MODERN OPERATING SYSTEMS Third Edition ANDREW S. …
... • When process #1 enters its critical region, it sets the variable to 2 when it leaves. • Process #2 would still be waiting by this time, and would enter its critical region as soon as the variable goes to 2. • If it were the last of the cooperating processes, it would set the variable back to 0 aga ...
... • When process #1 enters its critical region, it sets the variable to 2 when it leaves. • Process #2 would still be waiting by this time, and would enter its critical region as soon as the variable goes to 2. • If it were the last of the cooperating processes, it would set the variable back to 0 aga ...
This chapter covers the following key topics: • Operating Systems
... CPU Resource Management and Multitasking Although some operating systems only allow one program to run at a time (most versions of MS-DOS operate this way, for example), it’s more common to find operating systems managing multiple programs concurrently. Running multiple programs at once is called mu ...
... CPU Resource Management and Multitasking Although some operating systems only allow one program to run at a time (most versions of MS-DOS operate this way, for example), it’s more common to find operating systems managing multiple programs concurrently. Running multiple programs at once is called mu ...
ผู้ผลิต
... requiring busy waiting. Not only does this approach waste CPU time, but it can also have unexpected effects. Consider a computer with two processes, H, with high priority and L, with low priority. The scheduling rules are such that H is run whenever it is in ready state. At a certain moment, with L ...
... requiring busy waiting. Not only does this approach waste CPU time, but it can also have unexpected effects. Consider a computer with two processes, H, with high priority and L, with low priority. The scheduling rules are such that H is run whenever it is in ready state. At a certain moment, with L ...
File - ashish b. khare
... Memory management is the act of managing computer memory. The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request, and freeing it for reuse when no longer needed. This is critical to the computer system. Several method ...
... Memory management is the act of managing computer memory. The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request, and freeing it for reuse when no longer needed. This is critical to the computer system. Several method ...
What is an Operating System?
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing z Response time should be < 1 second z Each user has at least one program executing in memory >process z If several jobs ready to run at the same time > CPU scheduling z If ...
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing z Response time should be < 1 second z Each user has at least one program executing in memory >process z If several jobs ready to run at the same time > CPU scheduling z If ...
CENG334 Introduction to Operating Systems
... to cope with a speed mismatch between the producer and consumer of a data stream. a file is being received via modem for storage on the hard disk to adapt between devices that have different data-transfer sizes. networking: messages are typically framented during sending and receiving to support ...
... to cope with a speed mismatch between the producer and consumer of a data stream. a file is being received via modem for storage on the hard disk to adapt between devices that have different data-transfer sizes. networking: messages are typically framented during sending and receiving to support ...
Chapter 2 Computer-System Structures 2
... user program perform I/O? • System call – the method used by a process to request action by the operating system. – 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 t ...
... user program perform I/O? • System call – the method used by a process to request action by the operating system. – 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 t ...
slides
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). • A job swapped in and out of memory to the disk. • On-line communication between the user and the system is provided: – When the operating system finishes the execution of one command, it seeks the next “contro ...
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). • A job swapped in and out of memory to the disk. • On-line communication between the user and the system is provided: – When the operating system finishes the execution of one command, it seeks the next “contro ...
Chapter 6: Process/thread Synchronization
... there exist some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be postponed indefinitely" 3. "Bounded Waiting - A bound must exist on the number of times that other processes are allowed to enter their critic ...
... there exist some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be postponed indefinitely" 3. "Bounded Waiting - A bound must exist on the number of times that other processes are allowed to enter their critic ...
Introducing Operating Systems
... – Preserving space in main memory occupied by operating system – Checking validity and legality of memory space ...
... – Preserving space in main memory occupied by operating system – Checking validity and legality of memory space ...
EuroDesign embedded technologies GmbH
... you can partition the harddisk now. Create a first primary partition, choose as a size about 1 MB. Then create a second primary partition which for example covers the rest of the disk. The first partition is “hda1” the second partition “hda2” now. The operating system binary image gets the device “h ...
... you can partition the harddisk now. Create a first primary partition, choose as a size about 1 MB. Then create a second primary partition which for example covers the rest of the disk. The first partition is “hda1” the second partition “hda2” now. The operating system binary image gets the device “h ...
ch2
... that an incorrect program or poorly behaving human cannot cause other programs to execute incorrectly OS must provide hardware support to differentiate between at ...
