www.vustudents.ning.com

We non-commercial site working hard since 2009 to facilitate learning Read More. We can't keep up without your support. Donate.

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

• Your assignment must be in .doc format. (Any other formats like scan images, PDF, Zip, rar, bmp,etc will not be accepted).
• No assignment will be accepted through email.

Rules for Marking:

It should be clear that your assignment will not get any credit if:

• The assignment is submitted after due date.
• The submitted assignment does not open or file is corrupted.
• Your assignment is copied from internet, handouts or from any other student

(Strict disciplinary action will be taken in this case).

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 emailatcs604@vu.edu.pk.

Views: 7401

Attachments:

### Replies to This Discussion

28 lecture aik br suna ho to easily khudy bana leni hy apne

right !

Ans (a):

=====

MR Zaki make correction in your Need The

Attachments:

Mr. Khas u also slipped a little.

see:

But Im happy to see you so sophisticated!

thanks for pointing out mistake.

Mr Zaki i think you forgot or misunderstanding somethings the formula of Need is NEEDi = MAXi - ALLOCATIONi...... So follow the sequance as you was following above Till P2.....

ur right!

yes ur need table is absolutely right!

ya.

If you are point outing my mistakes then at least give the proofs....coz im pretty sure that my NEED is 100% correct.... :)

yes it is.

bhai jitne ap intelligent ho muje lagta ye error jan bojh kr bana rahay ho k kahin baqi thek na kr de :P :P as clearly mention that

need = max -allocation phr b ye need table is ki reason b de dena ?

1

2

3

## Latest Activity

12 minutes ago
Haq Nawaz posted a photo

### 101666006_168365481373009_5753083756411879424_o

3 hours ago
M. Shaaf updated their profile
4 hours ago
4 hours ago
5 hours ago
+ ≋M≋S≋ posted a discussion

11 hours ago
20 hours ago
20 hours ago