What is a Process? Answer 1: a process is an abstraction of a
... • multiprogramming means having multiple processes existing at the same time • most modern, general purpose operating systems support multiprogramming • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the availab ...
... • multiprogramming means having multiple processes existing at the same time • most modern, general purpose operating systems support multiprogramming • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the availab ...
CENG334 Introduction to Operating Systems
... prepared by Matt Welsh, Andrew Tanenbaum (MOS3e) and others that I may have lost track of. I search the web for the best content out there and try to improve the slides both in form and content as much as possible as well as to complement them with my own. If your slides are among them, and not ackn ...
... prepared by Matt Welsh, Andrew Tanenbaum (MOS3e) and others that I may have lost track of. I search the web for the best content out there and try to improve the slides both in form and content as much as possible as well as to complement them with my own. If your slides are among them, and not ackn ...
INTRODUCTION OF PYTHON
... just run the program directly from the source code. Internally, Python converts the source code into an intermediate form called byte codes and then translates this into the native language of your computer and then runs it. All this, actually, makes using Python much easier since you don’t have to ...
... just run the program directly from the source code. Internally, Python converts the source code into an intermediate form called byte codes and then translates this into the native language of your computer and then runs it. All this, actually, makes using Python much easier since you don’t have to ...
Chapter 2: Operating
... Functions invoke the actual system calls on behalf of the programmer – Function CreateProcess() invokes system call NTCreateProcess() – Why not invoke actual system call (instead of using API) ? Because: » Program portability: compile/run on systems supporting same API Three most common APIs are ...
... Functions invoke the actual system calls on behalf of the programmer – Function CreateProcess() invokes system call NTCreateProcess() – Why not invoke actual system call (instead of using API) ? Because: » Program portability: compile/run on systems supporting same API Three most common APIs are ...
Patterns for Operating Systems Access Control
... (segment). In this way security and controlled sharing are possible. There is a variety of virtual memory address space structures: some systems use a set of separate address spaces, others a single-level address space. Further the VAS may be split between the users and the operating system. We wo ...
... (segment). In this way security and controlled sharing are possible. There is a variety of virtual memory address space structures: some systems use a set of separate address spaces, others a single-level address space. Further the VAS may be split between the users and the operating system. We wo ...
Chapter 1
... • Portable means that a program may be written on one type of computer and then run on a wide variety of computers, with little or no modification. • Java byte code runs on the JVM and not on any particular CPU; therefore, compiled Java programs are highly portable. • JVMs exist on many platforms: • ...
... • Portable means that a program may be written on one type of computer and then run on a wide variety of computers, with little or no modification. • Java byte code runs on the JVM and not on any particular CPU; therefore, compiled Java programs are highly portable. • JVMs exist on many platforms: • ...
CIS 175 Java Programming
... The drawing area is measured in pixels, with (0,0) at the upper-left corner. The import Statement The import statement includes existing Java programs in the current program. This allows you to reuse software. Java code is organized into packages and classes. Classes are inside packages, and package ...
... The drawing area is measured in pixels, with (0,0) at the upper-left corner. The import Statement The import statement includes existing Java programs in the current program. This allows you to reuse software. Java code is organized into packages and classes. Classes are inside packages, and package ...
Chapter 1: Introduction to Computers and Java
... • Portable means that a program may be written on one type of computer and then run on a wide variety of computers, with little or no modification. • Java byte code runs on the JVM and not on any particular CPU; therefore, compiled Java programs are highly portable. • JVMs exist on many platforms: • ...
... • Portable means that a program may be written on one type of computer and then run on a wide variety of computers, with little or no modification. • Java byte code runs on the JVM and not on any particular CPU; therefore, compiled Java programs are highly portable. • JVMs exist on many platforms: • ...
Discovering Computers 2006
... Summarize the features of several stand-alone operating systems Summarize the startup process on a personal computer Identify various network operating systems Describe the functions of an operating system ...
... Summarize the features of several stand-alone operating systems Summarize the startup process on a personal computer Identify various network operating systems Describe the functions of an operating system ...
Chapter 4
... When the main thread encounters a parallel region while executing the application, a team of threads is forked off, and these threads begin executing the code within the parallel region. ...
... When the main thread encounters a parallel region while executing the application, a team of threads is forked off, and these threads begin executing the code within the parallel region. ...
