Computer Systems Overview
... View a process as a collection of one or more threads that can run simultaneously All threads within the same process share the same data and resources and a part of the process’s execution context Easier to create or destroy a thread and switch between threads (of the same process) than to cr ...
... View a process as a collection of one or more threads that can run simultaneously All threads within the same process share the same data and resources and a part of the process’s execution context Easier to create or destroy a thread and switch between threads (of the same process) than to cr ...
Contiguous Memory Allocation
... contains the value of the smallest physical address; the limit register contains the range of logical Addresses (for example, relocation= 100040 and limit= 74600). With relocation and limit registers, each logical address must be less than the limit register; the MMU maps the logical address dynamic ...
... contains the value of the smallest physical address; the limit register contains the range of logical Addresses (for example, relocation= 100040 and limit= 74600). With relocation and limit registers, each logical address must be less than the limit register; the MMU maps the logical address dynamic ...
15.a The Internal Operating System
... Page table Keeps track of what is in memory and what is still out on hard disk Chapter 15 The Internal Operating System – Part 1 ...
... Page table Keeps track of what is in memory and what is still out on hard disk Chapter 15 The Internal Operating System – Part 1 ...
Solution
... to provide economical interactive use of a system. The CPU switches rapidly from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen. d. Real time. Often used ...
... to provide economical interactive use of a system. The CPU switches rapidly from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen. d. Real time. Often used ...
Operating Systems Security
... Linux, DOS, OS X • 32-bit Linux: Lower 3GB for user code/data, top 1GB for kernel • Corresponds to x86 privilege ring transitions • Windows and OS X similar • DOS had no such fence, any process could alter DOS and viruses could spread by hooking DOS interrupt handlers via kernel changes ...
... Linux, DOS, OS X • 32-bit Linux: Lower 3GB for user code/data, top 1GB for kernel • Corresponds to x86 privilege ring transitions • Windows and OS X similar • DOS had no such fence, any process could alter DOS and viruses could spread by hooking DOS interrupt handlers via kernel changes ...
Document
... User Interface • The UI provides a consistent way for the user to interact with the computer, which is common to all models and manufacturers • There are two main types of UI: – Graphical User Interface (eg Windows) ...
... User Interface • The UI provides a consistent way for the user to interact with the computer, which is common to all models and manufacturers • There are two main types of UI: – Graphical User Interface (eg Windows) ...
Lecture 3
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing ...
CS111—Operating System Principles
... Back in the transistor-based technology, early mainframes were first run by human operators. The unit of processing was a job, or predefined collection of commands that are executed without human interaction. Operators would handle one job at a time (e.g., submitting punch cards, running the program ...
... Back in the transistor-based technology, early mainframes were first run by human operators. The unit of processing was a job, or predefined collection of commands that are executed without human interaction. Operators would handle one job at a time (e.g., submitting punch cards, running the program ...
Slides - Bilkent University Computer Engineering Department
... has finished its current operation or it has something by causing an interrupt ...
... has finished its current operation or it has something by causing an interrupt ...
Introduction to the course
... You should be able to discuss questions like these intelligently by the end of the course. ...
... You should be able to discuss questions like these intelligently by the end of the course. ...
Introduction - CS Course Webpages
... can only execute the code for a single process. • When the OS decides to transfer control from the current process to another process, it performs a context switch by saving the context of the current process, restoring the context of the new process, and passing control to the new process. ...
... can only execute the code for a single process. • When the OS decides to transfer control from the current process to another process, it performs a context switch by saving the context of the current process, restoring the context of the new process, and passing control to the new process. ...
Chapter 1: Introduction
... has finished its current operation or it has something by causing an interrupt ...
... has finished its current operation or it has something by causing an interrupt ...
16MCA24 - PESIT South
... In particular, the course will consider inherent functionality and processing of program execution . The emphasis of the course will be placed on understanding how the various elements that underlie operating system interact and provides services for execution of application software. 3. COURSE OBJE ...
... In particular, the course will consider inherent functionality and processing of program execution . The emphasis of the course will be placed on understanding how the various elements that underlie operating system interact and provides services for execution of application software. 3. COURSE OBJE ...
10-Software-Presentation
... program to hard disk or remove it Printer drivers – enable the computer to send the correct signals to the printer Email filter & web filters ...
... program to hard disk or remove it Printer drivers – enable the computer to send the correct signals to the printer Email filter & web filters ...
ppt - CS Course Webpages
... type of semiconductor memory in which the memory is stored in the form of a charge. Each memory cell in a DRAM is made of a transistor and a capacitor. The data is stored in the capacitor. Capacitors loose charge due to leakage and hence DRAM's are volatile devices. To keep the data in the memory, t ...
... type of semiconductor memory in which the memory is stored in the form of a charge. Each memory cell in a DRAM is made of a transistor and a capacitor. The data is stored in the capacitor. Capacitors loose charge due to leakage and hence DRAM's are volatile devices. To keep the data in the memory, t ...
lect_1
... contents of these registers to determine what action to take (such as “read a character from the keyboard”). The controller starts transferring of data from the device to its local buffer. Once the transfer of data is completing, the device controller informs the device driver via an interrupt that ...
... contents of these registers to determine what action to take (such as “read a character from the keyboard”). The controller starts transferring of data from the device to its local buffer. Once the transfer of data is completing, the device controller informs the device driver via an interrupt that ...
History of Operating Systems
... • Eventually manufacturers made their I/O libraries available at run time as an I/O Control System • Part of main memory was set aside for the IOCS, the rest of memory was for users • This was the first development to resemble on O/S • It introduced the idea of Memory Management • And made OS functi ...
... • Eventually manufacturers made their I/O libraries available at run time as an I/O Control System • Part of main memory was set aside for the IOCS, the rest of memory was for users • This was the first development to resemble on O/S • It introduced the idea of Memory Management • And made OS functi ...
Example Sheet for Operating Systems I (Part IA)
... (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy effect’. (f) A paged virtual memory is smaller than a segmented one. (g) Direct memory access (DMA) makes d ...
... (c) Non-blocking I/O is possible even when using a block device. (d) Shortest job first (SJF) is an optimal scheduling algorithm. (e) Round-robin scheduling can suffer from the so-called ‘convoy effect’. (f) A paged virtual memory is smaller than a segmented one. (g) Direct memory access (DMA) makes d ...
Memory Protection: Kernel and User Address Spaces
... However, each process believes that it owns the entire memory, starting with the virtual address 0 The missing piece is a translation table Translate every memory reference from virtual to physical addresses ...
... However, each process believes that it owns the entire memory, starting with the virtual address 0 The missing piece is a translation table Translate every memory reference from virtual to physical addresses ...