COS 318: Operating Systems I/O Device and Drivers Prof. Margaret Martonosi
... System call code checks for correctness and buffer cache If it needs to perform I/O, it will issues a device driver call Device driver allocates a buffer for read and schedules I/O Controller performs DMA data transfer Block the current process and schedule a ready process Device generates an interr ...
... System call code checks for correctness and buffer cache If it needs to perform I/O, it will issues a device driver call Device driver allocates a buffer for read and schedules I/O Controller performs DMA data transfer Block the current process and schedule a ready process Device generates an interr ...
Figure 15.1 A distributed multimedia system
... integrity does not come only from maliciously contrived code. Benign code that contains a bug or which has unanticipated behavior may cause part of the rest of the system to behave incorrectly. Protecting the file consists of two sub-problem ...
... integrity does not come only from maliciously contrived code. Benign code that contains a bug or which has unanticipated behavior may cause part of the rest of the system to behave incorrectly. Protecting the file consists of two sub-problem ...
Lecture 15
... Each process completes its full CPU burst cycle before the next process is scheduled. No time slicing or CPU stealing occurs. Once a process has control of the CPU, it keeps control until it gives it up (e.g. to wait for I/O or to terminate). Works OK for batch processing systems, but not su ...
... Each process completes its full CPU burst cycle before the next process is scheduled. No time slicing or CPU stealing occurs. Once a process has control of the CPU, it keeps control until it gives it up (e.g. to wait for I/O or to terminate). Works OK for batch processing systems, but not su ...
PowerPoint
... users often wish to perform more than one activity at a time and uniprogramming does not allow this. z Uniprogrammed systems put in things like memory-resident programs that invoked asynchronously. One key problem with DOS is that there is no memory protection - one program may write the memory of a ...
... users often wish to perform more than one activity at a time and uniprogramming does not allow this. z Uniprogrammed systems put in things like memory-resident programs that invoked asynchronously. One key problem with DOS is that there is no memory protection - one program may write the memory of a ...
Blue Background
... Directories are organized into a hierarchical tree structure, beginning with an initial root directory. All other directories are derived from this root directory. Linux file system is one large interconnected set of directories, each containing files. Also with Linux user can set permissions on d ...
... Directories are organized into a hierarchical tree structure, beginning with an initial root directory. All other directories are derived from this root directory. Linux file system is one large interconnected set of directories, each containing files. Also with Linux user can set permissions on d ...
Powerpoint () - UCSB Computer Science
... The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that two shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is u ...
... The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that two shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is u ...
lecture 14
... The main disadvantage of the semaphore discussed in the previous section is that they all require busy waiting. While a process is in its critical section, any other process that tries to enter its critical section must loop continuously in the entry code. This continual looping is clearly a problem ...
... The main disadvantage of the semaphore discussed in the previous section is that they all require busy waiting. While a process is in its critical section, any other process that tries to enter its critical section must loop continuously in the entry code. This continual looping is clearly a problem ...
Conclusion - PC poradna
... aswndis2.sys (avast! Filtering NDIS driver, AVAST Software) If no updates for these drivers are available, try searching with Google on the names of these drivers in combination the errors that have been reported for these drivers and include the brand and model name of your computer as well in the ...
... aswndis2.sys (avast! Filtering NDIS driver, AVAST Software) If no updates for these drivers are available, try searching with Google on the names of these drivers in combination the errors that have been reported for these drivers and include the brand and model name of your computer as well in the ...
Patterns for Operating Systems Access Control
... Operating systems are fundamental to provide security to computing systems. The operating system supports the execution of applications and any security constraints defined at that level must be enforced by the operating system. The operating system must also protect itself because compromise would ...
... Operating systems are fundamental to provide security to computing systems. The operating system supports the execution of applications and any security constraints defined at that level must be enforced by the operating system. The operating system must also protect itself because compromise would ...
Processes and Threads process
... that makes concurrency easier to deal with. In this model, each runnable software on the computer—often components of the operating system itself—is organized into a number of (sequential) processes, each viewed as a block of code with a pointer showing the next instruction to be executed. How can s ...
... that makes concurrency easier to deal with. In this model, each runnable software on the computer—often components of the operating system itself—is organized into a number of (sequential) processes, each viewed as a block of code with a pointer showing the next instruction to be executed. How can s ...
Chapter 13: I/O Systems
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
Chapter 2: Operating-System Structures
... system had limited structuring. The UNIX OS consists of two separable parts ...
