ICS 143 - Introduction to Operating Systems
... Separate user from computer User submits card deck cards put on tape tape processed by operator output written to tape tape printed on printer ...
... Separate user from computer User submits card deck cards put on tape tape processed by operator output written to tape tape printed on printer ...
lect8_9 - Computer and Information Sciences
... • Mode switch not required • Scheduling algorithm is user selected ...
... • Mode switch not required • Scheduling algorithm is user selected ...
Lecture 12
... • The open file descriptor limits access to what was checked for • But if the access permissions change while the file is open, access is NOT revoked • Sometimes possible to keep files open for a long, long time • So if user once had access to a file, may be hard to ever push him out again ...
... • The open file descriptor limits access to what was checked for • But if the access permissions change while the file is open, access is NOT revoked • Sometimes possible to keep files open for a long, long time • So if user once had access to a file, may be hard to ever push him out again ...
The Essence of UNIX and Linux
... – For example, type tcsh, bash, or ash – Work in that shell until you: • Log in again • Type another shell name on the command line ...
... – For example, type tcsh, bash, or ash – Work in that shell until you: • Log in again • Type another shell name on the command line ...
ppt
... Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in the process will not crash the OS. > A bug in user m ...
... Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in the process will not crash the OS. > A bug in user m ...
Slides - CSE, IIT Bombay
... * The OS implements a virtual device as follows: When a program performs an operation on a virtual device, the operation may be actually performed on some real resource * Example: virtual printer When a program ‘prints’ on a virtual printer, the data is actually stored in memory; printing takes ...
... * The OS implements a virtual device as follows: When a program performs an operation on a virtual device, the operation may be actually performed on some real resource * Example: virtual printer When a program ‘prints’ on a virtual printer, the data is actually stored in memory; printing takes ...
CS 571 Operating Systems - GMU Computer Science
... • Stack Pointer (SP): points to the top of the current stack in memory. The stack contains one frame for each procedure that has been entered but not yet exited.! • Program Status Word (PSW): contains the condition code bits and various other control bits. ! When time multiplexing the CPU, the ...
... • Stack Pointer (SP): points to the top of the current stack in memory. The stack contains one frame for each procedure that has been entered but not yet exited.! • Program Status Word (PSW): contains the condition code bits and various other control bits. ! When time multiplexing the CPU, the ...
Operating System Structures
... reserved by Wiley. These lecture notes should only be used for internal teaching purposes at the Linköping University. Christoph Kessler, IDA, Linköpings universitet. ...
... reserved by Wiley. These lecture notes should only be used for internal teaching purposes at the Linköping University. Christoph Kessler, IDA, Linköpings universitet. ...
Virtual Machines
... • Consolidate many services into a fewer number of machines when workload is low, reducing costs • Conversely, as demand for a particular service increases, we can shift more virtual machines to run that service • We can build a data center with fewer total resources, since resources are used as nee ...
... • Consolidate many services into a fewer number of machines when workload is low, reducing costs • Conversely, as demand for a particular service increases, we can shift more virtual machines to run that service • We can build a data center with fewer total resources, since resources are used as nee ...
Introduction to Programming Methodology Notes
... place, a bank account, a table of data or any item that the program has to handle. They may also represent user-defined data such as vectors, time and lists. Programming problem is analyzed in terms of objects and the nature of communication between them. Program objects should be chosen such that t ...
... place, a bank account, a table of data or any item that the program has to handle. They may also represent user-defined data such as vectors, time and lists. Programming problem is analyzed in terms of objects and the nature of communication between them. Program objects should be chosen such that t ...
Chapter 2: Operating-System Structures
... concurrently, resources must be allocated to each of them" Many types of resources and strategies - Some (e.g., CPU cycles, main memory, and file storage) may have special allocation code, others (e.g., I/O devices) may have general request and release code" Accounting - To keep track of which us ...
... concurrently, resources must be allocated to each of them" Many types of resources and strategies - Some (e.g., CPU cycles, main memory, and file storage) may have special allocation code, others (e.g., I/O devices) may have general request and release code" Accounting - To keep track of which us ...
Lecture 5
... Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. Error detection – ensure correct computing by detecting errors in the CPU and memory hardware, in I/O ...
... Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing. Error detection – ensure correct computing by detecting errors in the CPU and memory hardware, in I/O ...
Lecture Notes
... • Design/implement a simplified process and resource manager • Required functionalities: – process: create/destroy – resource: request/release – time-out interrupt – multi-unit resources (5.1. page 490 of textbook) – extensive error checking ...
... • Design/implement a simplified process and resource manager • Required functionalities: – process: create/destroy – resource: request/release – time-out interrupt – multi-unit resources (5.1. page 490 of textbook) – extensive error checking ...
FREE Sample Here
... NTFS has been supported in Windows Server systems from when Windows NT Server was introduced in the early 1990s to Windows 2000 Server and Windows Server 2003. Windows Server 2008 also uses NTFS, which includes the following traditional NTFS features: * Local security through file and folder permiss ...
... NTFS has been supported in Windows Server systems from when Windows NT Server was introduced in the early 1990s to Windows 2000 Server and Windows Server 2003. Windows Server 2008 also uses NTFS, which includes the following traditional NTFS features: * Local security through file and folder permiss ...
2.01 - Czech Technical University in Prague
... Operating System Concepts – 7th Edition, Jan 14, 2005 ...
... Operating System Concepts – 7th Edition, Jan 14, 2005 ...
Quick History of Open Source
... Unix History Continued… • Ken Thomson created a new language ‘B’and rewrote the whole Unix code in this high level language • Dennis Ritchie shifted the inadequacies of B and modified it to a new language ‘C’ • By mid 80s there were more than a hundred thousand Unix installations running on anythin ...
... Unix History Continued… • Ken Thomson created a new language ‘B’and rewrote the whole Unix code in this high level language • Dennis Ritchie shifted the inadequacies of B and modified it to a new language ‘C’ • By mid 80s there were more than a hundred thousand Unix installations running on anythin ...
ppt
... A program consists of: – code -- machine instructions – data -- variables stored and manipulated in memory, classified into • initialized variables (globals) • dynamically allocated variables (malloc, new) • stack variables (C automatic variables, function arguments) – DLL’s -- libraries that were n ...
... A program consists of: – code -- machine instructions – data -- variables stored and manipulated in memory, classified into • initialized variables (globals) • dynamically allocated variables (malloc, new) • stack variables (C automatic variables, function arguments) – DLL’s -- libraries that were n ...
solutions - CIS @ UPenn
... the programmer intended. The goal of the overflow is to overwrite the return address of the function to a new value and have the process execute code contained in the ...
... the programmer intended. The goal of the overflow is to overwrite the return address of the function to a new value and have the process execute code contained in the ...
Module 4: Processes
... Extensibility (Can easily add new functions--user processes) Flexibility (Can remove functions that are not needed) Portability (Only the small kernel has hardware specific code) Distributed System support (Message passing can generalize to network communications) Object oriented (A good d ...
... Extensibility (Can easily add new functions--user processes) Flexibility (Can remove functions that are not needed) Portability (Only the small kernel has hardware specific code) Distributed System support (Message passing can generalize to network communications) Object oriented (A good d ...
IOSystems
... Blocking and Non-blocking I/O Blocking - process suspended until I/O completed Easy to use and understand Insufficient for some needs Non-blocking - I/O call returns as much as available E.g., user interface, data copy (buffered I/O) Can be implemented via multi-threading Returns quic ...
... Blocking and Non-blocking I/O Blocking - process suspended until I/O completed Easy to use and understand Insufficient for some needs Non-blocking - I/O call returns as much as available E.g., user interface, data copy (buffered I/O) Can be implemented via multi-threading Returns quic ...
What is a Device Driver?
... Blocking and nonblocking I/O • There’s an important distinction between blocking and nonblocking I/O system calls. – If a process issues a blocking I/O system call, it waits until the I/O is completed. – If a process issues a nonblocking I/O call, it waits for a fixed interval, and then returns. – ...
... Blocking and nonblocking I/O • There’s an important distinction between blocking and nonblocking I/O system calls. – If a process issues a blocking I/O system call, it waits until the I/O is completed. – If a process issues a nonblocking I/O call, it waits for a fixed interval, and then returns. – ...