PPT
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
ppt - UCI
... Children share subset of parent’s resources - prevents many processes from overloading the system. Parent and children share no resources. ...
... Children share subset of parent’s resources - prevents many processes from overloading the system. Parent and children share no resources. ...
Introduction - University of Pennsylvania
... During execution, process may call OS to perform I/O: console, disk, printer, etc. (system call interface, I/O device drivers) When process terminates, memory is reclaimed (memory management) ...
... During execution, process may call OS to perform I/O: console, disk, printer, etc. (system call interface, I/O device drivers) When process terminates, memory is reclaimed (memory management) ...
Course objectives: 1. To learn the fundamentals of Operating
... Case Study: Linux system, Design Principles, kernel modules, process management, scheduling, memory management, file system, input and output, inter process communication, network structure, security ...
... Case Study: Linux system, Design Principles, kernel modules, process management, scheduling, memory management, file system, input and output, inter process communication, network structure, security ...
Architectural Support for Operating Systems
... – Then transfers control to a standard start address in this image – The small version of the O/S loads and starts the “big” version. • The two stage mechanism is used so that BIOS won’t need to understand the file system implemented by the “big” O/S kernel • File systems are complex data structures ...
... – Then transfers control to a standard start address in this image – The small version of the O/S loads and starts the “big” version. • The two stage mechanism is used so that BIOS won’t need to understand the file system implemented by the “big” O/S kernel • File systems are complex data structures ...
Architectural Support for Operating Systems
... – Then transfers control to a standard start address in this image – The small version of the O/S loads and starts the “big” version. • The two stage mechanism is used so that BIOS won’t need to understand the file system implemented by the “big” O/S kernel • File systems are complex data structures ...
... – Then transfers control to a standard start address in this image – The small version of the O/S loads and starts the “big” version. • The two stage mechanism is used so that BIOS won’t need to understand the file system implemented by the “big” O/S kernel • File systems are complex data structures ...
Process Description and Control
... produce a process switch The control can just return to the interrupted program Then only the processor state information needs to be saved on stack (ref. Chap 1) This is called mode switching (user to kernel mode when going into IH) Less overhead: no need to update the PCB like for process switchin ...
... produce a process switch The control can just return to the interrupted program Then only the processor state information needs to be saved on stack (ref. Chap 1) This is called mode switching (user to kernel mode when going into IH) Less overhead: no need to update the PCB like for process switchin ...
Greetings Hnoagain. D. O'Dell
... of large distributed software applications in spite of there being no shortage of large problems needing such solutions. This paper discusses the linguistic approach developed in their system, the processing tools to support the language extensions, and the distributed run-time support environment w ...
... of large distributed software applications in spite of there being no shortage of large problems needing such solutions. This paper discusses the linguistic approach developed in their system, the processing tools to support the language extensions, and the distributed run-time support environment w ...
Week 5 - Portland State University
... Why use traps for system calls? The Operating System is just a program! It must have the privilege to manipulate the hardware set base and limit registers for memory protection access devices set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do n ...
... Why use traps for system calls? The Operating System is just a program! It must have the privilege to manipulate the hardware set base and limit registers for memory protection access devices set and clear mode bit to enable privilege If user programs execute with the mode bit clear, and do n ...
batch systems
... Yet More Issues in OS • scale and growth - what happens as demands or resources increase? • persistence - how to make data last longer than programs • compatibility - can we ever do anything new? • distribution - can the components of the system be geographically separated? • accounting - who pays ...
... Yet More Issues in OS • scale and growth - what happens as demands or resources increase? • persistence - how to make data last longer than programs • compatibility - can we ever do anything new? • distribution - can the components of the system be geographically separated? • accounting - who pays ...
Unit I Operating Systems in Distributed Environments
... have the function to coordinate to the other parts of an OS such as : I/O Devices, Process, Memory and File Systems. • The structure of and OS could be different but in most of the time are very similar because some OS use Open Standards. ...
... have the function to coordinate to the other parts of an OS such as : I/O Devices, Process, Memory and File Systems. • The structure of and OS could be different but in most of the time are very similar because some OS use Open Standards. ...
Architectural Support for Operating Systems
... • Interrupts and traps • Protection, system calls and operating mode • OS structure • What happens when you boot a computer? ...
