File System - UC Davis Computer Science
... Authenticate that process can access the file Create an internal file descriptor in primary memory Create an entry in a “per process” open file status table Allocate resources, e.g., buffers, to support file usage ...
... Authenticate that process can access the file Create an internal file descriptor in primary memory Create an entry in a “per process” open file status table Allocate resources, e.g., buffers, to support file usage ...
threads - Bilkent University Computer Engineering Department
... İbrahim Körpeoğlu, Bilkent University ...
... İbrahim Körpeoğlu, Bilkent University ...
Week_3 Operating system File
... A thread is a basic unit of CPU utilization; it comprises a thread ID, a program counter, a register set, and a stack. If a process has multiple threads of control, it can perform more than one task at a time. In certain situations, a single application may be required to perform several simil ...
... A thread is a basic unit of CPU utilization; it comprises a thread ID, a program counter, a register set, and a stack. If a process has multiple threads of control, it can perform more than one task at a time. In certain situations, a single application may be required to perform several simil ...
Operating Systems - Lecture #5: File Management
... Two components are common to most filenames: 1 relative filename 2 extension (called a suffix in UNIX/Linux) ...
... Two components are common to most filenames: 1 relative filename 2 extension (called a suffix in UNIX/Linux) ...
inferno logo.eps
... device to another. Not all networks are IP, not all devices are on the Internet. t Existing systems vary dramatically in the way they present their resources. Some devices may provide access through a specialized low level protocol (a digital camera say), others through remote procedure calls (RPC), ...
... device to another. Not all networks are IP, not all devices are on the Internet. t Existing systems vary dramatically in the way they present their resources. Some devices may provide access through a specialized low level protocol (a digital camera say), others through remote procedure calls (RPC), ...
Doing operating system tasks in Python
... Center for Biomedical Computing, Simula Research Laboratory ...
... Center for Biomedical Computing, Simula Research Laboratory ...
Proceedings of the General Track: 2003 USENIX Annual Technical Conference
... guess where probes would be useful ahead of time. Further, many probes are generic (e.g., timing each function call, counting the number of parallel requests to a component). Such probes can be implemented once, avoiding code replication across components. Application-specific optimizations: Applica ...
... guess where probes would be useful ahead of time. Further, many probes are generic (e.g., timing each function call, counting the number of parallel requests to a component). Such probes can be implemented once, avoiding code replication across components. Application-specific optimizations: Applica ...
an introduction to solaris
... kernel supports an environment in which multiple programs can execute simultaneously. The primary functions of the kernel can be divided into two major categories: managing the hardware by allocating its resources among the programs running on it; and supplying a set of system services for those pro ...
... kernel supports an environment in which multiple programs can execute simultaneously. The primary functions of the kernel can be divided into two major categories: managing the hardware by allocating its resources among the programs running on it; and supplying a set of system services for those pro ...
2.01 - Kangwon
... System programs provide a convenient environment for program development and execution. ...
... System programs provide a convenient environment for program development and execution. ...
UNIT-1 Operating System Concept
... of windows [3 times ] OR Explain local security policy in window. (Oct/nov-2016) Explain System Configuration utility. Write a note of different type of naming conversion of domain. Explain windows administrative tools. Or discuss any one administrative tool in detail. Write any one computer managem ...
... of windows [3 times ] OR Explain local security policy in window. (Oct/nov-2016) Explain System Configuration utility. Write a note of different type of naming conversion of domain. Explain windows administrative tools. Or discuss any one administrative tool in detail. Write any one computer managem ...
Figure 5.01
... maintain the appropriate number of kernel threads allocated to the application Scheduler activations provide upcalls - a communication mechanism from the kernel to the thread library ...
... maintain the appropriate number of kernel threads allocated to the application Scheduler activations provide upcalls - a communication mechanism from the kernel to the thread library ...
Chap. 2, Operating System Structures
... LPOVERLAPPED ovl—indicates if overlapped I/O is being used ...
