without an error message. ...
Slide 1
... •Windows NT - Microsoft’s multitasking OS which allows multiple users to share resources such as data and programs. •Windows 2000 - successor to Windows NT ...
... •Windows NT - Microsoft’s multitasking OS which allows multiple users to share resources such as data and programs. •Windows 2000 - successor to Windows NT ...
Slides 2 - USC Upstate: Faculty
... • Moves as much from the kernel into “user” space – Small core OS running at kernel level – OS Services built from many independent user-level processes – Communication between modules with message passing ...
... • Moves as much from the kernel into “user” space – Small core OS running at kernel level – OS Services built from many independent user-level processes – Communication between modules with message passing ...
Operating Systems - Mid Yell Junior High School
... The OS manage the files stored on backing storage devices. Backing store stores both: Program files: contain all the instructions needed to run a program. Data file: are data documents produced when using a program. ...
... The OS manage the files stored on backing storage devices. Backing store stores both: Program files: contain all the instructions needed to run a program. Data file: are data documents produced when using a program. ...
after_introduction
... can provide fair service to many clients can improve response time allow programmers to focus only on sequential execution of each thread ...
... can provide fair service to many clients can improve response time allow programmers to focus only on sequential execution of each thread ...
Module 3: Operating
... • Main memory is a volatile storage device. It loses its contents in the case of system failure. • The operating system is responsible for the following activities in connections with memory management: – Keep track of which parts of memory are currently being used and by whom. – Decide which proces ...
... • Main memory is a volatile storage device. It loses its contents in the case of system failure. • The operating system is responsible for the following activities in connections with memory management: – Keep track of which parts of memory are currently being used and by whom. – Decide which proces ...
PDF
... cards or tape r OS knew how to read next job in, execute it and when it is done take control back to read next job r Operating system stayed in memory ...
... cards or tape r OS knew how to read next job in, execute it and when it is done take control back to read next job r Operating system stayed in memory ...
OS_Structure
... • For all but the smallest systems, such an unstructured approach leads to a highly unreliable system. It is difficult or impossible to predict the effects of any changes because we cannot determine which parts of the system rely on the procedures or data that were changed. • Because of this problem ...
... • For all but the smallest systems, such an unstructured approach leads to a highly unreliable system. It is difficult or impossible to predict the effects of any changes because we cannot determine which parts of the system rely on the procedures or data that were changed. • Because of this problem ...
Powerpoint source
... implement your application (only true if you are not the OS programmer). • A software layer to abstract away and manage details of hardware resources – Provides users (application programmers) with “logical” well-behaved environment – O.S. defines a set of logical resources (objects) and a set of we ...
... implement your application (only true if you are not the OS programmer). • A software layer to abstract away and manage details of hardware resources – Provides users (application programmers) with “logical” well-behaved environment – O.S. defines a set of logical resources (objects) and a set of we ...
now
... system call and any return values The caller 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 support library (set of functions built ...
... system call and any return values The caller 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 support library (set of functions built ...
Operating System Overview: Part 1 1 Objectives and functions
... With multiprogramming, the utilization of processor is greatly improved, but it has its own problems. To run multiple programs concurrently, the memory should be organized properly so that each program has its own space and does not invade others’. What’s more, at some moment, there may be more than ...
... With multiprogramming, the utilization of processor is greatly improved, but it has its own problems. To run multiple programs concurrently, the memory should be organized properly so that each program has its own space and does not invade others’. What’s more, at some moment, there may be more than ...
ppt
... • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
... • Programmer time wasted! “Sigh. In the good old days….” – Time-sharing – Multics (sorta) – New problems ...
SelfExploratorium - Department of Computer Science
... – VRI designing future user interface; one facet: it learns what kind of user is trying to use it This is something that every good teacher does, but (amazingly) has not been in any existing UI. ...
... – VRI designing future user interface; one facet: it learns what kind of user is trying to use it This is something that every good teacher does, but (amazingly) has not been in any existing UI. ...