... • Interrupts and traps • Protection, system calls and operating mode • OS structure • What happens when you boot a computer? ...
9. Application/Kernel Interface
... Call the service function in the kernel Linux: array of function pointers indexed by system call number ...
... Call the service function in the kernel Linux: array of function pointers indexed by system call number ...
Processes and Threads
... • Multiprogramming or concurrency is the concept of having multiple executing entities (e.g., processes) to effectively utilize system resources. For example, if a system has multiple processes, then the CPU can switch to another process when one process makes a blocking system call. Multiprogrammin ...
... • Multiprogramming or concurrency is the concept of having multiple executing entities (e.g., processes) to effectively utilize system resources. For example, if a system has multiple processes, then the CPU can switch to another process when one process makes a blocking system call. Multiprogrammin ...
OS Services System calls and their types
... • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how much and what kinds of computer resources – Protection and ...
... • Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code – Accounting - To keep track of which users use how much and what kinds of computer resources – Protection and ...
Hassan Al-Makso`s presentation on Making OS Reliable and Secure
... the microkernel handles interrupts, provides the basic mechanisms for process management, implements interprocess communication, and performs process scheduling. Each I/O device has its own driver that runs as a separate process in its own private address space, protected by the memory managemen ...
... the microkernel handles interrupts, provides the basic mechanisms for process management, implements interprocess communication, and performs process scheduling. Each I/O device has its own driver that runs as a separate process in its own private address space, protected by the memory managemen ...
Sai Uday Kiran Ravi`s presentation on Application Security on
... Overshadow interposes on clone and fork system calls to set up the new thread’s initial state. This includes cloning the memory integrity hashes and thread context (including the instruction pointer), thereby ensuring that the new thread can only be started in the same state as its parent. To en ...
... Overshadow interposes on clone and fork system calls to set up the new thread’s initial state. This includes cloning the memory integrity hashes and thread context (including the instruction pointer), thereby ensuring that the new thread can only be started in the same state as its parent. To en ...
Sec (3.2)
... controllers to carry out operations on the peripheral devices attached to the machine. Each device driver is uniquely designed for its particular type of device (printer, disk drive, monitor) and translate generic requests into the more technical steps required by the device assigned to that driver. ...
... controllers to carry out operations on the peripheral devices attached to the machine. Each device driver is uniquely designed for its particular type of device (printer, disk drive, monitor) and translate generic requests into the more technical steps required by the device assigned to that driver. ...
Operating Systems
... • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends • P1 completes execution – P2 resumes and executes echo • This example shows that it is necessary to prote ...
... • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends • P1 completes execution – P2 resumes and executes echo • This example shows that it is necessary to prote ...
Chapter 3 Process Description and Control
... shared memory. Increment the counters for any files owned by the parent, to reflect that an additional process now also owns those files. Assign the child process to the Ready state. Returns the ID number of the child to the parent process, and a 0 value to the child process. ...
... shared memory. Increment the counters for any files owned by the parent, to reflect that an additional process now also owns those files. Assign the child process to the Ready state. Returns the ID number of the child to the parent process, and a 0 value to the child process. ...
Chapter3
... • Resources controlled by the process may be indicated, such as opened files. A history of utilization of the processor or other resources may also be included; this information may be needed by the scheduler. ...
... • Resources controlled by the process may be indicated, such as opened files. A history of utilization of the processor or other resources may also be included; this information may be needed by the scheduler. ...
lecture 9
... Operating Systems I (CSC 406) CPU first. The implementation of an FCFS policy is managed with a FIFO queue. When a process enters the ready queue, its PCB is linked onto the tail of the queue. When CPU is free, it is allocated to the process at the head of the queue. The running process is removed ...
... Operating Systems I (CSC 406) CPU first. The implementation of an FCFS policy is managed with a FIFO queue. When a process enters the ready queue, its PCB is linked onto the tail of the queue. When CPU is free, it is allocated to the process at the head of the queue. The running process is removed ...
Document
... “base register” used to convert each virtual address to a physical address before main memory is accessed address is compared to a “limit register” to keep memory ...
... “base register” used to convert each virtual address to a physical address before main memory is accessed address is compared to a “limit register” to keep memory ...