History of Java
... instruction because each of the 0’s and 1’s is a bit, and there are 16 of them. Each object-code instruction is in charge of only a simple computer task. For example, an object-code instruction could possibly be in charge of copying a single number from some place in main memory to some place in the ...
... instruction because each of the 0’s and 1’s is a bit, and there are 16 of them. Each object-code instruction is in charge of only a simple computer task. For example, an object-code instruction could possibly be in charge of copying a single number from some place in main memory to some place in the ...
lec1
... – Error detection and response: external, internal, software or hardware error. – Accounting: Collect stats., load sharing , for billing purposes. ...
... – Error detection and response: external, internal, software or hardware error. – Accounting: Collect stats., load sharing , for billing purposes. ...
Introduction to Operating Systems - Seneca
... It has become a standard on which many other operating systems are modelled We will be using a command-line interface to communicate with UNIX ...
... It has become a standard on which many other operating systems are modelled We will be using a command-line interface to communicate with UNIX ...
Slide 1
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
Page table
... Some hardware independence HAL provides memory mapping, configuring I/O buses, setting up DMA, motherboard specific facilities Device drivers (I/O manager) can still work directly with ...
... Some hardware independence HAL provides memory mapping, configuring I/O buses, setting up DMA, motherboard specific facilities Device drivers (I/O manager) can still work directly with ...
Java Programming, Second edition
... the parent class Encapsulation – “data hiding”; programmer only needs to know the interface for a class, not its internal workings ...
... the parent class Encapsulation – “data hiding”; programmer only needs to know the interface for a class, not its internal workings ...
system call
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
Programming Style
... They cannot be possible without inheritance and polymorphism If you want to prepare those functionalities in the examples, you should consider the use of OO concepts Otherwise, your program will never be understandable (even for yourself), extensible, and reusable ...
... They cannot be possible without inheritance and polymorphism If you want to prepare those functionalities in the examples, you should consider the use of OO concepts Otherwise, your program will never be understandable (even for yourself), extensible, and reusable ...
Memory Protection
... • Protection state of system – Describes current settings, values of system relevant to protection ...
... • Protection state of system – Describes current settings, values of system relevant to protection ...
CS 4410/4411 Systems Programming and Operating Systems
... • Operating systems are a class of exceptionally complex systems – They are large, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
... • Operating systems are a class of exceptionally complex systems – They are large, parallel, very expensive, not understood • Windows NT/XP: 10 years, 1000s of people, … ...
Computer Hardware: 2500 BC - Computer Science and Engineering
... • powerful enough to implement the Unix kernel • in 1978 Dennis Ritchie and Brian Kernighan published “The C Programming Language” • now considered low-level, widely used for system and application programming ...
... • powerful enough to implement the Unix kernel • in 1978 Dennis Ritchie and Brian Kernighan published “The C Programming Language” • now considered low-level, widely used for system and application programming ...
2. Operating System Structure
... System calls provide an interface to the OS services. These calls are usually C or C++ routines, but can also be in assembly for low-level tasks of HW. Even simple programs may use the OS heavily, thousands of system calls per second. Example: a program reading data from one file and copy them to an ...
... System calls provide an interface to the OS services. These calls are usually C or C++ routines, but can also be in assembly for low-level tasks of HW. Even simple programs may use the OS heavily, thousands of system calls per second. Example: a program reading data from one file and copy them to an ...
Batch systems
... Operating systems have been evolving through the years ... Since operating systems have historically been closely tied to the architecture of the computers on which they run, we will look at successive generations of computers to see what their operating systems were like. This mapping of operating ...
... Operating systems have been evolving through the years ... Since operating systems have historically been closely tied to the architecture of the computers on which they run, we will look at successive generations of computers to see what their operating systems were like. This mapping of operating ...
tbc 302 operating systems
... A student who successfully fulfills the course requirements will be able to: a) High level understand what is an operating system and the role it plays b) A high level understanding of the structure of operating systems, applications, and the relationship between them c) Some knowledge of the servic ...
... A student who successfully fulfills the course requirements will be able to: a) High level understand what is an operating system and the role it plays b) A high level understanding of the structure of operating systems, applications, and the relationship between them c) Some knowledge of the servic ...
Assignment 3
... 4) Why is it not always a good idea to aim at implementing the highest degree of transparency possible? Although distribution transparency is generally preferable for any distribute system, there are situations in which attempting to blindly hide all distribution aspects from users is not an always ...
... 4) Why is it not always a good idea to aim at implementing the highest degree of transparency possible? Although distribution transparency is generally preferable for any distribute system, there are situations in which attempting to blindly hide all distribution aspects from users is not an always ...
Operating System
... This course introduces the fundamentals of operating systems. Topics include interprocess communication, process scheduling, deadlock, memory management, virtual memory, and file system. Formal principles are illustrated with examples and case studies of one or more contemporary operating system. ...
... This course introduces the fundamentals of operating systems. Topics include interprocess communication, process scheduling, deadlock, memory management, virtual memory, and file system. Formal principles are illustrated with examples and case studies of one or more contemporary operating system. ...
system call - efreidoc.fr
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
... As we saw last week in a operating system programs are not allowed direct access to any of the resources except CPU and memory and even then the use has limits placed on it. Thus 1. OS handles requests from programs for various resources to do things e.g. input or output something and enforces the l ...
Chapter 2 Operating System Overview Operating System Overview
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
Operating System Overview
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
Chapter 2Operating System Overview
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
... • Multiple jobs in memory must be protected from each other’s data • File system must be protected so that only authorised users can access • Contention for resources must be handled – Printers, storage etc ...
Introduction - Stanford Secure Computer Systems Group
... • Protect memory of one program from actions of another • Definitions - Address space: all memory locations a program can name - Virtual address: addresses in process’ address space - Physical address: address of real memory - Translation: map virtual to physical addresses • Translation done on ever ...
... • Protect memory of one program from actions of another • Definitions - Address space: all memory locations a program can name - Virtual address: addresses in process’ address space - Physical address: address of real memory - Translation: map virtual to physical addresses • Translation done on ever ...
LIBRARY ACCESS SYSTEM SMARTPHONE APPLICATION USING
... go a long way[10].Internet made the Users to access their database 24x7 which was stored centralized. Later emerged the mobile technology [12] and now mobility has become everything. Initially many famous mobility platforms which includes Flash UI, Bada, Symbian etc., later on the introduction of th ...
... go a long way[10].Internet made the Users to access their database 24x7 which was stored centralized. Later emerged the mobile technology [12] and now mobility has become everything. Initially many famous mobility platforms which includes Flash UI, Bada, Symbian etc., later on the introduction of th ...
Introduction
... • OS implements the abstract concept of file by managing mass storage media (disk etc) and devices that control them • Files usually organized into directories • Access control on most systems to determine who can access what • File-System management – Creating and deleting files and directories – P ...
... • OS implements the abstract concept of file by managing mass storage media (disk etc) and devices that control them • Files usually organized into directories • Access control on most systems to determine who can access what • File-System management – Creating and deleting files and directories – P ...
CH3
... interpreters for common programming languages (such as C, C++, Java, Visual Basic, and PERL) are often provided to the user with the operating system. Some of these programs are now provided separately. Operating System Concepts ...
... interpreters for common programming languages (such as C, C++, Java, Visual Basic, and PERL) are often provided to the user with the operating system. Some of these programs are now provided separately. Operating System Concepts ...
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.