What is an Operating System?
... – How to avoid interference between processes? – How to achieve cooperation between processes? ...
... – How to avoid interference between processes? – How to achieve cooperation between processes? ...
Introduction to Object Technology
... • Methods for structuring operating system software – Modular software – Hierarchical structure: hierarchical layers and information abstraction • View the system as a series of levels • Each level performs a related subset of functions • Each level relies on the next lower level to perform more pri ...
... • Methods for structuring operating system software – Modular software – Hierarchical structure: hierarchical layers and information abstraction • View the system as a series of levels • Each level performs a related subset of functions • Each level relies on the next lower level to perform more pri ...
Desktop PC Operating Systems
... 3. Go to that cluster and retrieve the data. 4. Go to the FAT table and find the starting cluster and then look up the Pointer Cluster. 5. Go to that cluster and retrieve the data (combining it with previous data for the file). 6. Repeat steps 3 – 5 until a null pointer is found (which indicates the ...
... 3. Go to that cluster and retrieve the data. 4. Go to the FAT table and find the starting cluster and then look up the Pointer Cluster. 5. Go to that cluster and retrieve the data (combining it with previous data for the file). 6. Repeat steps 3 – 5 until a null pointer is found (which indicates the ...
Lecture 3: Concurrency
... • Most modern OS kernel – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... • Most modern OS kernel – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
PyStream: Compiling Python onto the GPU
... GLSL code. For instance, GLSL programs are constrained to have no global side effects. Code compiled by PyStream must behave the same. GLSL does not allow recursive function calls because it is designed to run on hardware without a call stack. This restriction is adopted by PyStream. Similarly, GLSL ...
... GLSL code. For instance, GLSL programs are constrained to have no global side effects. Code compiled by PyStream must behave the same. GLSL does not allow recursive function calls because it is designed to run on hardware without a call stack. This restriction is adopted by PyStream. Similarly, GLSL ...
Chapter 10
... From its inception, Linux was created to use both physical and virtual memory efficiently ...
... From its inception, Linux was created to use both physical and virtual memory efficiently ...
SanOS - jbox.dk
... • Would be nice characteristics for an IT business system! • By the way...next generation of home appliances: Broadband router, DHCP, DNS,... ...
... • Would be nice characteristics for an IT business system! • By the way...next generation of home appliances: Broadband router, DHCP, DNS,... ...
ppt
... • Most modern OS kernels – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... • Most modern OS kernels – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
Ebook Programming tools developers
... development: gvNIX gvNIX is an open source tool for rapid application development (RAD). With this tool, any developer can create web applications in Java quickly and without much trouble. The tool offers integration with frameworks such as jQuery, Bootstrap 3, Leaflet or Datatables. ...
... development: gvNIX gvNIX is an open source tool for rapid application development (RAD). With this tool, any developer can create web applications in Java quickly and without much trouble. The tool offers integration with frameworks such as jQuery, Bootstrap 3, Leaflet or Datatables. ...
Introduction to Operating Systems
... 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 Modern CPUs do this in hardware for speed ...
... 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 Modern CPUs do this in hardware for speed ...
The Evolution of the Unix Time
... pleasant niche we occupied, because no similar ones were available; even the time-sharing service that would later be offered under GE’s operating system did not exist. What we wanted to preserve was not just a good environment in which to do programming, but a system around which a fellowship coul ...
... pleasant niche we occupied, because no similar ones were available; even the time-sharing service that would later be offered under GE’s operating system did not exist. What we wanted to preserve was not just a good environment in which to do programming, but a system around which a fellowship coul ...
The Evolution of the Unix Time-sharing System
... Throughout 1969 we (mainly Ossanna, Thompson, Ritchie) lobbied intensively for the purchase of a medium-scale machine for which we promised to write an operating system; the machines we suggested were the DEC PDP-10 and the SDS (later Xerox) Sigma 7. The effort was frustrating, because our proposals ...
... Throughout 1969 we (mainly Ossanna, Thompson, Ritchie) lobbied intensively for the purchase of a medium-scale machine for which we promised to write an operating system; the machines we suggested were the DEC PDP-10 and the SDS (later Xerox) Sigma 7. The effort was frustrating, because our proposals ...
Windows File System
... perform more primitive functions • It provides services to the next higher layer. • Changes in one layer should not require changes in other layers ...
... perform more primitive functions • It provides services to the next higher layer. • Changes in one layer should not require changes in other layers ...
Lesson-13 A complete C Program (69 KB)
... The first line of this program is # include, is the
file which has definitions of standard input output files, this file
must be included in every C program as every program obviously
needs printf and scanf statements. The second line, main ( ) function
which is followed by curly ...
... The first line of this program is # include
Course Overview
... – Might NOT major in CSIE but are interested in programming techniques, and – Have accomplished the courses in software engineering track: FIT-I basic & FIT-I pro, and – Are willing to prepare for intermediate and ...
... – Might NOT major in CSIE but are interested in programming techniques, and – Have accomplished the courses in software engineering track: FIT-I basic & FIT-I pro, and – Are willing to prepare for intermediate and ...
FileSystems
... Can simulate last two with first method by inserting appropriate control characters. Need at least executable binary and data Type indicated by “type” extension Resource fork (Mac) Magic number (UNIX) More complexity requires more OS support ...
... Can simulate last two with first method by inserting appropriate control characters. Need at least executable binary and data Type indicated by “type” extension Resource fork (Mac) Magic number (UNIX) More complexity requires more OS support ...
OPERATING SYSTEM STRUCTURES
... Generic device driver code Drivers for each device - translate read/write requests into disk position commands. ...
... Generic device driver code Drivers for each device - translate read/write requests into disk position commands. ...
Full Text
... Reference Monitor: references monitor how programs run in the objective system and if the system sidesteps a security policy, it would prevent it from proceeding. Security mechanisms may be installed on system hardware and system software usually either implements reference monitors directly or faci ...
... Reference Monitor: references monitor how programs run in the objective system and if the system sidesteps a security policy, it would prevent it from proceeding. Security mechanisms may be installed on system hardware and system software usually either implements reference monitors directly or faci ...
ppt
... • Most modern OS kernels – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... • Most modern OS kernels – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
DOS Tutorial
... Every disk drive has a root directory which can have subdirectories which are named in the same format as filenames, (though generally without any extension). The subdirectories can have subdirectories and so on. Eg: a floppy disk might contain the following directory structure: PICTURES [a director ...
... Every disk drive has a root directory which can have subdirectories which are named in the same format as filenames, (though generally without any extension). The subdirectories can have subdirectories and so on. Eg: a floppy disk might contain the following directory structure: PICTURES [a director ...
ch01_old1
... all aspects of software design and implementation. Software can be designed an implemented in a variety of ways, and the OO paradigm is one; you will learn others over the next few years. Currently, the OO approach is the most widely used. ...
... all aspects of software design and implementation. Software can be designed an implemented in a variety of ways, and the OO paradigm is one; you will learn others over the next few years. Currently, the OO approach is the most widely used. ...
- Missouri State University
... • Sequence: do A, do B, do C, … • Selection: if…then • Loop: automated repetition ...
... • Sequence: do A, do B, do C, … • Selection: if…then • Loop: automated repetition ...
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.