... LPOVERLAPPED ovl—indicates if overlapped I/O is being used ...
lecture1422914790
... processors do not share memory or a clock. Instead, each processor has its own local memory. The processors communicate with each other by various communication lines such as high speed buses or telephone lines. Distributed systems depend on networking for their functionalities. By being able to com ...
... processors do not share memory or a clock. Instead, each processor has its own local memory. The processors communicate with each other by various communication lines such as high speed buses or telephone lines. Distributed systems depend on networking for their functionalities. By being able to com ...
lecture1423726024
... mouse and wait for immediate results. So the response time will be short. The time sharing system allows many users to share the computer simultaneously. Since each action in this system is short, only a little CPU time is needed for each user. The system switches rapidly from one user to the next s ...
... mouse and wait for immediate results. So the response time will be short. The time sharing system allows many users to share the computer simultaneously. Since each action in this system is short, only a little CPU time is needed for each user. The system switches rapidly from one user to the next s ...
Figure 5.01 - Ceng Anadolu
... Usually slightly faster to service a request with an existing thread than create a new thread ...
... Usually slightly faster to service a request with an existing thread than create a new thread ...
Multi-threaded Lisp: Challenges and Solutions
... A thread may be executing foreign code when the garbage collector is called. It may not be in a predictable state for the collector. Need a way for the collector to determine which threads were executing foreign code and which were executing Lisp code. Lisp code could have been called by foreign cod ...
... A thread may be executing foreign code when the garbage collector is called. It may not be in a predictable state for the collector. Need a way for the collector to determine which threads were executing foreign code and which were executing Lisp code. Lisp code could have been called by foreign cod ...
Chapter 3 Operating-System Structures 2
... and the operating system kernel as though they were all hardware. • A virtual machine provides an interface identical to the underlying bare hardware. • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory. CS.217 Operatin ...
... and the operating system kernel as though they were all hardware. • A virtual machine provides an interface identical to the underlying bare hardware. • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory. CS.217 Operatin ...
slides18-stm
... deciding where critical sections should begin and end. This is still a hard problem. ...
... deciding where critical sections should begin and end. This is still a hard problem. ...
Ch2-V2
... management, and other operating-system functions; a large number of functions for one level ...
... management, and other operating-system functions; a large number of functions for one level ...
David Walker
... deciding where critical sections should begin and end. This is still a hard problem. Too small: application-specific data races (Eg, may see deposit but not withdraw if transfer is not atomic). - Too large: delay progress because deny other threads access to needed resources. ...
... deciding where critical sections should begin and end. This is still a hard problem. Too small: application-specific data races (Eg, may see deposit but not withdraw if transfer is not atomic). - Too large: delay progress because deny other threads access to needed resources. ...
Computer Organisation Operating Systems
... to handle multiple interactive jobs. • TSS provides an interactive multiprogramming environment to enable multiple users simultaneously access the system through terminals. • Processor’s time is shared among multiple users. • Because of slow human reaction time, a typical user needs 1-2 second to in ...
... to handle multiple interactive jobs. • TSS provides an interactive multiprogramming environment to enable multiple users simultaneously access the system through terminals. • Processor’s time is shared among multiple users. • Because of slow human reaction time, a typical user needs 1-2 second to in ...
1.1. The UNIX Operating System
... disks, modems, printers, network cards etc.) in a safe, efficient and abstract way. For example, an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that ...
... disks, modems, printers, network cards etc.) in a safe, efficient and abstract way. For example, an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that ...
File System
... manages buffers for I/O requests Works with VM Manager to provide memory-mapped file I/O Controls the 2000 cache manager, which handles caching for the ...
... manages buffers for I/O requests Works with VM Manager to provide memory-mapped file I/O Controls the 2000 cache manager, which handles caching for the ...
No Slide Title
... manages buffers for I/O requests Works with VM Manager to provide memory-mapped file I/O Controls the 2000 cache manager, which handles caching for the ...
... manages buffers for I/O requests Works with VM Manager to provide memory-mapped file I/O Controls the 2000 cache manager, which handles caching for the ...
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.