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R
rupalidhir

The document discusses operating systems and their key functions. An operating system acts as an intermediary between users and computer hardware. It hides hardware details and provides a convenient interface. Operating systems execute programs, allocate resources efficiently between users and applications, and make the computer system easier to use.

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],USERS System SW & Application SW OS Hardware
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operating System User Process Unused User Area OS Area
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
USER JOB Operating System CPU Execution in progress OS AREA User program Area ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Partition 1 Partition n User Area Divided into n Equal Sized Partition OS Area Operating System Partition 2 Partition 3 Partition 4 . . Multiprogramming memory model with fixed number of memory partition
OS Free OS Free OS Free OS Free P1 P2 P1 P1 P2 P3 OS Free Free 2 P1 P3 OS Free P4 P1 P3 OS Free Free 3 P3 OS Free 1 P5 P3 Free 2 P4 Free 2 Free 2 P4 P1 Enters P2 Enters P3 Enters P4 Enters P1 Left P5 Enters
[object Object],[object Object],[object Object]
A process consists of an address space and one or more threads of control. Address Space Address Space Thread T1 T2 T3
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ready Blocked Running Job is allocated to CPU for Execution Allotted time slice is over Job must wait for IO Completion Job process Complete New job IO Completed
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object]

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Ch1

  • 1.  
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.  
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. Operating System User Process Unused User Area OS Area
  • 14.
  • 15.  
  • 16.
  • 17.
  • 18. Partition 1 Partition n User Area Divided into n Equal Sized Partition OS Area Operating System Partition 2 Partition 3 Partition 4 . . Multiprogramming memory model with fixed number of memory partition
  • 19. OS Free OS Free OS Free OS Free P1 P2 P1 P1 P2 P3 OS Free Free 2 P1 P3 OS Free P4 P1 P3 OS Free Free 3 P3 OS Free 1 P5 P3 Free 2 P4 Free 2 Free 2 P4 P1 Enters P2 Enters P3 Enters P4 Enters P1 Left P5 Enters
  • 20.
  • 21. A process consists of an address space and one or more threads of control. Address Space Address Space Thread T1 T2 T3
  • 22.
  • 23.
  • 24.
  • 25.
  • 26. Ready Blocked Running Job is allocated to CPU for Execution Allotted time slice is over Job must wait for IO Completion Job process Complete New job IO Completed
  • 27.
  • 28.
  • 29.
  • 30.
  • 31.
  • 32.
  • 33.