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Class notes

Processes - Lecture Notes (COMP15212)

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These lecture notes from COMP15212 provide an in-depth look into process management. Learn about process lifecycle, inter-process communication, and scheduling algorithms. Ideal for students aiming to understand how operating systems manage multiple processes efficiently.

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  • May 29, 2024
  • 2
  • 2023/2024
  • Class notes
  • Sean bechhofer
  • All classes
  • Unknown
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Processes

Definition Batch Processing

A process is
fundamentally a container that holds all the Job 1

information needed to run
program
a
.



Job 2


Job 3


new terminated Job Y
admitted J


exit

interrupt
# First In First Out
W
ready
-running
scheduler
Job 1 Job 2 Job 3 Job Y


Executed
-




1/0 or event
- dispatch I/0 or
completition event wait
Application o
on the CPU !
Shortest Job Next

waiting *
Operating System Job Y Job 1 Job 2 Job 3




Example With 1/0 points

int a , b; JobY Job 1 Job 2 Job 3




Y
scanf ("God" &a) ;
in put
Scanf (" %d" , & b) ; #
W



3
·




int s = a + b
; compute

Printf (" % d In" s) ; , youtput
With voluntary "yield' points as well


Job Y Job 1 Job 2 Job 3




*




How a system boots
up ?
Process Control Block

Process
1 init
systemd/launched a demon process
ID
Resource
Parent ID &
Info 2
Resource
·

Priority




T
2 #
-




Info 1
daemon process
PPID
adopts orphan
PID 3 ↑ xterm
killed
Registers S
Memory
bash 7 Block 2
8


Memory
fork creates a
D


9 child process Resources Block 1


Memory Memory
*

Block 3
Orphans
-




If parent before its children the children Next PCB
a
expires ,
are adopted' by init.

- to next PCB


Zombies


Childprocesses whichhavterminatedbutthis habenobsonbyRirroradot a

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