Streams and File I/O
... therefor any catch block that catches IOExceptions also catches FileNotFoundExceptions errors can be isolated better if they have different messages so create different catch blocks for each exception type put the more specific one first (the derived one) so it catches specifically file-not-found ex ...
... therefor any catch block that catches IOExceptions also catches FileNotFoundExceptions errors can be isolated better if they have different messages so create different catch blocks for each exception type put the more specific one first (the derived one) so it catches specifically file-not-found ex ...
Ch-4_3431
... Processes can use and reuse the threads in their pool, but cannot create more Extra startup overhead, but better runtime performance if many threads started/stopped (e.g., web browsers) Pool size can be dynamic, with changes based on number of processes, CPU usage, free memory, etc. ...
... Processes can use and reuse the threads in their pool, but cannot create more Extra startup overhead, but better runtime performance if many threads started/stopped (e.g., web browsers) Pool size can be dynamic, with changes based on number of processes, CPU usage, free memory, etc. ...
No Slide Title
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values. ...
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values. ...
The Linux System
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values ...
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values ...
Chapter 2: System Structures
... 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 ...
... 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 ...
The Linux System 21.2 Silberschatz, Galvin and Gagne ©2009
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values. ...
... The environment vector is a list of “NAME=VALUE” pairs that associates named environment variables with arbitrary textual values. ...
2013
... Write C program using recursion function, Factorial, Prime number, Fibonacci series, GCD, Palindrome, Reverse string, LCM, Matrix multiplication, Sum of digits, Find power, Reverse number, Sum of n numbers, Binary search, Decimal to binary, Largest element in an array. Write C program which are work ...
... Write C program using recursion function, Factorial, Prime number, Fibonacci series, GCD, Palindrome, Reverse string, LCM, Matrix multiplication, Sum of digits, Find power, Reverse number, Sum of n numbers, Binary search, Decimal to binary, Largest element in an array. Write C program which are work ...
Chapter 10 File System Interface
... 3) Read – read data from file; usually OpSys maintains readpointer (rp) and call reads from current rp. Call specifies file ID, memory buffer to put data. Sometimes rp and wp are a single perprocess pointer. 4) Reposition within file (seek) – move the rp or wp to a specified location within fil ...
... 3) Read – read data from file; usually OpSys maintains readpointer (rp) and call reads from current rp. Call specifies file ID, memory buffer to put data. Sometimes rp and wp are a single perprocess pointer. 4) Reposition within file (seek) – move the rp or wp to a specified location within fil ...
VirtualFilesystem
... • Current working directory – Default location for file commands. – Relative pathnames are relative to CWD. ...
... • Current working directory – Default location for file commands. – Relative pathnames are relative to CWD. ...
Lecture 1: Course Introduction and Overview
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
Chapter 7 Deadlocks
... • The purpose of file management is to identify the concepts of file management and how to use it effectively. • Data should be organized in some convenient and efficient manner. In particular, users should be able to: – Put data into files – Find and use files that have previously been created ...
... • The purpose of file management is to identify the concepts of file management and how to use it effectively. • Data should be organized in some convenient and efficient manner. In particular, users should be able to: – Put data into files – Find and use files that have previously been created ...
2. Operating Systems
... The virtual- machine concept provides complete protection of system resources since each virtual machine is isolated from all other virtual machines. This isolation, however, permits no direct sharing of resources. A virtual- machine system is a perfect vehicle for operating-systems research and dev ...
... The virtual- machine concept provides complete protection of system resources since each virtual machine is isolated from all other virtual machines. This isolation, however, permits no direct sharing of resources. A virtual- machine system is a perfect vehicle for operating-systems research and dev ...
ppt
... System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
... System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
Programming in Java - UCL Computer Science
... Instances Instances of of derived derived types types handled handled by by reference reference •• primitive primitive types types handled handled by by value. value. ...
... Instances Instances of of derived derived types types handled handled by by reference reference •• primitive primitive types types handled handled by by value. value. ...
Sistemas Operativos
... • New category of devices to manage web traffic among similar servers: load balancers • Use of operating systems like Windows 95, clientside, have evolved into Linux and Windows XP, which can be clients and servers Sistemas Operativos ...
... • New category of devices to manage web traffic among similar servers: load balancers • Use of operating systems like Windows 95, clientside, have evolved into Linux and Windows XP, which can be clients and servers Sistemas Operativos ...
Factored Operating Systems (fos)
... The traditional manner to further scale operating system performance has been to successively create finer-grain locks thus reducing the probability that more than one thread is concurrently accessing locked data. This method attempts to increase the concurrency available in the kernel. Adding locks ...
... The traditional manner to further scale operating system performance has been to successively create finer-grain locks thus reducing the probability that more than one thread is concurrently accessing locked data. This method attempts to increase the concurrency available in the kernel. Adding locks ...
Operating Systems
... Magnetic disks provide bulk of secondary storage of modern computers – Drives rotate at 60 to 200 times per second – Transfer rate is rate at which data flow between drive and computer – Positioning time (random-access time) is time to move disk arm to desired cylinder (seek time) and time for desir ...
... Magnetic disks provide bulk of secondary storage of modern computers – Drives rotate at 60 to 200 times per second – Transfer rate is rate at which data flow between drive and computer – Positioning time (random-access time) is time to move disk arm to desired cylinder (seek time) and time for desir ...
Brief Introduction of Bioinformatics
... contain other directories as well as regular files, which are the "leaves" of the tree. Any element of the tree can be references by a path name; an absolute path name starts with the character / (identifying the root directory, which contains all other directories and files), then every child direc ...
... contain other directories as well as regular files, which are the "leaves" of the tree. Any element of the tree can be references by a path name; an absolute path name starts with the character / (identifying the root directory, which contains all other directories and files), then every child direc ...
Operating System Tutorial
... All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We s ...
... All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We s ...
General-purpose Process Migration
... migration mechanisms have been used to load balance processors in a distributed system and approaches for supporting them transparent to the application has required extensive kernel support. However, despite some isolated situations, preemptive load balancing has been found quite unnecessary in mos ...
... migration mechanisms have been used to load balance processors in a distributed system and approaches for supporting them transparent to the application has required extensive kernel support. However, despite some isolated situations, preemptive load balancing has been found quite unnecessary in mos ...
Files and File Systems • files: persistent, named data objects – data
... Directories and File Names • A directory maps file names (strings) to i-numbers – an i-number is a unique (within a file system) identifier for a file or directory – given an i-number, the file system can file the data and meta-data the file • Directories provide a way for applications to group rela ...
... Directories and File Names • A directory maps file names (strings) to i-numbers – an i-number is a unique (within a file system) identifier for a file or directory – given an i-number, the file system can file the data and meta-data the file • Directories provide a way for applications to group rela ...
Savitch Java Ch. 9 - University of Scranton: Computing Sciences Dept.
... File I/O done as described here might throw an IOException You should catch the exception in a catch block that at least prints an error message and ends the program FileNotFoundException is derived from IOException » therefor any catch block that catches IOExceptions also catches FileNotFoundExcept ...
... File I/O done as described here might throw an IOException You should catch the exception in a catch block that at least prints an error message and ends the program FileNotFoundException is derived from IOException » therefor any catch block that catches IOExceptions also catches FileNotFoundExcept ...
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.