1.1 What is an Operating System?
... with one another through various communication lines, such as high-speed buses or telephone lines. These systems are usually referred to as distributed system. ...
... with one another through various communication lines, such as high-speed buses or telephone lines. These systems are usually referred to as distributed system. ...
Fundamental Concepts
... An interruption of the normal processing of processor. Interrupts are a mechanism for causing the CPU to suspend its current computation and take up some new task. Control may be returned to the original task at some time later. Reasons for interrupts (or traps): – control of asynchronous I/O device ...
... An interruption of the normal processing of processor. Interrupts are a mechanism for causing the CPU to suspend its current computation and take up some new task. Control may be returned to the original task at some time later. Reasons for interrupts (or traps): – control of asynchronous I/O device ...
Unit OS 6: Principles of I/O Systems
... The initiator process may be suspended pending the interrupt ...
... The initiator process may be suspended pending the interrupt ...
Scale and Performance in the Denali Isolation Kernel
... The Delani virtual instruction set is a subset of x86, so that most virtual instructions execute directly on the physical processor. x86 VMMs normally have to use binary rewriting and memory protection techniques to virtualize some of the instructions. Since Delani does not support legacy operating ...
... The Delani virtual instruction set is a subset of x86, so that most virtual instructions execute directly on the physical processor. x86 VMMs normally have to use binary rewriting and memory protection techniques to virtualize some of the instructions. Since Delani does not support legacy operating ...
Processes - UniMAP Portal
... I/O, execution could possibly switch to another thread of the same application (instead of switching to another process) • Therefore necessary to synchronize the activities of various threads so that they do not obtain inconsistent views of the data (detailed in chap 5) ...
... I/O, execution could possibly switch to another thread of the same application (instead of switching to another process) • Therefore necessary to synchronize the activities of various threads so that they do not obtain inconsistent views of the data (detailed in chap 5) ...
15 - Portland State University
... Wake up the user process else *serialDataReg = kernelBuffer[i] i = i + 1 endIf Return from interrupt ...
... Wake up the user process else *serialDataReg = kernelBuffer[i] i = i + 1 endIf Return from interrupt ...
ppt
... Processes can only access objects in their ring or in outer rings; processes can invoke subroutines only within their ring; processes need gates to execute procedures in an inner ring. Information about system objects like memory segments, access control tables, or gates is stored in descriptors. Th ...
... Processes can only access objects in their ring or in outer rings; processes can invoke subroutines only within their ring; processes need gates to execute procedures in an inner ring. Information about system objects like memory segments, access control tables, or gates is stored in descriptors. Th ...
Computer-System Architecture Computer
... – Usually takes the form of a trap to a specific location in the interrupt vector. – Control passes through the interrupt vector to a service routine in the OS, and the mode bit is set to kernel mode. – The kernel verifies that the parameters are correct and legal, executes the request, and returns ...
... – Usually takes the form of a trap to a specific location in the interrupt vector. – Control passes through the interrupt vector to a service routine in the OS, and the mode bit is set to kernel mode. – The kernel verifies that the parameters are correct and legal, executes the request, and returns ...
Operating Systems
... • A single user ran a single program ran on a single computer – there was no need for an OS • Then came computer operators who ran multiple programs for multiple users one after the other – still, no need for an OS • Later computers became powerful, & became able to run multiple programs, simultaneo ...
... • A single user ran a single program ran on a single computer – there was no need for an OS • Then came computer operators who ran multiple programs for multiple users one after the other – still, no need for an OS • Later computers became powerful, & became able to run multiple programs, simultaneo ...
Multiuser Systems
... processes can progress at once. An operating system component called the scheduler chooses the process that can progress. Some operating systems allow only non preemptable processes, which means that the scheduler is invoked only when a process voluntarily relinquishes the CPU. But processes of a m ...
... processes can progress at once. An operating system component called the scheduler chooses the process that can progress. Some operating systems allow only non preemptable processes, which means that the scheduler is invoked only when a process voluntarily relinquishes the CPU. But processes of a m ...
Memory Protection
... Manual: Volume 3. Sections 4.5 through 4.8 – http://developer.intel.com/design/processor/man uals/253668.pdf ...
... Manual: Volume 3. Sections 4.5 through 4.8 – http://developer.intel.com/design/processor/man uals/253668.pdf ...
lecture3
... (synchronous as well as asynchronous). Interrupts are issued by interval timers and I/O devices; for instance, the arrival of a keystroke from a user sets off an interrupt. Exceptions, on the other hand, are caused either by programming errors or by anomalous conditions that must be handled by the k ...
... (synchronous as well as asynchronous). Interrupts are issued by interval timers and I/O devices; for instance, the arrival of a keystroke from a user sets off an interrupt. Exceptions, on the other hand, are caused either by programming errors or by anomalous conditions that must be handled by the k ...
