OSreviewS2004
... • When CPU switches to another process, the system must save the state of the old process and load the saved state for the new process. • Context-switch time is overhead; the system does no useful work while ...
... • When CPU switches to another process, the system must save the state of the old process and load the saved state for the new process. • Context-switch time is overhead; the system does no useful work while ...
What is an operating system?
... Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instructions can be executed Runs on behalf of a use ...
... Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instructions can be executed Runs on behalf of a use ...
B - 周清江副教授
... (a) If the priority for P1 is 3, for P2 is 1, and for P3 is 2, draw the Gantt chart with the priority scheduling. (Note: process with priority 1 has the highest priority) What is the average turnaround time? (b) Draw the Gantt chart with the round-robin scheduling with time quantum 1. What is the av ...
... (a) If the priority for P1 is 3, for P2 is 1, and for P3 is 2, draw the Gantt chart with the priority scheduling. (Note: process with priority 1 has the highest priority) What is the average turnaround time? (b) Draw the Gantt chart with the round-robin scheduling with time quantum 1. What is the av ...
Process Control Block entity that defines a process to the OS
... Operating systems must interleave the execution of a number of processes to maximize processor use – while providing reasonable response rate ...
... Operating systems must interleave the execution of a number of processes to maximize processor use – while providing reasonable response rate ...
Answers
... Dennis Ritchie – primary inventor of the C language, co-inventor of UNIX Ken Thompson – Inventor of UNIX, contributed to C language. (Also inventor of B language) 2. What is POSIX? Portable Operating System Interface for Computing Environments Same system call interface standardized among UNIX-like ...
... Dennis Ritchie – primary inventor of the C language, co-inventor of UNIX Ken Thompson – Inventor of UNIX, contributed to C language. (Also inventor of B language) 2. What is POSIX? Portable Operating System Interface for Computing Environments Same system call interface standardized among UNIX-like ...
My Problems: 1. Suppose that it is time for the operating system to
... Yes, it is possible that a process waits on more than one event at the same time. For example, a process may need to transfer data from one device to another. In this case, it may request both devices at once and wait until both are available for use. Another example is that a network application ma ...
... Yes, it is possible that a process waits on more than one event at the same time. For example, a process may need to transfer data from one device to another. In this case, it may request both devices at once and wait until both are available for use. Another example is that a network application ma ...
OPERATING-SYSTEM
... IT occurs when a group of processes each have granted exclusive access to some resources,and each one wants yet another resources that belongs to another process in the group. all of them are blocked and none will ever run again. ...
... IT occurs when a group of processes each have granted exclusive access to some resources,and each one wants yet another resources that belongs to another process in the group. all of them are blocked and none will ever run again. ...
Operating systems. History. Function. Organization. Software
... peripheral devices connected to the computer • Each driver is specifically designed for its type of device (e.g. printer, monitor, etc..) and translates generic requests into device specific sequence of operations ...
... peripheral devices connected to the computer • Each driver is specifically designed for its type of device (e.g. printer, monitor, etc..) and translates generic requests into device specific sequence of operations ...
Document
... peripheral devices connected to the computer • Each driver is specifically designed for its type of device (e.g. printer, monitor, etc..) and translates generic requests into device specific sequence of operations ...
... peripheral devices connected to the computer • Each driver is specifically designed for its type of device (e.g. printer, monitor, etc..) and translates generic requests into device specific sequence of operations ...
CS 5080 Syllabus
... Structure of operating systems. Physical input-output, buffering, interrupt processing. Memory, processor, device, information management; resource management interdependencies. Job and processor scheduling. Prerequisite: CS 3270. Course type: ...
... Structure of operating systems. Physical input-output, buffering, interrupt processing. Memory, processor, device, information management; resource management interdependencies. Job and processor scheduling. Prerequisite: CS 3270. Course type: ...
Chapter 2 Operating System Overview
... • The sequence in which the programs are executed depends on their relative priority (see scheduler) and whether they are waiting for I/O • After an interrupt handler completes, control may not return to the program that was executing at the time of the interrupt ...
