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Unit 5 part 2

Process schedule operating system

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Unit 5 part 2

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  1. 4/6/2015 1

  2. 4/6/2015 balance balance balance balance balance balance onecannotenter ; onecannotenter onecannotenter onecannotenter } 2

  3. 4/6/2015 ; p1w p2w occ t t f f f t t t t t t t t f f t f t t f t t f t 3

  4. 4/6/2015 ND NR result ND NR ND NR result Nothing done since There is some process Waiting for S 4

  5. 4/6/2015 i P i P F1 P1 P2 F2 5

  6. 4/6/2015 p3 p4 p1 p2 40% 90% 30% 94% . 6

  7. 4/6/2015 ( ) . 7

  8. 4/6/2015 . •   8

  9. 4/6/2015 9

  10. 4/6/2015 4 6 8 1 4 5 2 مدختسم ) 1 ( مدختسم ) 2 ( مدختسم ) 3 ( رفوتلما 2 4 6 8 1 4 5 2 مدختسم ) 1 ( مدختسم ) 2 ( مدختسم ) 3 ( رفوتلما 4 6 8 1 4 6 1 مدختسم ) 1 ( مدختسم ) 2 ( مدختسم ) 3 ( رفوتلما 10 5 3 8 2 1 1 مدختسم ) 1 ( مدختسم ) 2 ( مدختسم ) 3 ( رفوتلما 10

  11. 4/6/2015 P6 P5 P1 P2 P4 P3 11

  12. 4/6/2015 Test‐And‐Set p1w p2w occ P1: void main() { boolean p1wait = true; while(!done) { while (p1wait) testAndset(P1wait,occupied); CRITICAL SECTION p1wait = true; occupied = false; other stuff.. } P2: void main() { booleanp2wait = true; while(!done) { while (p2wait) testAndset(P2wait,occupied); CRITICAL SECTION p2wait = true; occupied = false; other stuff.. } t t f f t t f t t t t f t f t R7 t f t t t f t f t 12

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