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 ...
02_OperatingSystemOverview
... • 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 ...
Partial Evaluation
... INPUTstatic: the part of the input data known at compile time INPUTdynamic: the part of the input data known at run time If we write it like this: P: INPUTstatic → {INPUTdynamic → OUTPUT} The residual in the bracket can be seen as specialized program. A partial evaluator is an algorithm which, when ...
... INPUTstatic: the part of the input data known at compile time INPUTdynamic: the part of the input data known at run time If we write it like this: P: INPUTstatic → {INPUTdynamic → OUTPUT} The residual in the bracket can be seen as specialized program. A partial evaluator is an algorithm which, when ...
Introduction
... Operating System Concepts • Processes – Each process is uniquely identified with a process id – The O/S will in most cases store information in a process table – The process id is used to locate this information. – A process can cause other processes to be created – Unix for example implements proc ...
... Operating System Concepts • Processes – Each process is uniquely identified with a process id – The O/S will in most cases store information in a process table – The process id is used to locate this information. – A process can cause other processes to be created – Unix for example implements proc ...
Operating 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 caller need know nothing about how the system call is implemented ...
... The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values • The caller need know nothing about how the system call is implemented ...
Operating Systems
... For load-time dynamic linking: Load module to be loaded is read into memory. Any reference to a target external module causes that module to be loaded and the references are updated to a relative address from the start base address of the application module. With run-time dynamic loading: Some of th ...
... For load-time dynamic linking: Load module to be loaded is read into memory. Any reference to a target external module causes that module to be loaded and the references are updated to a relative address from the start base address of the application module. With run-time dynamic loading: Some of th ...
Operating Systems
... • 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 ...
ppt
... • Compile time binding gives us absolute code. • Load time binding assigns physical addresses as the program is loaded into memory. —With load time, binding the program cannot be moved! ...
... • Compile time binding gives us absolute code. • Load time binding assigns physical addresses as the program is loaded into memory. —With load time, binding the program cannot be moved! ...
operating system
... system’s command line interface Look at how MS Windows has developed from MS-DOS ...
... system’s command line interface Look at how MS Windows has developed from MS-DOS ...
Introduction
... System calls to allocate/deallocate memory System calls for communication - signals ...
... System calls to allocate/deallocate memory System calls for communication - signals ...
Free/Open Source Integrated Library Management System
... Features of Free Software • the freedom to run the program, for any purpose • the freedom to study how the program works, and adapt it to local needs • the freedom to redistribute copies so others can benefit from the software • the freedom to improve the program, and release the improved version t ...
... Features of Free Software • the freedom to run the program, for any purpose • the freedom to study how the program works, and adapt it to local needs • the freedom to redistribute copies so others can benefit from the software • the freedom to improve the program, and release the improved version t ...
First Program in Java
... Line 5 is where the program execution starts. The java interpreter must find this defined exactly as given or it will refuse to run the program. (However you can change the name of parameter that is passed to main. i.e. you can write String[] argv or String[] someParam instead of String[] args) Othe ...
... Line 5 is where the program execution starts. The java interpreter must find this defined exactly as given or it will refuse to run the program. (However you can change the name of parameter that is passed to main. i.e. you can write String[] argv or String[] someParam instead of String[] args) Othe ...
virtual machine
... • MS-DOS – written to provide the most functionality in the least space – Not divided into modules – Although MS-DOS has some structure, its interfaces and levels of functionality are not well ...
... • MS-DOS – written to provide the most functionality in the least space – Not divided into modules – Although MS-DOS has some structure, its interfaces and levels of functionality are not well ...
Introduction - UW Courses Web Server
... multiprogramming. Each user has at least one separate program in memory. A program in execution is referred to as a process. Process switch occur so frequently that the users can interact with each program while it is running. File system allows users to access data and program interactively. CSS430 ...
... multiprogramming. Each user has at least one separate program in memory. A program in execution is referred to as a process. Process switch occur so frequently that the users can interact with each program while it is running. File system allows users to access data and program interactively. CSS430 ...
Stack implementation in Java
... Memory leaks in Java? As the stack grows and shrinks objects that were popped off will not be garbage collected ...
... Memory leaks in Java? As the stack grows and shrinks objects that were popped off will not be garbage collected ...
File System - QES Main Website
... Activity - File System • The File System means the methods used by an OS to name & store files so they can be opened quickly and easily • The File System lets to access files on storage devices, such as the hard drive • It also allow us to access external storage devices, such as USB sticks • And is ...
... Activity - File System • The File System means the methods used by an OS to name & store files so they can be opened quickly and easily • The File System lets to access files on storage devices, such as the hard drive • It also allow us to access external storage devices, such as USB sticks • And is ...
Computer Review
... which is a list of memory locations which the process can read and write to. The address space contains the executable program, the program’s data and its stack. Also associated with each process is some set of registers , including the program counter, stack pointer and other hardware registers and ...
... which is a list of memory locations which the process can read and write to. The address space contains the executable program, the program’s data and its stack. Also associated with each process is some set of registers , including the program counter, stack pointer and other hardware registers and ...
L6_Intro to programming
... components using the Java programming language • includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform • Except for the appletviewer, these tools do not provide a graphical user interface ...
... components using the Java programming language • includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform • Except for the appletviewer, these tools do not provide a graphical user interface ...
Implementation of Log Based File Systems on Open Source
... components and software components, have similar sets of advantages and disadvantages One area of research is the tradeoffs associated with particular types of file systems. The file system is a software component that directly works with the hardware of the computer; it determines how and where fil ...
... components and software components, have similar sets of advantages and disadvantages One area of research is the tradeoffs associated with particular types of file systems. The file system is a software component that directly works with the hardware of the computer; it determines how and where fil ...
operating systems
... Refers to a computer system's ability to support more than one process (program) at the same time. Multiprocessing operating systems enable several programs to run concurrently. UNIX is one of the most widely used multiprocessing systems. Refers to the utilization of multiple CPUs in a single comput ...
... Refers to a computer system's ability to support more than one process (program) at the same time. Multiprocessing operating systems enable several programs to run concurrently. UNIX is one of the most widely used multiprocessing systems. Refers to the utilization of multiple CPUs in a single comput ...
COS 318: Operating Systems Overview Prof. Margaret Martonosi Computer Science Department
... Change in control flow caused by something other than a jump or branch instruction Interrupt is external event ...
... Change in control flow caused by something other than a jump or branch instruction Interrupt is external event ...
Introduction to OS - EECG Toronto
... Allows programs to share CPU, memory Isolates applications from each other – What problems occur otherwise? Isolates itself from applications – What problems occur otherwise? ...
... Allows programs to share CPU, memory Isolates applications from each other – What problems occur otherwise? Isolates itself from applications – What problems occur otherwise? ...
Unix
... compilation errors will display on the screen. You should open your program in a different window to correct the mistakes. If there are no compilation errors, a file called mypgm.o will be created. This is the object code of your program. ...
... compilation errors will display on the screen. You should open your program in a different window to correct the mistakes. If there are no compilation errors, a file called mypgm.o will be created. This is the object code of your program. ...
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.