Assignment No. 03 Semester: Fall 2014 CS604 –Operating System Total Marks: 15 Due Date: 16/2/2015

[+ Aqib]

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Assignment
Question 1:   (5 Marks)   Consider the following snapshot of a system:     Allocation Max Available   A B C D A B C D A B C D P0 1 1 1 2 3 4 2 2 1 2 3 4 P1 1 0 2 2 1 3 4 14         P2 1 4 5 6 2 7 5 8         P3 2 5 4 2 3 5 7 9         P4 1 5 2 7 1 6 3 9           Need A B C D                                           Answer the following questions using the banker’s algorithm:   (a)   What is the content of the matrix Need?                                             5     (b)   Is the system in a safe state? If yes identify the safe sequence. Show the step by step execution by updating the data structure if necessary.                                                            10     NOTE:Do not put any query on MDB about this assignment, if you have any query then [e-mail].
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[Zakki]

Ans (b):

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[Zakki]

various safe sequences are possible.

& accordingly Available table will also be different.

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solution which Im presenting is one of many solutions.

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[0pzhjiix9o881]

i also have same safe sequence

[0pzhjiix9o881]

[+ Aqib]

correct !

[Genius...]

Zaki hahahah yar Available kese thek bna liya hai Need kyun nai thek bnaya... ?

[Emmi]

need mai MAX wali value ani hain na i m confused

[Genius...]

@Emmi Replace

[Rana Naveed]

2nd quiz ans please

[saleem Kalro]

(a) What is the content of the matrix Need?

need = max-allocation

3	4	2	2	max Po
1	1	1	2	allocation Po
2	3	1	0	Subtraction

in the same way you can get complete need matrix

Need
A	B	C	D
2	3	1	0
0	3	2	12
1	3	0	2
1	0	3	7
0	1	1	2

[saleem Kalro]

[Rana Naveed]

please give 2nd quiz ans bro