Last Class: Introduction to Operating Systems Course Staff Office
... Crossing Protection Boundaries • System call: OS procedure that executes privileged instructions (e.g., I/O) ; also API exported by the kernel – Causes a trap, which vectors (jumps) to the trap handler in the OS kernel. – The trap handler uses the parameter to the system call to jump to the appropri ...
... Crossing Protection Boundaries • System call: OS procedure that executes privileged instructions (e.g., I/O) ; also API exported by the kernel – Causes a trap, which vectors (jumps) to the trap handler in the OS kernel. – The trap handler uses the parameter to the system call to jump to the appropri ...
Last Class: Introduction to Operating Systems
... Crossing Protection Boundaries • System call: OS procedure that executes privileged instructions (e.g., I/O) ; also API exported by the kernel – Causes a trap, which vectors (jumps) to the trap handler in the OS kernel. – The trap handler uses the parameter to the system call to jump to the appropri ...
... Crossing Protection Boundaries • System call: OS procedure that executes privileged instructions (e.g., I/O) ; also API exported by the kernel – Causes a trap, which vectors (jumps) to the trap handler in the OS kernel. – The trap handler uses the parameter to the system call to jump to the appropri ...
L03
... What is an Operating System (OS)? • A computer program • Performs many operations: • Allows you to communicate with the computer (tell it what to do) • Controls access (login) to the computer • Keeps track of all “processes” currently running ...
... What is an Operating System (OS)? • A computer program • Performs many operations: • Allows you to communicate with the computer (tell it what to do) • Controls access (login) to the computer • Keeps track of all “processes” currently running ...
Najwa Knefati operating system chapter 1
... organizing jobs (code and data) so that the CPU always has one to execute. in general, main memory is too small to accommodate all jobs, the jobs are kept initially on the disk in the job pool This pool consists of all processes residing on disk awaiting allocation of main memory. The OS picks and b ...
... organizing jobs (code and data) so that the CPU always has one to execute. in general, main memory is too small to accommodate all jobs, the jobs are kept initially on the disk in the job pool This pool consists of all processes residing on disk awaiting allocation of main memory. The OS picks and b ...
Module 4: Processes
... Those tasks that are ready-to-run comprise a sub-list of all the tasks, and they are arranged on a queue known as the ‘run-queue’ Those tasks that are blocked while awaiting a specific event to occur are put on alternative sub-lists, called ‘wait queues’, associated with the particular event(s) that ...
... Those tasks that are ready-to-run comprise a sub-list of all the tasks, and they are arranged on a queue known as the ‘run-queue’ Those tasks that are blocked while awaiting a specific event to occur are put on alternative sub-lists, called ‘wait queues’, associated with the particular event(s) that ...
CUSTOMER_CODE SMUDE DIVISION_CODE SMUDE
... of resources. Other resources such as memory and I/O devices are available to all processors. If they are available only to a few then system becomes asymmetric. The operating system is also symmetric. Any processor can execute it. The processor which executes the operating ...
... of resources. Other resources such as memory and I/O devices are available to all processors. If they are available only to a few then system becomes asymmetric. The operating system is also symmetric. Any processor can execute it. The processor which executes the operating ...
4th Edition: Chapter 1
... Application programs – define the ways in which the system resources are used to solve the computing problems of the users • Word processors, compilers, web browsers, database systems, ...
... Application programs – define the ways in which the system resources are used to solve the computing problems of the users • Word processors, compilers, web browsers, database systems, ...
Processes and threads
... The resource part is called a task or a job. The location part is commonly called a thread. ...
... The resource part is called a task or a job. The location part is commonly called a thread. ...
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 ...
What is an Operating System?
... resident monitor from user programs, loading of user programs after monitor. ...
... resident monitor from user programs, loading of user programs after monitor. ...
IT241 Final Exam Study Guide
... problem. Debugger is a powerful tool that can be used to detect and replicate the original problem as well as trace the running program step by step. 3. Early in the history of computer, each computer ran one process at a time. This was not an efficient practice because when a process is waiting for ...
