CIS 3110 Lecture Notes - Lecture 8: Unix System V, Computer Multitasking, Parent Process
2 Mar 2018
School
Department
Course
Professor
Document Summary
A child process gets constructed using the same code and data as its parent-process. Saving the state of one process and loading another process onto the cpu. Modern cpu can preform 100 context switched /1s. Hardware support makes it faster but modern os preforms context switching. Update the pcb of the process that is currently running. A process tag or flush on each entry in the tlb on context switch. A page table pointer that must be reloaded on context switch. Major focus: avoid unnecessary context switching to the extent possible. Os software within context of a user process. Os executes within the environment of a user process in order to reduce the cost of context switching. Set of all processes residing in main memory, ready and waiting to execute. Set of processes waiting for an i/o device. Selects which processes should be brought into the ready queue. Selects which process should be executed next and allocates.
