VirtualFilesystem
... – Directories are handled by file objects. – dentry objects are path components, not dirs. ...
... – Directories are handled by file objects. – dentry objects are path components, not dirs. ...
(1) What is operating System? Explain the abstract view of the
... interface in terms of parameters and results, and each one is free to call any other one, if the latter provides some useful computation that the former needs. To construct the actual object program of the operating system, when this approach is used, one first compiles all the individual procedure ...
... interface in terms of parameters and results, and each one is free to call any other one, if the latter provides some useful computation that the former needs. To construct the actual object program of the operating system, when this approach is used, one first compiles all the individual procedure ...
Figure 5.01
... 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 of ...
... 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 of ...
Slide 1
... 041500 Time Machine is synchronization software used for backup on Macs. 041600 To repopulate a new hard disk from an incremental backup, you have to first restore a full backup. 041700 A boot disk contains a complete copy of your computer’s hard disk as it existed when the computer was new. ...
... 041500 Time Machine is synchronization software used for backup on Macs. 041600 To repopulate a new hard disk from an incremental backup, you have to first restore a full backup. 041700 A boot disk contains a complete copy of your computer’s hard disk as it existed when the computer was new. ...
CS153: Lecture 3
... Creating illusions that multiple tasks can run at the same time, even if there is only a single CPU » Also called multiprogramming » MS-DOS vs. Windows 95 (and onwards) » Analogy to human beings? ...
... Creating illusions that multiple tasks can run at the same time, even if there is only a single CPU » Also called multiprogramming » MS-DOS vs. Windows 95 (and onwards) » Analogy to human beings? ...
Operation Systems
... An important thing to understand about variable storage is the difference between the program stack and the heap. Memory in the stack is of a fixed size. Each function has its own set of variables that reside in the stack storage, which are pushed on and popped off the program stack as the program m ...
... An important thing to understand about variable storage is the difference between the program stack and the heap. Memory in the stack is of a fixed size. Each function has its own set of variables that reside in the stack storage, which are pushed on and popped off the program stack as the program m ...
Operating Systems
... Process manager uses two schedulers: • The job scheduler • The process scheduler ...
... Process manager uses two schedulers: • The job scheduler • The process scheduler ...
Shared Memory IPC
... Also introduced in System V Release 3 Allows two or more processes to share some memory segments With some control over read/write permissions Often used to implement threads packages for UNIX ...
... Also introduced in System V Release 3 Allows two or more processes to share some memory segments With some control over read/write permissions Often used to implement threads packages for UNIX ...
I/O Devices - Computer Sciences User Pages
... really make sense for slow devices. Otherwise, the cost of interrupt handling and context switching may outweigh the benefits interrupts provide. There are also cases where a flood of interrupts may overload a system and lead it to livelock [MR96]; in such cases, polling provides more control to the ...
... really make sense for slow devices. Otherwise, the cost of interrupt handling and context switching may outweigh the benefits interrupts provide. There are also cases where a flood of interrupts may overload a system and lead it to livelock [MR96]; in such cases, polling provides more control to the ...
Introduction to Programming Methodology Notes
... We shall discuss these concepts in some detail in this section. Objects Objects are the basic run time entities in an object oriented system. They may represent a person, a place, a bank account, a table of data or any item that the program has to handle. They may also represent user-defined data su ...
... We shall discuss these concepts in some detail in this section. Objects Objects are the basic run time entities in an object oriented system. They may represent a person, a place, a bank account, a table of data or any item that the program has to handle. They may also represent user-defined data su ...
ppt
... Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system ...
... Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system ...
3. Processes
... The task's share of the CPU time expressed as a percentage of total CPU time. The task's share of the physical memory. The total amount of virtual memory used by the task in kilobytes. The total amount of physical memory used by the task in kilobytes. start time of task. The process state. ...
... The task's share of the CPU time expressed as a percentage of total CPU time. The task's share of the physical memory. The total amount of virtual memory used by the task in kilobytes. The total amount of physical memory used by the task in kilobytes. start time of task. The process state. ...
Chapter 9: File-System Interface
... Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system Program / programmer ...
... Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system Program / programmer ...
Subject : OPS - 12178 Chapter 4 Process Scheduling Scheduling
... Basic Concepts: - In a single-processor system, only one process can run at a time; any others must wait until the CPU is free and can be rescheduled. The objective of multiprogramming is to have some process running at all times, to maximize CPU utilization. The idea is relatively simple. A process ...
... Basic Concepts: - In a single-processor system, only one process can run at a time; any others must wait until the CPU is free and can be rescheduled. The objective of multiprogramming is to have some process running at all times, to maximize CPU utilization. The idea is relatively simple. A process ...
Proceedings - School of Engineering and Applied Science
... should be integral to the design of the OS, rather than providing capabilities to design hypervisors for hosting separate unrelated guest OSes. While virtualization provides the basis for safe isolation of system components, proper time management is necessary for real-time guarantees to be met. Mul ...
... should be integral to the design of the OS, rather than providing capabilities to design hypervisors for hosting separate unrelated guest OSes. While virtualization provides the basis for safe isolation of system components, proper time management is necessary for real-time guarantees to be met. Mul ...
Introduction to Operating Systems
... Definition – File • A (potentially) large amount of information or data that lives a (potentially) very long time • Often much larger than the memory of the computer • Often much longer than any computation • Sometimes longer than life of machine itself ...
... Definition – File • A (potentially) large amount of information or data that lives a (potentially) very long time • Often much larger than the memory of the computer • Often much longer than any computation • Sometimes longer than life of machine itself ...
2.01 - Czech Technical University in Prague
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
Chapter 2: Operating
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Slide 1
... A file format refers to the organization and layout of data that is stored in a file The format of a file usually includes a header, data, and possibly an end-of-file marker A file header is a section of data at the beginning of a file that contains information about a file ...
... A file format refers to the organization and layout of data that is stored in a file The format of a file usually includes a header, data, and possibly an end-of-file marker A file header is a section of data at the beginning of a file that contains information about a file ...
Last Class: Threads and Scheduling Today: More on Scheduling
... Scheduling Policies ! Ideally, choose a CPU scheduler that optimizes all criteria simultaneously (utilization, throughput,..), but this is not generally possible Instead, choose a scheduling algorithm based on its ability to satisfy a policy • Minimize average response time - provide output to the ...
... Scheduling Policies ! Ideally, choose a CPU scheduler that optimizes all criteria simultaneously (utilization, throughput,..), but this is not generally possible Instead, choose a scheduling algorithm based on its ability to satisfy a policy • Minimize average response time - provide output to the ...
ppt
... 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 management. ...
... 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 management. ...