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Which one of the following Graph with a Cycle but No Deadlock? R, R, P R. All of them have a deadlock R, P2 R R R P R4 .. .. ...

Which one of the following Graph with a Cycle but No Deadlock? R, R, P R. All of them have a deadlock R, P2 R R R P R4 .. .. ...

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Which one of the following Graph with a Cycle but No Deadlock? R, R. R2 R. All of them have a deadlock R, R Ps P3 R R.
Transcribed Image Text:Which one of the following Graph with a Cycle but No Deadlock? R, R. R2 R. All of them have a deadlock R, R Ps P3 R R.
Expert Solution
Step 1

Option 2:

R1 has one instance

R2 has 2 instances 

R3 has one instance

-------------

Process P2 using R1 and R2 and waiting for R3.

Process P3 using R3 and waiting for R2.

Process P1 using R2 and waiting for R1.

The graph has deadlock. Because every process is holding some resources and waiting for resources hold by other processes 

i.e P1 is waiting for R1, which is hold by P2 and P2 is waiting for R3 which is hold by P3, where P3 is waiting for R2 which is hold by P1 and P2

So option 2 is wrong 

So option 1 is wrong

 

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