... system had limited structuring. The UNIX OS consists of two separable parts ...
operating system
... An operating system is a collection of technologies which are designed to allow the computer to perform certain functions. These technologies may or may not be present in every operating system, and there are often differences in how they are implemented. However as stated above most modern op ...
... An operating system is a collection of technologies which are designed to allow the computer to perform certain functions. These technologies may or may not be present in every operating system, and there are often differences in how they are implemented. However as stated above most modern op ...
Ch_04
... a. Register values b. Heap memory c. Global variables d. Stack memory Answer: The threads of a multithreaded process share heap memory and global variables. Each thread has its separate set of register values and a separate stack. 4.5 Can a multithreaded solution using multiple user-level threads ac ...
... a. Register values b. Heap memory c. Global variables d. Stack memory Answer: The threads of a multithreaded process share heap memory and global variables. Each thread has its separate set of register values and a separate stack. 4.5 Can a multithreaded solution using multiple user-level threads ac ...
as a PDF
... Shortest job next (SJN), also known as Shortest Job First (SJF) or Shortest Process Next (SPN), is a scheduling policy that selects the waiting process with the smallest execution time to execute next. SJN is a non-preemptive algorithm. Shortest remaining time is a preemptive variant of SJN. Shortes ...
... Shortest job next (SJN), also known as Shortest Job First (SJF) or Shortest Process Next (SPN), is a scheduling policy that selects the waiting process with the smallest execution time to execute next. SJN is a non-preemptive algorithm. Shortest remaining time is a preemptive variant of SJN. Shortes ...
slides-2
... 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. ...
Silberschatz, Galvin and Gagne ©2013 Operating System Concepts
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
Linux Pres1 - Parent Directory
... The kernel is the core program that runs programs and manages Hardware devices and mostly written in “C”. Allocates the system resources, scheduling of task and memory management. 2. SHELL – interface between user and kernel The Shell provides an interface for the user. It receives commands from the ...
... The kernel is the core program that runs programs and manages Hardware devices and mostly written in “C”. Allocates the system resources, scheduling of task and memory management. 2. SHELL – interface between user and kernel The Shell provides an interface for the user. It receives commands from the ...
Silberschatz, Galvin and Gagne ©2009 Operating System Concepts
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
... STREAM – a full-duplex communication channel between a user-level process and a device in Unix System V and beyond ...
2.01
... Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by ...
... Simplest: pass the parameters in registers In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by ...
CS 519 -- Operating Systems -
... Threads vs. Processes Why multiple threads? Can’t we use multiple processes to do whatever that is that we do with multiple threads? Of course, we need to be able to share memory (and other resources) between multiple processes … But this sharing is already supported – see later in the lecture ...
... Threads vs. Processes Why multiple threads? Can’t we use multiple processes to do whatever that is that we do with multiple threads? Of course, we need to be able to share memory (and other resources) between multiple processes … But this sharing is already supported – see later in the lecture ...
Process Execution time deadline
... low latency with loss of CPU/cache state low latency with loss of all state except memory lowest-power state with all devices off ...
... low latency with loss of CPU/cache state low latency with loss of all state except memory lowest-power state with all devices off ...
- TestbankU
... techniques. In a modular design, the kernel needs only to have the capability to perform the required functions and know how to communicate between modules. However, if more functionality is required in the kernel, then the user can dynamically load modules into the kernel. The kernel can have secti ...
... techniques. In a modular design, the kernel needs only to have the capability to perform the required functions and know how to communicate between modules. However, if more functionality is required in the kernel, then the user can dynamically load modules into the kernel. The kernel can have secti ...
Module 4: Processes - GMU Computer Science
... and other segments There must be at least one thread in a process Threads within a process share code/data/heap, share I/O, but each has its own stack and registers Expensive creation Expensive context switching If a process dies, its resources are reclaimed and all threads die ...
... and other segments There must be at least one thread in a process Threads within a process share code/data/heap, share I/O, but each has its own stack and registers Expensive creation Expensive context switching If a process dies, its resources are reclaimed and all threads die ...
The Operating System
... Protection - ensuring that all access to system resources is controlled Security - user authentication, defending external I/O devices from invalid access attempts, etc. ...
... Protection - ensuring that all access to system resources is controlled Security - user authentication, defending external I/O devices from invalid access attempts, etc. ...