CHAPTER 1
... Some Java Characteristics • Case-sensitive • Free-form layout • A Java program must have one and only one method, called main, which is the program entrance • Two ways for comments – // -- comment a single line – /* ... */ -- comment a paragraph ...
... Some Java Characteristics • Case-sensitive • Free-form layout • A Java program must have one and only one method, called main, which is the program entrance • Two ways for comments – // -- comment a single line – /* ... */ -- comment a paragraph ...
History of Operating Systems
... “turn around” time was hours to days - even to find a syntax error! Programmers saw this as cumbersome. However, system utilization increased dramatically. • No programmer set up or “thinking” time. • As one job terminated, the computer would load the next job in the batch and begin execution. Since ...
... “turn around” time was hours to days - even to find a syntax error! Programmers saw this as cumbersome. However, system utilization increased dramatically. • No programmer set up or “thinking” time. • As one job terminated, the computer would load the next job in the batch and begin execution. Since ...
OPERATING SYSTEMS:
... Spooling “Simultaneous Peripheral Operation On Line”: whenever a running job finished, O/S load a new job from disk to the now-empty partition and run it Timesharing: each user has an on-line terminal where CPU times is dedicated only to the jobs that need service “MULTICS” ...
... Spooling “Simultaneous Peripheral Operation On Line”: whenever a running job finished, O/S load a new job from disk to the now-empty partition and run it Timesharing: each user has an on-line terminal where CPU times is dedicated only to the jobs that need service “MULTICS” ...
Slides
... • Accounting - To keep track of which users use how much and what kinds of computer resources • Protection and security – • Protection - ensure that all access to system resources is controlled • Security – protect system from outside users ...
... • Accounting - To keep track of which users use how much and what kinds of computer resources • Protection and security – • Protection - ensure that all access to system resources is controlled • Security – protect system from outside users ...
What is an operating system?
... System Calls • Set of extended instructions provided by the operating system • System calls provide an interface between user program and operating system • Applied to various software objects like processes and files • Invoked by user programs to communicate with the kernel and request services • ...
... System Calls • Set of extended instructions provided by the operating system • System calls provide an interface between user program and operating system • Applied to various software objects like processes and files • Invoked by user programs to communicate with the kernel and request services • ...
Computer Science A, 1
... Course plan • Introduction to programming • Basic concepts of typical programming languages. • Tools: compiler, editor, integrated editor, libraries. • A bit about software engineering – methods used in constructing programs. • A bit about graphics ...
... Course plan • Introduction to programming • Basic concepts of typical programming languages. • Tools: compiler, editor, integrated editor, libraries. • A bit about software engineering – methods used in constructing programs. • A bit about graphics ...
Pathway Introduction: Information Technology
... • OS manages what process(es) are running – Programs take turns on processor • Run until time limit or need to wait • OS handles all hardware events ...
... • OS manages what process(es) are running – Programs take turns on processor • Run until time limit or need to wait • OS handles all hardware events ...
Chapter 1: Introduction - CS 241 (c++)
... the end of main without encountering a return statement, it’s assumed that the program terminated successfully—exactly as when the last statement in main is a return statement with the ...
... the end of main without encountering a return statement, it’s assumed that the program terminated successfully—exactly as when the last statement in main is a return statement with the ...
Systems Software - Shawlands Academy
... The OS is stored on hard disc and loaded into RAM when the computer starts up. Some computers store their OS in ROM so that it cannot be erased by accident. The operating system controls and monitors the operation of the computer system. The filing system is part of the OS and it controls the loadin ...
... The OS is stored on hard disc and loaded into RAM when the computer starts up. Some computers store their OS in ROM so that it cannot be erased by accident. The operating system controls and monitors the operation of the computer system. The filing system is part of the OS and it controls the loadin ...
lecture notes
... may set a timer to ensure a process does not run beyond its allotted time To avoid infinite loops, memory ...
... may set a timer to ensure a process does not run beyond its allotted time To avoid infinite loops, memory ...
Tutorial: What Software Lawyers Need to Know about Software
... Enter your first name: Josephine Enter your last name: Jaworski Hello, Josephine Jaworski Press any key to continue... ...
... Enter your first name: Josephine Enter your last name: Jaworski Hello, Josephine Jaworski Press any key to continue... ...
