Since the parallel process AB needs to use two shared resources S1 and 2, I want to perform exclusive control as follows. What kind of problems will happen? 1 LOCK (S1) 2 LOCK(S2) 3 UNLOCK(S2) 4 UNLOCK(S1) a LOCK(S2) b LOCK(S1) c UNLOCK(S1) d UNLOCK(S2) Process A: Process B:

Since the parallel process AB needs to use two shared resources S1 and 2, I want to perform exclusive control as follows. What kind of problems will happen? 1 LOCK (S1) 2 LOCK(S2) 3 UNLOCK(S2) 4 UNLOCK(S1) a LOCK(S2) b LOCK(S1) c UNLOCK(S1) d UNLOCK(S2) Process A: Process B:

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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Question

Since the parallel process AB needs to use two shared resources S1 and 2, I want to perform
exclusive control as follows. What kind of problems will happen?
1 LOCK(S1)
2 LOCK(S2)
<critical section A>
3 UNLOCK(S2)
4 UNLOCK(S1)
a LOCK(S2)
b LOCK(S1)
<critical section B>
c UNLOCK(S1)
d UNLOCK(S2)
Process A:
Process B:

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