Network Operating Systems - Partha Dasgupta`s Workstation!
... Network Operating Systems extend the facilities and services provided by computer operating systems to support a set of computers, connected by a network. The environment managed by a network operating system consists of an interconnected group of machines that are loosely connected. By loosely conn ...
... Network Operating Systems extend the facilities and services provided by computer operating systems to support a set of computers, connected by a network. The environment managed by a network operating system consists of an interconnected group of machines that are loosely connected. By loosely conn ...
Discovering Computers 2006
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
Solution to Lab Project 2.1
... 6. Correct answer: C. DELTREE is the MS-DOS command that will allow you to delete a directory and its contents in one pass. A is incorrect because the DEL command can only delete files, not directories. B is incorrect because XCOPY is a copy command; it cannot delete files or directories. D is incor ...
... 6. Correct answer: C. DELTREE is the MS-DOS command that will allow you to delete a directory and its contents in one pass. A is incorrect because the DEL command can only delete files, not directories. B is incorrect because XCOPY is a copy command; it cannot delete files or directories. D is incor ...
Java Concurrency and IO
... • Sometimes one thread may be interested in the activities of another. Or, one could have a functional dependency on another. – Reading from a file or over a network? – Waiting for a given thread to return a result. – Polling (Busy Waiting) vs. Notification – BadConsumer Example ...
... • Sometimes one thread may be interested in the activities of another. Or, one could have a functional dependency on another. – Reading from a file or over a network? – Waiting for a given thread to return a result. – Polling (Busy Waiting) vs. Notification – BadConsumer Example ...
Operating-System Structures
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) ...
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) ...
Slides
... Client and user-on-client identification is insecure or complicated NFS is standard UNIX client-server file sharing protocol CIFS is standard Windows protocol Standard operating system file calls are translated into remote calls ...
... Client and user-on-client identification is insecure or complicated NFS is standard UNIX client-server file sharing protocol CIFS is standard Windows protocol Standard operating system file calls are translated into remote calls ...
Embedding Object Files in an Existing Operating System: A Practical Approach
... In general, file system is designed for a specific operating system [5]. File system always considers whether the operating system should recognize and support file types. If an operating system recognizes the type of a file, it can then operate on the file in reasonable ways. For example, a common ...
... In general, file system is designed for a specific operating system [5]. File system always considers whether the operating system should recognize and support file types. If an operating system recognizes the type of a file, it can then operate on the file in reasonable ways. For example, a common ...
Unit04_Software
... Flakey, bugs, crashes, instability. This is especially a problem in modern multitasking environments where one software product or utility conflicts with another resulting in freezes and crashes. ...
... Flakey, bugs, crashes, instability. This is especially a problem in modern multitasking environments where one software product or utility conflicts with another resulting in freezes and crashes. ...
Slide 1
... A. iOS is built on the Windows kernel, so it is ideal for smartphones because it has good resistance to malware. B. If you don’t like the user interface for Windows but want to run the vast variety of Windows software, you can install Linux. C. Linux and Mac OS have a reputation for being more ...
... A. iOS is built on the Windows kernel, so it is ideal for smartphones because it has good resistance to malware. B. If you don’t like the user interface for Windows but want to run the vast variety of Windows software, you can install Linux. C. Linux and Mac OS have a reputation for being more ...
Java Prerequisites
... Being architectural-neutral and having no implementation dependent aspects of the specification makes Java portable. Compiler in Java is written in ANSI C with a clean portability boundary which is a POSIX subset. ROBUST Java makes an effort to eliminate error prone situations by emphasizing mainly ...
... Being architectural-neutral and having no implementation dependent aspects of the specification makes Java portable. Compiler in Java is written in ANSI C with a clean portability boundary which is a POSIX subset. ROBUST Java makes an effort to eliminate error prone situations by emphasizing mainly ...
Processes and Threads
... information across processes is not easy. Threads are a type of light-weight processes that are widely used in such situations. • Every process has a single thread (of execution) by default, but can create several new threads once it starts. Threads of a process share memory corresponding to the cod ...
... information across processes is not easy. Threads are a type of light-weight processes that are widely used in such situations. • Every process has a single thread (of execution) by default, but can create several new threads once it starts. Threads of a process share memory corresponding to the cod ...
2.01
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application ...
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application ...
System Call
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application ...
... Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application ...
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.