Operating System Questions and Answers – Classic Synchronization Problems

This set of 1000+ Operating System MCQs focuses on “The Classic Synchronization Problems”

1) The bounded buffer problem is also known as :
a) Readers – Writers problem
b) Dining – Philosophers problem
c) Producer – Consumer problem
d) None of these
View Answer

Answer: c
Explanation: None.

2) In the bounded buffer problem, there are the empty and full semaphores that :
a) count the number of empty and full buffers
b) count the number of empty and full memory spaces
c) count the number of empty and full queues
d) None of these
View Answer

Answer: a
Explanation: None.

3) In the bounded buffer problem :
a) there is only one buffer
b) there are n buffers ( n being greater than one but finite)
c) there are infinite buffers
d) the buffer size is bounded
View Answer

Answer: b
Explanation: None.

4) To ensure difficulties do not arise in the readers – writers problem, _______ are given exclusive access to the shared object.
a) readers
b) writers
c) None of these
View Answer

Answer: b
Explanation: None.

5) The dining – philosophers problem will occur in case of :
a) 5 philosophers and 5 chopsticks
b) 4 philosophers and 5 chopsticks
c) 3 philosophers and 5 chopsticks
d) 6 philosophers and 5 chopsticks
View Answer

Answer: a
Explanation: None.

6) A deadlock free solution to the dining philosophers problem :
a) necessarily eliminates the possibility of starvation
b) does not necessarily eliminate the possibility of starvation
c) eliminates any possibility of any kind of problem further
d) None of these
View Answer

Answer: b
Explanation: None.

7) All processes share a semaphore variable mutex, initialized to 1. Each process must execute wait(mutex) before entering the critical section and signal(mutex) afterward.

i) Suppose a process executes in the following manner :
signal(mutex);
…..
critical section
…..
wait(mutex);

In this situation :
a) a deadlock will occur
b) processes will starve to enter critical section
c) several processes maybe executing in their critical section
d) All of these
View Answer

Answer: c
Explanation: None.

ii) Suppose a process executes in the following manner (replacing signal with wait) :
a) a deadlock will occur
b) processes will starve to enter critical section
c) several processes maybe executing in their critical section
d) All of these
View Answer

Answer: a
Explanation: None.

8) Consider the methods used by processes P1 and P2 for accessing their critical sections whenever needed, as given below. The initial values of shared boolean variables S1 and S2 are randomly assigned. (GATE 2010)

Method used by P1 :
while(S1==S2);
Critical section
S1 = S2;

Method used by P2 :
while(S1!=S2);
Critical section
S2 = not(S1);

Which of the following statements describes properties achieved ?
a) Mutual exclusion but not progress
b) Progress but not mutual exclusion
c) Neither mutual exclusion nor progress
d) Both mutual exclusion and progress
View Answer

Answer: d
Explanation: None.

Sanfoundry Global Education & Learning Series – Operating System.

About

Manish Bhojasia, a technology veteran with 17+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below.


Sanfoundry Training Center of Excellence (CoE)

Manish Bhojasia, a technology veteran with 17+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below.







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