Consider Fig. 6-4. Suppose that in step (o) C requested S instead of requesting R.Would this lead to deadlock? Suppose that it requested both S and R. 442DEADLOCKSСНAР. 6AвRequest RRequest SRequest SRequest TRelease SRequest TRequest RRelease TRelease RRelease SRelease TRelease R(a)(b)(c)1. A requests R2. B requests S3. C requests T4. A requests S5. B requests T6. C requests RdeadlockSS(d)(e)(f)B)S(h)(i)1. A requests R2. C requests T3. A requests S4. C requests R5. A releases R6. A releases Sno deadlockS(k)(1)(m)(n)o) ロo)SRR(p)Figure 6-4. An example of how deadlock occurs and how it can be avoided.B.

Answered: Consider Fig. 6-4. Suppose that in step…

Consider Fig. 6-4. Suppose that in step (o) C requested S instead of requesting R. Would this lead to deadlock? Suppose that it requested both S and R.

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

Consider Fig. 6-4. Suppose that in step (o) C requested S instead of requesting R.
Would this lead to deadlock? Suppose that it requested both S and R.

442
DEADLOCKS
СНAР. 6
A
в
Request R
Request S
Request S
Request T
Release S
Request T
Request R
Release T
Release R
Release S
Release T
Release R
(a)
(b)
(c)
1. A requests R
2. B requests S
3. C requests T
4. A requests S
5. B requests T
6. C requests R
deadlock
S
S
(d)
(e)
(f)
B)
S
(h)
(i)
1. A requests R
2. C requests T
3. A requests S
4. C requests R
5. A releases R
6. A releases S
no deadlock
S
(k)
(1)
(m)
(n)
o) ロo)
S
R
R
(p)
Figure 6-4. An example of how deadlock occurs and how it can be avoided.
B.

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