... • The sequence in which the programs are executed depends on their relative priority (see scheduler) and whether they are waiting for I/O • After an interrupt handler completes, control may not return to the program that was executing at the time of the interrupt ...
Answers
... Dennis Ritchie – primary inventor of the C language, co-inventor of UNIX Ken Thompson – Inventor of UNIX, contributed to C language. (Also inventor of B language) 2. What is POSIX? Portable Operating System Interface for Computing Environments Same system call interface standardized among UNIX-like ...
... Dennis Ritchie – primary inventor of the C language, co-inventor of UNIX Ken Thompson – Inventor of UNIX, contributed to C language. (Also inventor of B language) 2. What is POSIX? Portable Operating System Interface for Computing Environments Same system call interface standardized among UNIX-like ...
Southeastern University
... –operating system software within context of a user process –process executes in privileged mode when executing operating system code Process-Based Operating System –major kernel functions are separate processes –Useful in multi-processor or multi-computer environment 10. What are the reasons for ...
... –operating system software within context of a user process –process executes in privileged mode when executing operating system code Process-Based Operating System –major kernel functions are separate processes –Useful in multi-processor or multi-computer environment 10. What are the reasons for ...
5. What is an Operating System? Explain its components Answer An
... Provides basic computing resources (CPU, memory, I/O devices).2. Operating System: Controls and coordinates the use of the hardware among the variousapplication programs for the various users.3. Application Programs: Define the ways in which the system resources are used to solve thecomputing proble ...
... Provides basic computing resources (CPU, memory, I/O devices).2. Operating System: Controls and coordinates the use of the hardware among the variousapplication programs for the various users.3. Application Programs: Define the ways in which the system resources are used to solve thecomputing proble ...
lecture notes
... Initially, the cache is empty ▪ Ask the user to input a number in range 1..100 ▪ If the answer is not in the cache, call calculateAnswer() and display the resulting sum; store the result in the cache ▪ If the answer is in the cache, simply display the answer ...
... Initially, the cache is empty ▪ Ask the user to input a number in range 1..100 ▪ If the answer is not in the cache, call calculateAnswer() and display the resulting sum; store the result in the cache ▪ If the answer is in the cache, simply display the answer ...
tutorial-02-with
... system. Information is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. Q 11) List five services provided by an operating system, and explain how each creates convenience for users ...
... system. Information is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. Q 11) List five services provided by an operating system, and explain how each creates convenience for users ...
operating-systems-7th-edition-william-stallings
... 2.7 A virtual address refers to a memory location in virtual memory. That location is on disk and at some times in main memory. A real address is an address in main memory. 2.8 Round robin is a scheduling algorithm in which processes are activated in a fixed cyclic order; that is, all processes are ...
... 2.7 A virtual address refers to a memory location in virtual memory. That location is on disk and at some times in main memory. A real address is an address in main memory. 2.8 Round robin is a scheduling algorithm in which processes are activated in a fixed cyclic order; that is, all processes are ...
Homework 1 Solutions
... Then, a microyear is 10−6 * 3.155815296 * 107 ≈ 31.558 seconds. This is one of those cases where you don’t need 8 digits of precision. (b) If a car is traveling 25200 miles per fortnight, fast is it traveling in inches per second? A fortnight is 2 weeks = 14 days = 336 hours = 20,160 minutes = 1,209 ...
... Then, a microyear is 10−6 * 3.155815296 * 107 ≈ 31.558 seconds. This is one of those cases where you don’t need 8 digits of precision. (b) If a car is traveling 25200 miles per fortnight, fast is it traveling in inches per second? A fortnight is 2 weeks = 14 days = 336 hours = 20,160 minutes = 1,209 ...
Chapter 1 PowerPoint
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – Many jobs are kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job • Timesharing (multitasking) is logical extension in which CPU switc ...
... – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – Many jobs are kept in memory – One job selected and run via job scheduling – When it has to wait (for I/O for example), OS switches to another job • Timesharing (multitasking) is logical extension in which CPU switc ...