Resource access control example
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Resource access control -- example. T2 and T3 have access to a shared resource R. c i x : Task duration before entering the critical section c i y : Critical section duration c i z : Task duration after the critical section ci = c i x + c i y + c i z By RMS, T3 > T1 > T2. Schedules.

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Resource access control -- example

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Resource access control example

Resource access control -- example

T2 and T3 have access to a shared resource R

cix : Task duration before entering the critical section

ciy : Critical section duration

ciz : Task duration after the critical section

ci = cix + ciy + ciz

By RMS, T3 > T1 > T2

CprE 458/558: Real-Time Systems (G. Manimaran)


Schedules

Schedules

Locks R

Preempted by T3

RMS Schedule

Direct blocking of T3 by T2

Release R

T3

T1

T2

T3

T2

T1

T2

T3

T3

T2

10

11

12

0

2

4

6

7

8

14

16

Priority inversion of T3 by T1

RMS Schedule with Priority Inheritance Protocol

Direct blocking of T3 by T2

T3

T1

T2

T3

T2

T3

T1

T3

T2

0

Inheritance blocking of T1 by T2

CprE 458/558: Real-Time Systems (G. Manimaran)


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