... problem. Debugger is a powerful tool that can be used to detect and replicate the original problem as well as trace the running program step by step. 3. Early in the history of computer, each computer ran one process at a time. This was not an efficient practice because when a process is waiting for ...
3D Shape Correspondence
... Kernel: to be studied in this course! The one program running at all times on the computer. ...
... Kernel: to be studied in this course! The one program running at all times on the computer. ...
Monolithic, Mikrokernel and Exokernel
... expose “virtual” resources based on the capabilities of the physical devices hide the fact that physical resources are scarce and may only be controlled by a single owner multiplex access to hardware resources enforce access conditions and permissions ...
... expose “virtual” resources based on the capabilities of the physical devices hide the fact that physical resources are scarce and may only be controlled by a single owner multiplex access to hardware resources enforce access conditions and permissions ...
Module 2: Computer-System Structures
... • The operating system preserves the state of the CPU by storing registers and the program counter. • Separate segments of code determine what action should be taken for each type of interrupt Interrupt Time Line For a Single Process Doing Output ...
... • The operating system preserves the state of the CPU by storing registers and the program counter. • Separate segments of code determine what action should be taken for each type of interrupt Interrupt Time Line For a Single Process Doing Output ...
CENG334 Introduction to Operating Systems
... Share one machine across many different apps: concurrent execution You would be surprised how much slack there is in a typical computer system ...
... Share one machine across many different apps: concurrent execution You would be surprised how much slack there is in a typical computer system ...
CS420: Operating Systems Multiprocessor Scheduling
... Scheduling Multithreaded Multicore Systems • Two levels of scheduling must take place (1) Operating system is still scheduling tasks based on its scheduling algorithms ...
... Scheduling Multithreaded Multicore Systems • Two levels of scheduling must take place (1) Operating system is still scheduling tasks based on its scheduling algorithms ...
Module 3: Operating
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the ...
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the ...
CENG334 Introduction to Operating Systems
... Share one machine across many different apps: concurrent execution You would be surprised how much slack there is in a typical computer system ...
... Share one machine across many different apps: concurrent execution You would be surprised how much slack there is in a typical computer system ...
Slide 10 : Multiprocessor Scheduling
... are controlled by the master processor and provide services to it ...
... are controlled by the master processor and provide services to it ...
Operating Systems Overview - Physics, Computer Science and
... Problem: one job can't keep both CPU and I/O devices busy. Get poor utilization either of CPU or I/O devices. Solution: z multiprogramming - several jobs share system. Dynamically switch from one job to another when the running job does I/O. ...
... Problem: one job can't keep both CPU and I/O devices busy. Get poor utilization either of CPU or I/O devices. Solution: z multiprogramming - several jobs share system. Dynamically switch from one job to another when the running job does I/O. ...
Lecture 2 - Overview
... Most applications use standard drivers such as display and keyboard drivers. • Driver for new device can be implemented without having to modify the o/s • Range of optional drivers made available and configured for range of devices eg printers. • Only drivers actually required by system need to be l ...
... Most applications use standard drivers such as display and keyboard drivers. • Driver for new device can be implemented without having to modify the o/s • Range of optional drivers made available and configured for range of devices eg printers. • Only drivers actually required by system need to be l ...
Design and implementation of the Lambda µ
... The Lambda operating system employs µ-kernel architecture, which allows the operating system to be easily designed. Embedded systems have various hardwares and we must develop device drivers for them. This feature is very important for embedded systems. However, µ-kernel architecture is slower and c ...
... The Lambda operating system employs µ-kernel architecture, which allows the operating system to be easily designed. Embedded systems have various hardwares and we must develop device drivers for them. This feature is very important for embedded systems. However, µ-kernel architecture is slower and c ...
Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... Hardware Mutual Exclusion: Disadvantages • Busy-waiting consumes processor time • Starvation is possible when a process leaves a critical section and more than one process is waiting – Some process could indefinitely be denied access because selection of a waiting process is arbitrary ...
... Hardware Mutual Exclusion: Disadvantages • Busy-waiting consumes processor time • Starvation is possible when a process leaves a critical section and more than one process is waiting – Some process could indefinitely be denied access because selection of a waiting process is arbitrary ...