Answered: Draw the Resource-Allocation graph of…

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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Modern Operating Systems must tackle the challenges of Synchronization and Deadlock. ’Process Synchronization’ is the task of coordinating the execution of processes in a way that no two processes can have access to the same shared data or resource. A process requesting a resource may have to wait, if the resource is not available at that time. Sometimes, a waiting process is never able to change state, because the resources it has requested are held by other waiting processes; this situation is called ’Deadlock'.

Draw the Resource-Allocation graph of the following system:
= {Pa, Pb, Pc, Pd}
R = {R1., R2., R3.}'
E = {R1→ Pa, R2→ Pa, R3→ Pa, R2 Pb, R3 Pb, R3 Pc, Pb→ R1, Pc→ R1, ?→ ?, ?- ?}?
Is this system in deadlock? Justify your answer (no points without explanation).

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