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Slides
... Often, more information is required than the identity of the desired system call – Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS – 1) Simplest: pass the parameters in registers • In some cases, may be more parameters than r ...
... Often, more information is required than the identity of the desired system call – Exact type and amount of information vary according to OS and call Three general methods used to pass parameters to the OS – 1) Simplest: pass the parameters in registers • In some cases, may be more parameters than r ...
System Calls
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
Operating System Services
... Operating systems provide an environment for execution of programs and services to programs and users One set of operating-system services provides functions that are helpful to the user: User interface - Almost all operating systems have a user interface (UI). Varies between Command-Line (CLI), ...
... Operating systems provide an environment for execution of programs and services to programs and users One set of operating-system services provides functions that are helpful to the user: User interface - Almost all operating systems have a user interface (UI). Varies between Command-Line (CLI), ...
Computers: Software Computer Layers
... codes. The compiler derives its name from the way it works, looking at the entire source code and collecting and reorganizing the instructions. Thus, a compiler differs from an interpreter, which analyzes and executes each line of source code successively, without analyzing the entire program. ...
... codes. The compiler derives its name from the way it works, looking at the entire source code and collecting and reorganizing the instructions. Thus, a compiler differs from an interpreter, which analyzes and executes each line of source code successively, without analyzing the entire program. ...
System Call - ShareCourse
... system call 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 addr ...
... system call 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 addr ...
the user program.
... higher level of abstraction of the computer. • The repertoire of commands supported by the kernel defines the “virtual machine” which is platformindependent. • To enter the kernel, the user program makes a system call by executing a trap instruction of some sort. • This instruction switches the proc ...
... higher level of abstraction of the computer. • The repertoire of commands supported by the kernel defines the “virtual machine” which is platformindependent. • To enter the kernel, the user program makes a system call by executing a trap instruction of some sort. • This instruction switches the proc ...
Operating-System Structures
... secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. ...
... secondary storage to back up main memory. Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. ...
2. OS Components
... The simplest approach is to pass the parameters in registers. In some cases, however, there may be more parameters than registers. In these cases, the parameters are generally stored in a block, or table, in memory, and the address of the block is passed as a parameter in a register. Parameter ...
... The simplest approach is to pass the parameters in registers. In some cases, however, there may be more parameters than registers. In these cases, the parameters are generally stored in a block, or table, in memory, and the address of the block is passed as a parameter in a register. Parameter ...
ppt - CSE Home
... The major OS issues • structure: how is the OS organized? What are the resources a program can use? • sharing: how are resources shared across users? • naming: how are resources named (by users or programs)? • security: how is the integrity of the OS and its resources ensured? • protection: how is ...
... The major OS issues • structure: how is the OS organized? What are the resources a program can use? • sharing: how are resources shared across users? • naming: how are resources named (by users or programs)? • security: how is the integrity of the OS and its resources ensured? • protection: how is ...
Chapter 1 - Introduction to Operating Systems
... – When one job needs to wait (e.g. I/O operation), CPU will switch to another job to execute – When the first job finishes waiting, CPU will get back to the first job to execute – Efficiently utilize all computing resources ...
... – When one job needs to wait (e.g. I/O operation), CPU will switch to another job to execute – When the first job finishes waiting, CPU will get back to the first job to execute – Efficiently utilize all computing resources ...
Chapter 2: System Structures
... System programs provide a convenient environment for program development and execution. They can be divided into: l ...
... System programs provide a convenient environment for program development and execution. They can be divided into: l ...
Java Programming 2 – Lecture #16 –
... Writing to a text file The FileWriter1 is the standard library class used for generating text file output. To avoid constant byte-‐level filesystem access, these objects are generally wrapped in BufferedWrit ...
... Writing to a text file The FileWriter1 is the standard library class used for generating text file output. To avoid constant byte-‐level filesystem access, these objects are generally wrapped in BufferedWrit ...
The Evolution of Operating Systems
... • The first thing performed by the computer when it is turned on (or re-booted) • The computer is designed so that it’s program counter will always point to one particular address in ROM. This is where a permanent program resides which gets the computer going. It directs the computer to load a progr ...
... • The first thing performed by the computer when it is turned on (or re-booted) • The computer is designed so that it’s program counter will always point to one particular address in ROM. This is where a permanent program resides which gets the computer going. It directs the computer to load a progr ...
Operating System Software The OS
... your kitchen doesn't need an operating system. The computer in a microwave oven simply runs a single program all the time. ...
... your kitchen doesn't need an operating system. The computer in a microwave oven simply runs a single program all the time. ...
The Datacenter Needs an Operating System
... RESOURCE SHARING “ To solve these interaction problems we would like to have a computer made simultaneously available to many users in a manner somewhat like a telephone exchange. Each user would be able to use a console at his own pace and without concern for the activity of others using the syste ...
... RESOURCE SHARING “ To solve these interaction problems we would like to have a computer made simultaneously available to many users in a manner somewhat like a telephone exchange. Each user would be able to use a console at his own pace and without concern for the activity of others using the syste ...
THE DATACENTER NEEDS AN OPERATING SYSTEM
... RESOURCE SHARING “ To solve these interaction problems we would like to have a computer made simultaneously available to many users in a manner somewhat like a telephone exchange. Each user would be able to use a console at his own pace and without concern for the activity of others using the syste ...
... RESOURCE SHARING “ To solve these interaction problems we would like to have a computer made simultaneously available to many users in a manner somewhat like a telephone exchange. Each user would be able to use a console at his own pace and without concern for the activity of others using the syste ...
System Structures
... The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values ...
... The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values ...
(MSWindows, LINUX, UNIX) (China)
... a file name can contain up to 255 characters including letters, numbers, spaces and some other printable characters. ...
... a file name can contain up to 255 characters including letters, numbers, spaces and some other printable characters. ...
History of Operating Systems
... • Jobs running in a modern OS can start processes that run in the memory of the OS, using drivers or other functions available through system calls • Each process shares the memory where the code resides, but is allocated separate memory for ...
... • Jobs running in a modern OS can start processes that run in the memory of the OS, using drivers or other functions available through system calls • Each process shares the memory where the code resides, but is allocated separate memory for ...
CGS 3460 PROGRAMMING USING C
... – A program is the driving force behind any job that any computer does • A program is a list of detailed instructions • These instructions are written in certain programming language ...
... – A program is the driving force behind any job that any computer does • A program is a list of detailed instructions • These instructions are written in certain programming language ...
lecture notes
... no other program may listen on that port If client and server do not obey the rules of the protocol, errors occur ...
... no other program may listen on that port If client and server do not obey the rules of the protocol, errors occur ...
Two general strategies for creating multiple threads
... library may be replaced by a new version, and all programs that reference the library will automatically use the new version. More than one version of a library may be loaded into memory, and each program uses its version information to decide which copy of the library to use. This system is also ...
... library may be replaced by a new version, and all programs that reference the library will automatically use the new version. More than one version of a library may be loaded into memory, and each program uses its version information to decide which copy of the library to use. This system is also ...
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.