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# Assignment No 3 CS-604

Assignment No. 03

Semester: Spring 2018

Operating Systems (CS604)

Total Marks: 20

Due Date:  23/7/2018

Instructions:

§  You should submit your assignment before or on due date on VULMS.

§  Your assignment should be your own work in your own words. It should not be copied from Internet, handouts or books.

§  Your Assignment must be in Microsoft Word document. Assignment in other than Microsoft Word document will not be accepted.

§  Assignment sent via Email will not be replied and accepted.

§  If the submitted assignment does not open or file is corrupt, it will not be marked and hence awarded zero marks.

Objectives:

·         To understand the working of Deadlock detection algorithm.

For any query about the assignment, contact at CS604@vu.edu.pk

Question                                                                                                                                    Marks 20

a. Consider a system with five processes: P1, P2, P3, P4, P5 and five resource types: R1, R2, R3, R4, R5 with single instance. From the given below information, you are required to determine whether the deadlock exists in the system though deadlock detection strategy for resources with single instance.

P = {P1, P2, P3, P4, P5}

R = {R1, R2, R3, R4, R5}

E = {P1®R1, R1®P2, P2®R2, R2®P3, P3®R3, R3®P4, P4®R4, R4®P5, P5®R5, R5®P1}

b. Consider a system with five processes: P1, P2, P3, P4, P5 and four resource types: R1, R2, R3 and R4 with multiple instances. From the given below information, you are required to determine whether the deadlock occurs in a system though deadlock detection strategy for resources with multiple instances.

P = {P1, P2, P3, P4, P5}

R = {R1, R2, R3, R4}

R1: 5 instances

R2: 3 instances

R3: 2 instances

R4: 4 instances

Consider the system in following state:

 Processes Allocation Request Work R1 R2 R3 R4 R1 R2 R3 R4 R1 R2 R3 R4 P1 0 0 0 0 0 1 0 0 0 0 1 1 P2 0 1 0 1 0 0 1 1 P3 2 0 0 2 0 0 1 1 P4 1 1 0 0 2 1 2 0 P5 2 1 1 0 1 0 0 1

Note: There can be many sequences so you are required to start from top to bottom for “Processes” column. i.e. P1 to P5.

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### Replies to This Discussion

Given scenario k saath jaha sy b start kro graph aik hi bany ga.

Dear Fellow Students

You can use Attached file for creating the dead lock graph for part A of question using the MS visio

Attachments:

Consider the system:

 Processes Allocation Request Work R1 R2 R3 R4 R1 R2 R3 R4 R1 R2 R3 R4 P1 0 0 0 0 0 1 0 0 0 0 1 1 P2 0 1 0 1 0 0 1 1 0 1 1 2 P3 2 0 0 2 0 0 1 1 P4 1 1 0 0 2 1 2 0 P5 2 1 1 0 1 0 0 1

Here Finish Sequence: < P2>  and <P1> not finish because request is not completed.

 Processes Allocation Request Work R1 R2 R3 R4 R1 R2 R3 R4 R1 R2 R3 R4 P1 0 0 0 0 0 1 0 0 0 0 1 1 P2 0 1 0 1 0 0 1 1 0 1 1 2 P3 2 0 0 2 0 0 1 1 2 1 1 4 P4 1 1 0 0 2 1 2 0 P5 2 1 1 0 1 0 0 1

Now Finish Sequence: <  P2, P3> and  <P1> not finish because request is not completed.

 Processes Allocation Request Work R1 R2 R3 R4 R1 R2 R3 R4 R1 R2 R3 R4 P1 0 0 0 0 0 1 0 0 0 0 1 1 P2 0 1 0 1 0 0 1 1 0 1 1 2 P3 2 0 0 2 0 0 1 1 2 1 1 4 P4 1 1 0 0 2 1 2 0 3 2 1 4 P5 2 1 1 0 1 0 0 1 5 3 2 4

Finish Sequence: <  P2, P3, P5> and  <P1, P4> not finish because request is not completed.

Note: We can be other sequences to finish these process but we are required to start from top to bottom for “Processes” column. i.e. P1 to P5 only. So deadlock exist.

this is wrong on right?

Attachments:

mistakes in sample

Attachments:

helo ABDUL FAHID bhae wah g idr sol die ja re

ya assignment ai kin lecturez ma sy ha koi yhi bata do...

29 lec main s

ok thnks

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