2.01 - Czech Technical University in Prague
... 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 ...
Advanced Operating Systems
... Instead, the undergraduate operating systems course that is an appropriate prerequisite for this material covers the purposes of an operating system, the variety of designs possible, and the traditional algorithms used in an operating system implementation. Two topics covered in some depth in that c ...
... Instead, the undergraduate operating systems course that is an appropriate prerequisite for this material covers the purposes of an operating system, the variety of designs possible, and the traditional algorithms used in an operating system implementation. Two topics covered in some depth in that c ...
C#: Kames Moore, Otamere Osar
... Contrary to popular belief, C# is not simply a clone of or replacement for Java According to Anders Hejlsberg, Microsoft’s Chief Architect, C# is a derivation of C++, C, Java, Modula 2, and Smalltalk C# Presentation, Spring 2003 ...
... Contrary to popular belief, C# is not simply a clone of or replacement for Java According to Anders Hejlsberg, Microsoft’s Chief Architect, C# is a derivation of C++, C, Java, Modula 2, and Smalltalk C# Presentation, Spring 2003 ...
Module 3: Operating
... 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 The operating system is responsible for the following activities in connection with disk management: Free space management Storage allocation ...
... 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 The operating system is responsible for the following activities in connection with disk management: Free space management Storage allocation ...
第六章文件系统
... file is restored only one time. UNIX files may contain holes. The blocks in between are not part of the file and should not be dumped and not be restored. Special files, named files, and the like should never be ...
... file is restored only one time. UNIX files may contain holes. The blocks in between are not part of the file and should not be dumped and not be restored. Special files, named files, and the like should never be ...
Characteristics of Java
... Java’s performance is sometimes criticized. The execution of the bytecode is never as fast as it would be with a compiled language, such as C++. Because Java is interpreted, the bytecode is not directly executed by the system, but is run through the interpreter. However, its speed is more than adequ ...
... Java’s performance is sometimes criticized. The execution of the bytecode is never as fast as it would be with a compiled language, such as C++. Because Java is interpreted, the bytecode is not directly executed by the system, but is run through the interpreter. However, its speed is more than adequ ...
Threads
... that forms the basis of multithreaded computer systems To discuss the APIs for the Pthreads, Win32, and Java thread libraries To examine issues related to multithreaded programming ...
... that forms the basis of multithreaded computer systems To discuss the APIs for the Pthreads, Win32, and Java thread libraries To examine issues related to multithreaded programming ...
Lecture 15 - Department of Math and Computer Science
... associates named environment variables with arbitrary textual values ...
... associates named environment variables with arbitrary textual values ...
What is the use of java? - Entrance
... debugging, and documenting your applications. The main tools used are the Javac compiler, the java launcher, and the javadoc documentation tool. Application Programming Interface (API): The API provides the core functionality of the Java programming language. It gives a wide collection of useful cla ...
... debugging, and documenting your applications. The main tools used are the Javac compiler, the java launcher, and the javadoc documentation tool. Application Programming Interface (API): The API provides the core functionality of the Java programming language. It gives a wide collection of useful cla ...
2.01 - SEJONG
... 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 Program Interface ...
... 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 Program Interface ...
Operating System Services
... One set of operating-system services provides functions that are helpful to the user (Cont.): File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission manageme ...
... One set of operating-system services provides functions that are helpful to the user (Cont.): File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission manageme ...
lecture2
... additional software. Systems generally first distinguish among users, to determine who can do what User identities (user IDs--security IDs in Windows) include name and associated number, one per user User ID then associated with all files, processes of that user to ...
... additional software. Systems generally first distinguish among users, to determine who can do what User identities (user IDs--security IDs in Windows) include name and associated number, one per user User ID then associated with all files, processes of that user to ...
ppt - Zoo - Yale University
... These features can be very useful and save time. • Example features are GUI compile, GUI execution, code completion, and syntax highlighting. ...
... These features can be very useful and save time. • Example features are GUI compile, GUI execution, code completion, and syntax highlighting. ...
ch22
... Executive — Local Procedure Call Facility The LPC passes requests and results between client and ...
... Executive — Local Procedure Call Facility The LPC passes requests and results between client and ...
No Slide Title
... and manages buffers for I/O requests. Works with VM Manager to provide memory-mapped file ...
... and manages buffers for I/O requests. Works with VM Manager to provide memory-mapped file ...
OPERATING SYSTEM CONCEPTS
... example, rather than distinguishing between just user and kernel mode, you could distinguish between different types of user mode. Perhaps users belonging to the same group could execute each other’s code. The machine would go into a specified mode when one of these users was running code. When the ...
... example, rather than distinguishing between just user and kernel mode, you could distinguish between different types of user mode. Perhaps users belonging to the same group could execute each other’s code. The machine would go into a specified mode when one of these users was running code. When the ...
ch19
... recovered after a crash, just that the file system data structures (the metadata files) are undamaged and reflect some consistent state prior to the crash. The log is stored in the third metadata file at the beginning of the ...
... recovered after a crash, just that the file system data structures (the metadata files) are undamaged and reflect some consistent state prior to the crash. The log is stored in the third metadata file at the beginning of the ...
- TestbankU
... Ans: The code can be written faster, is more compact, and is easier to understand and debug. In addition, improvements in compiler technology will improve the generated code for the entire operating system by simple recompilation. Finally, an operating system is far easier to port — to move to some ...
... Ans: The code can be written faster, is more compact, and is easier to understand and debug. In addition, improvements in compiler technology will improve the generated code for the entire operating system by simple recompilation. Finally, an operating system is far easier to port — to move to some ...
Operating-System Structures
... Protection involves ensuring that all access to system resources is controlled Security of the system from outsiders requires user authentication, extends to defending external I/O devices ...
... Protection involves ensuring that all access to system resources is controlled Security of the system from outsiders requires user authentication, extends to defending external I/O devices ...
System and Process Virtualization
... – Translate between equivalent facilities Instruction Set Architecture? Library? System Calls? ...
... – Translate between equivalent facilities Instruction Set Architecture? Library? System Calls? ...
Lecture 3
... user space to kernel space. This method has been using in all following versions of Windows – 2000, XP, Vista) ...
... user space to kernel space. This method has been using in all following versions of Windows – 2000, XP, Vista) ...
Windows 95/98/NT (Introduction)
... Win32-based programs do not need to yield to share resources. This is because Win32based applications (called processes) use multithreading, which provides for multiprocessing. A thread in a program is a unit of code that can get a time slice from the operating system to run concurrently with other ...
... Win32-based programs do not need to yield to share resources. This is because Win32based applications (called processes) use multithreading, which provides for multiprocessing. A thread in a program is a unit of code that can get a time slice from the operating system to run concurrently with other ...
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.