Operating Systems (Notes to prepare in 1 night before Exam)
... 4. Transactional File Systems: This a special kind of file system in that it logs events or transactions to files. Each operation that you do may involve changes to a number of different files and disk structures. It is important that they all be executed at the same time. For example, file system u ...
... 4. Transactional File Systems: This a special kind of file system in that it logs events or transactions to files. Each operation that you do may involve changes to a number of different files and disk structures. It is important that they all be executed at the same time. For example, file system u ...
第二章 进程与调度 （Processes and Scheduling）
... because a higher priority process on the blocked,suspend queue has just become unblocked, the OS could move the running process directly to the (ready, suspend)queue and free some main memory Various->exit: When a process be terminated by it’s parent, the process can be in any state when be ...
... because a higher priority process on the blocked,suspend queue has just become unblocked, the OS could move the running process directly to the (ready, suspend)queue and free some main memory Various->exit: When a process be terminated by it’s parent, the process can be in any state when be ...
Linux-Spr-2001-sect-1-group
... • Mode that allows access to all kernel functions • Can run privileged instructions ...
... • Mode that allows access to all kernel functions • Can run privileged instructions ...
Module 4: Processes
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
Introduction to Distributed Systems
... Introduction to Distributed Systems 1. What is a Distributed System? A distributed system is a collection of independent computers that appears to the users of the system as a single computer. This definition has two aspects. The first one deals with hardware: the machines are autonomous. The secon ...
... Introduction to Distributed Systems 1. What is a Distributed System? A distributed system is a collection of independent computers that appears to the users of the system as a single computer. This definition has two aspects. The first one deals with hardware: the machines are autonomous. The secon ...
Fundamental Concepts of Operating Systems
... The state of a process includes the value of the program counter (indicating the address of the next instruction to be executed), the value of the generalpurpose registers, its stack for method invocation, its open files, and its code. During the interrupt-handling phase, hardware will save the valu ...
... The state of a process includes the value of the program counter (indicating the address of the next instruction to be executed), the value of the generalpurpose registers, its stack for method invocation, its open files, and its code. During the interrupt-handling phase, hardware will save the valu ...
Slides10_30
... Virtual Memory • We do not need all of a process in memory for it to run - We can swap in pages as required • So - we can now run processes that are bigger than total memory available! ...
... Virtual Memory • We do not need all of a process in memory for it to run - We can swap in pages as required • So - we can now run processes that are bigger than total memory available! ...
RAJALAKSHMI ENGINEERING COLLEGE
... A computer system has many resources - hardware & software that may be required to solve a problem, like CPU time, memory space, file-storage space, I/O devices & so on. The OS acts as a manager for these resources so it is viewed as a resource allocator.The OS is viewed as a control program because ...
... A computer system has many resources - hardware & software that may be required to solve a problem, like CPU time, memory space, file-storage space, I/O devices & so on. The OS acts as a manager for these resources so it is viewed as a resource allocator.The OS is viewed as a control program because ...
Chapter 3: Operating Systems
... Scheduler: Adds new processes to the process table and removes completed processes from the process table Dispatcher: Controls the allocation of time slices to the processes in the process table The end of a time slice is signaled by an ...
... Scheduler: Adds new processes to the process table and removes completed processes from the process table Dispatcher: Controls the allocation of time slices to the processes in the process table The end of a time slice is signaled by an ...
Cooperating Processes
... block. Also, the scheduling control by the thread runtime system may cause some threads to gain exclusive access to the CPU and prevent other threads from obtaining the CPU. Finally, access to multiple processors is not guaranteed since the operating system is not aware of existence of these types o ...
... block. Also, the scheduling control by the thread runtime system may cause some threads to gain exclusive access to the CPU and prevent other threads from obtaining the CPU. Finally, access to multiple processors is not guaranteed since the operating system is not aware of existence of these types o ...
Chapter 10 Multiprocessor, Multicore and Real-Time
... • synchronization blocking may be reduced, less process switching may be necessary, and performance will increase • scheduling overhead may be reduced ...
... • synchronization blocking may be reduced, less process switching may be necessary, and performance will increase • scheduling overhead may be reduced ...
Processes - Computer and Information Science
... state of the old process and load the saved state for the new process Context-switch time is overhead; the system does no useful work ...
... state of the old process and load the saved state for the new process Context-switch time is overhead; the system does no useful work ...
1.1. OS Introduction Operating System Types
... impression that the entire computer system is dedicated to her use, even though it is being shared among many users. A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared computer. Each user has at least one separate progra ...
... impression that the entire computer system is dedicated to her use, even though it is being shared among many users. A time-shared operating system uses CPU scheduling and multiprogramming to provide each user with a small portion of a time-shared computer. Each user has at least one separate progra ...
QNX Corporate Sales Presentation
... – if they are not, an unknown amount of time can be spent in the kernel performing an operation on behalf of a user process – can cause real-time process to miss deadline All kernels have some window (or multiple windows) of time where pre-emption cannot occur Some operating systems attempt to p ...
... – if they are not, an unknown amount of time can be spent in the kernel performing an operation on behalf of a user process – can cause real-time process to miss deadline All kernels have some window (or multiple windows) of time where pre-emption cannot occur Some operating systems attempt to p ...
Chapter 04 - Regis University: Academic Web Server for Faculty
... ◦ Multiple permissions may exist to same object for a single user. ◦ The directory approach is considered too simple for most object protection situations. ...
... ◦ Multiple permissions may exist to same object for a single user. ◦ The directory approach is considered too simple for most object protection situations. ...
operating system - GH Raisoni Polytechnic, Nagpur
... Common output devices were line printers, tape drives, and card punches. Users did not interact directly with the computer systems, but he prepared a job (comprising of the program, the data, & some control information). ...
... Common output devices were line printers, tape drives, and card punches. Users did not interact directly with the computer systems, but he prepared a job (comprising of the program, the data, & some control information). ...
Commercial Real-Time Operating Systems – An
... Backward compatibility to previous verison features for exception handling and and template support ...
... Backward compatibility to previous verison features for exception handling and and template support ...
PowerPoint - School of Computer Science
... Logic address: Expressed as a location relative to the beginning of the program. Instructions in the program only contains logical addresses. Physical Address: Actual location in the memory. When executing a program, the logical addresses are automatically converted into physical addresses ...
... Logic address: Expressed as a location relative to the beginning of the program. Instructions in the program only contains logical addresses. Physical Address: Actual location in the memory. When executing a program, the logical addresses are automatically converted into physical addresses ...
Lecture3-os-support
... * setbackdq() keeps runqs balanced such that the difference in length * between the chosen runq and the next one is no more than RUNQ_MAX_DIFF. ...
... * setbackdq() keeps runqs balanced such that the difference in length * between the chosen runq and the next one is no more than RUNQ_MAX_DIFF. ...
08 Operating System Support
... —Memory split into two —One for Operating System (monitor) —One for currently executing program ...
... —Memory split into two —One for Operating System (monitor) —One for currently executing program ...
UNICOS, FORTRAN 90, NQS
... • Man pages: Online documentation • User commands perform functions such as: ...
... • Man pages: Online documentation • User commands perform functions such as: ...