MINIX 3: status report and current research
... the system is running, without a reboot, and without affecting running processes. While Ksplice [5] can make small patches to Linux on the fly, it cannot update to a whole new version without a reboot (and thus downtime). Our starting point for the live update is that the writer of the component kno ...
... the system is running, without a reboot, and without affecting running processes. While Ksplice [5] can make small patches to Linux on the fly, it cannot update to a whole new version without a reboot (and thus downtime). Our starting point for the live update is that the writer of the component kno ...
Chapter 1
... CPU Scheduling Needed: • Fair • Avoid Starvation Memory Management also needed: • Fair • Secure ...
... CPU Scheduling Needed: • Fair • Avoid Starvation Memory Management also needed: • Fair • Secure ...
Linux - Rock Fort Networks
... predated that of Linux. Linus Torvalds has said that if 386BSD had been available at the time, he probably would not have created Linux. ...
... predated that of Linux. Linus Torvalds has said that if 386BSD had been available at the time, he probably would not have created Linux. ...
Operating System Overview Operating System
... Memory management System access Network support CS240 ...
... Memory management System access Network support CS240 ...
Process management
... create one or more new processes to help it do the job • Useful when the work to be done can be formulated in terms of several related but otherwise independent interacting processes • E.g. In Unix when compiling a large program, the make program invokes the C compiler to convert source file to obje ...
... create one or more new processes to help it do the job • Useful when the work to be done can be formulated in terms of several related but otherwise independent interacting processes • E.g. In Unix when compiling a large program, the make program invokes the C compiler to convert source file to obje ...
Sandboxing - Syracuse University
... Concentrate on the open system call, and always allow read and write calls. Why? The application is placed in a particular directory; it cannot chdir out of this directory. The application is allowed read access to certain carefully controlled files referenced by absolute pathnames, such as sh ...
... Concentrate on the open system call, and always allow read and write calls. Why? The application is placed in a particular directory; it cannot chdir out of this directory. The application is allowed read access to certain carefully controlled files referenced by absolute pathnames, such as sh ...
Background - The University of Alabama in Huntsville
... • In shared memory multiprocessors the hardware must deal with – Memory contention: two processors try to access the same block of memory at the same time – Cache coherence: If one processor changes data in its cache other processors must be notified that their cached copy is out of date ...
... • In shared memory multiprocessors the hardware must deal with – Memory contention: two processors try to access the same block of memory at the same time – Cache coherence: If one processor changes data in its cache other processors must be notified that their cached copy is out of date ...
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY
... To make the students understand the basic operating system concepts such as processes, threads, scheduling, synchronization, deadlocks, memory management, file and I/O subsystems and protection. To get acquaintance with the class of abstractions afford by general purpose operating systems that a ...
... To make the students understand the basic operating system concepts such as processes, threads, scheduling, synchronization, deadlocks, memory management, file and I/O subsystems and protection. To get acquaintance with the class of abstractions afford by general purpose operating systems that a ...
CSE451 Introduction to Operating Systems
... – On the blank side of the note card write in one sentence your own definition of an operating system – On the lined side of the card write three things you would like this ...
... – On the blank side of the note card write in one sentence your own definition of an operating system – On the lined side of the card write three things you would like this ...
I/O Management Software Operating System Design Issues
... Typically, handler runs in the context of the currently running process ...
... Typically, handler runs in the context of the currently running process ...
EN_C2_Eng - BCS Koolitus
... The operating system can also be seen as a resources5 manager. Let us imagine what may happen if several programs use the same device (say a printer) at the same time. The result could be chaotic as the prints of the programs may overlap. From this point of view the operating system acts as a refere ...
... The operating system can also be seen as a resources5 manager. Let us imagine what may happen if several programs use the same device (say a printer) at the same time. The result could be chaotic as the prints of the programs may overlap. From this point of view the operating system acts as a refere ...
The Mach System
... – Layered approach– so, seems good in principle • Is the UNIX (or other “user application” O/S) really a User Application? – Are users going to write additional operating systems? ...
... – Layered approach– so, seems good in principle • Is the UNIX (or other “user application” O/S) really a User Application? – Are users going to write additional operating systems? ...
Intro. to Computer - web page for staff
... sometimes used to increase the speed of processing by making current programs and data available to the CPU at a rapid rate. The cache memory is employed in computer systems to compensate for the speed differential between main memory access time, with the result that processing speed is limited pri ...
... sometimes used to increase the speed of processing by making current programs and data available to the CPU at a rapid rate. The cache memory is employed in computer systems to compensate for the speed differential between main memory access time, with the result that processing speed is limited pri ...