Document
... This course involves study of concepts and components of general purpose operating systems. These include the study of processes and process synchronization, multithreaded applications, deadlocks, memory management, and file systems. UNIX and Windows NT are general purpose operating systems used as ...
... This course involves study of concepts and components of general purpose operating systems. These include the study of processes and process synchronization, multithreaded applications, deadlocks, memory management, and file systems. UNIX and Windows NT are general purpose operating systems used as ...
What in the World Is Alan Kay Up To?
... – VRI designing future user interface; one facet: it learns what kind of user is trying to use it This is something that every good teacher does, but (amazingly) has not been in any existing UI. ...
... – VRI designing future user interface; one facet: it learns what kind of user is trying to use it This is something that every good teacher does, but (amazingly) has not been in any existing UI. ...
Memory Protection: Kernel and User Address Spaces
... Physically, different pages can be mapping to different locations of the physical memory. ...
... Physically, different pages can be mapping to different locations of the physical memory. ...
Lecture slides
... • Identifier: A unique integer associated with a process • State : A currently executing process is in running state • Priority : Priority level relative to other processes • Program counter : Address of the next instruction of the program to be executed. • Memory pointers: pointers to the program c ...
... • Identifier: A unique integer associated with a process • State : A currently executing process is in running state • Priority : Priority level relative to other processes • Program counter : Address of the next instruction of the program to be executed. • Memory pointers: pointers to the program c ...
Components of an operating system
... Components of an operating system An operating system is a software program that provides an interface between the user and the computer and manages thousands of applications. Most computer systems are sold with an operating system installed. Computers that are designed for individual users are call ...
... Components of an operating system An operating system is a software program that provides an interface between the user and the computer and manages thousands of applications. Most computer systems are sold with an operating system installed. Computers that are designed for individual users are call ...
Library (computing)
In computer science, a library is a collection of non-volatile resources used by computer programs, often to develop software. These may include configuration data, documentation, help data, message templates, pre-written code and subroutines, classes, values or type specifications. In IBM's OS/360 and its successors they are referred to as partitioned data sets.In computer science, a library is a collection of implementations of behavior, written in terms of a language, that has a well-defined interface by which the behavior is invoked. This means that as long as a higher level program uses a library to make system calls, it does not need to be re-written to implement those system calls over and over again. In addition, the behavior is provided for reuse by multiple independent programs. A program invokes the library-provided behavior via a mechanism of the language. For example, in a simple imperative language such as C, the behavior in a library is invoked by using C's normal function-call. What distinguishes the call as being to a library, versus being to another function in the same program, is the way that the code is organized in the system. Library code is organized in such a way that it can be used by multiple programs that have no connection to each other, while code that is part of a program is organized to only be used within that one program. This distinction can gain a hierarchical notion when a program grows large, such as a multi-million-line program. In that case, there may be internal libraries that are reused by independent sub-portions of the large program. The distinguishing feature is that a library is organized for the purposes of being reused by independent programs or sub-programs, and the user only needs to know the interface, and not the internal details of the library.The value of a library is the reuse of the behavior. When a program invokes a library, it gains the behavior implemented inside that library without having to implement that behavior itself. Libraries encourage the sharing of code in a modular fashion, and ease the distribution of the code. The behavior implemented by a library can be connected to the invoking program at different program lifecycle phases. If the code of the library is accessed during the build of the invoking program, then the library is called a static library. An alternative is to build the executable of the invoking program and distribute that, independently from the library implementation. The library behavior is connected after the executable has been invoked to be executed, either as part of the process of starting the execution, or in the middle of execution. In this case the library is called a dynamic library. A dynamic library can be loaded and linked as part of preparing a program for execution, by the linker. Alternatively, in the middle of execution, an application may explicitly request that a module be loaded.Most compiled languages have a standard library although programmers can also create their own custom libraries. Most modern software systems provide libraries that implement the majority of system services. Such libraries have commoditized the services which a modern application requires. As such, most code used by modern applications is provided in these system libraries.