Chapter 2 Operating System Overview
... • The sequence in which the programs are executed depends on their relative priority (see scheduler) and whether they are waiting for I/O • After an interrupt handler completes, control may not return to the program that was executing at the time of the interrupt ...
... • The sequence in which the programs are executed depends on their relative priority (see scheduler) and whether they are waiting for I/O • After an interrupt handler completes, control may not return to the program that was executing at the time of the interrupt ...
Cabrillo College LIBRARY COMPUTER SYSTEMS TECHNICIAN DEFINITION
... application interfaces including CGI application creation using PER Create, maintain and troubleshoot the Webbased interface for delivery of selected library applications and library Email services Perform desktop, student application, and Internet software analysis for introduction of new library ...
... application interfaces including CGI application creation using PER Create, maintain and troubleshoot the Webbased interface for delivery of selected library applications and library Email services Perform desktop, student application, and Internet software analysis for introduction of new library ...
OS/2 API
... allocating process virtual address spaces and for setting up the required hardware structures to enable processes to be protected from one another and from the system. •OS/2 provides functions for object allocation, deallocation, and sharing. ...
... allocating process virtual address spaces and for setting up the required hardware structures to enable processes to be protected from one another and from the system. •OS/2 provides functions for object allocation, deallocation, and sharing. ...
1. Which situation is suitable to use message passing instead of
... model is the fact that it is, by nature, a polling interface. While this can make for extremely efficient communication under some circumstances, it can have a negative impact on synchronization operations. 2. What is “system calls?” Please specify the functions and the purposes of a system call in ...
... model is the fact that it is, by nature, a polling interface. While this can make for extremely efficient communication under some circumstances, it can have a negative impact on synchronization operations. 2. What is “system calls?” Please specify the functions and the purposes of a system call in ...
L02_OperatingSystemEvolution
... CPU, disk and network resources are shared by having applications take short turns at using the resources Memory is shared by splitting the memory space among multiple applications Printers can only be used by a single application until it has finished using it ...
... CPU, disk and network resources are shared by having applications take short turns at using the resources Memory is shared by splitting the memory space among multiple applications Printers can only be used by a single application until it has finished using it ...
Programlama ve Nesneler
... – The interpreters are platform specific, not the programs themselves – Each run requires a conversion and therefore is slower ...
... – The interpreters are platform specific, not the programs themselves – Each run requires a conversion and therefore is slower ...
JAVA vs C++ Programming Language Comparison
... • Run-time representation • Needs recompile if for classes makes it libraries are updated possible to dynamically link classes into a running system • Loads classes as needed, even from across networks ...
... • Run-time representation • Needs recompile if for classes makes it libraries are updated possible to dynamically link classes into a running system • Loads classes as needed, even from across networks ...
LIU_AAPT_2014_ch2 - theRepository at St. Cloud State
... you will learn during the workshop. C/C++ is used in Arduino. It is versatile and powerful. Arduino IDE made it easy by hiding some details. You type your program in an editor (IDE),compile then upload to Arduino or OSPL that runs the program. Some math expressions need transcription and explicit mu ...
... you will learn during the workshop. C/C++ is used in Arduino. It is versatile and powerful. Arduino IDE made it easy by hiding some details. You type your program in an editor (IDE),compile then upload to Arduino or OSPL that runs the program. Some math expressions need transcription and explicit mu ...
ch6_programming_concepts_3- Connor Lee
... What are the advantages of this type of programming? It’s easier to find bugs in the program Software development is faster when several programmers can work simultaneously on different modules A useful module can be reused in other programs. This saves time and effort. A program often needs ...
... What are the advantages of this type of programming? It’s easier to find bugs in the program Software development is faster when several programmers can work simultaneously on different modules A useful module can be reused in other programs. This saves time and effort. A program often needs ...
Prog4IntLecture2Java
... • Javac will converty the .java files into class files, but the code crashes somewhere. • May crash before the code “works” at all, or it may crash after running for a while. ...
... • Javac will converty the .java files into class files, but the code crashes somewhere. • May crash before the code “works” at all, or it may crash after running for a while. ...
Chapter 10
... step) for references to external library function calls When an external function call is found, the link editor searches for the corresponding executable code that implements the function ...
... step) for references to external library function calls When an external function call is found, the link editor searches for the corresponding executable code that implements the function ...
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.