... that an incorrect program or poorly behaving human cannot cause other programs to execute incorrectly OS must provide hardware support to differentiate between at ...
COS 318: Operating Systems Virtual Machine Monitors Prof. Margaret Martonosi Computer Science Department
... Since the VMM doesn’t match any real hardware, an OS running on it MUST be changed, not legacy. ...
... Since the VMM doesn’t match any real hardware, an OS running on it MUST be changed, not legacy. ...
Operating Systems
... Must be done in groups of 2 or 3 Can change groups from Assignment 1 (if you wish) Must have a blog on Blackboard Lecture 14: Operating Systems ...
... Must be done in groups of 2 or 3 Can change groups from Assignment 1 (if you wish) Must have a blog on Blackboard Lecture 14: Operating Systems ...
Linux Help Session
... other networks Used by the route command and allows you to specify a network by name instead of by address ...
... other networks Used by the route command and allows you to specify a network by name instead of by address ...
Week-3
... transformations of the text Programming-language support - Compilers, assemblers, debuggers and interpreters sometimes provided Program loading and execution- Absolute loaders, relocatable loaders, linkage editors, and overlay-loaders, debugging systems for higher-level and machine language Co ...
... transformations of the text Programming-language support - Compilers, assemblers, debuggers and interpreters sometimes provided Program loading and execution- Absolute loaders, relocatable loaders, linkage editors, and overlay-loaders, debugging systems for higher-level and machine language Co ...
IOSystems
... OS defines interface to DDs Non-standard across OSs => device manufacturers have to provide a DD for each OS (bugger) Applications normally reach the DDs via the OS Escape entry (e.g., ioctl) allows more direct access ...
... OS defines interface to DDs Non-standard across OSs => device manufacturers have to provide a DD for each OS (bugger) Applications normally reach the DDs via the OS Escape entry (e.g., ioctl) allows more direct access ...
ICS 143 - Introduction to Operating Systems
... On completion of I/O, device forces CPU to jump to a specific instruction address that contains the interrupt service routine. After the interrupt has been processed, CPU returns to code it was executing prior to servicing the interrupt. Principles of Operating Systems Lecture 1 ...
... On completion of I/O, device forces CPU to jump to a specific instruction address that contains the interrupt service routine. After the interrupt has been processed, CPU returns to code it was executing prior to servicing the interrupt. Principles of Operating Systems Lecture 1 ...
Comparison of Amoeba Vs Mach Operating Systems
... running on the DEC VAX computer family, including multiprocessor versions of the VAX. Versions for the IBM RT/PC and for SUN 3 workstations followed shortly. 1987 saw the completion of the Encore Multimax and Sequent Balance multiprocessor versions, including task and thread support, as well as the ...
... running on the DEC VAX computer family, including multiprocessor versions of the VAX. Versions for the IBM RT/PC and for SUN 3 workstations followed shortly. 1987 saw the completion of the Encore Multimax and Sequent Balance multiprocessor versions, including task and thread support, as well as the ...
Document
... – Single program cannot keep CPU and I/O devices busy at all times – Multiprogramming increases CPU utilization by organizing jobs (code and data) so that the CPU always has one to execute. ...
... – Single program cannot keep CPU and I/O devices busy at all times – Multiprogramming increases CPU utilization by organizing jobs (code and data) so that the CPU always has one to execute. ...
Embedded Operating Systems for Real
... system. Here each task runs until it is finished and only after that next task is started. In shortest job first scheduler each time a running task completes or blocks itself, next task selected is one that will require the least amount of processor time to complete. Round robin is the only scheduli ...
... system. Here each task runs until it is finished and only after that next task is started. In shortest job first scheduler each time a running task completes or blocks itself, next task selected is one that will require the least amount of processor time to complete. Round robin is the only scheduli ...
Signals and Threads
... Does fork() duplicate only the calling thread or all threads? Using fork() copies the process as separate duplicate Some UNIX systems have 2 versions of fork() ...
... Does fork() duplicate only the calling thread or all threads? Using fork() copies the process as separate duplicate Some UNIX systems have 2 versions of fork() ...
Microkernels
... Mach Performance System calls take 5-6X as long as UNIX. Message Passing Uses pointers, copy-on-write, and memory mapping to avoid unnecessary copies. Port rights checks are expensive. ...
... Mach Performance System calls take 5-6X as long as UNIX. Message Passing Uses pointers, copy-on-write, and memory mapping to avoid unnecessary copies. Port rights checks are expensive. ...