Deck 24: Operating System and Thread Pool

Question 1

A process can never be sure that a signal it has sent___________  

A)has which identifier
B)has not been lost
C)has been sent
D)all of the mentioned

Answer 1

has not been lost

Question 2

In UNIX, the___________    system call is used to send a signal.

A)sig
B)send
C)kill
D)sigsend

Answer 2

kill

Question 3

Thread pools are useful when

A)when we need to limit the number of threads running in the application at the same time
B)when we need to limit the number of threads running in the application as a whole
C)when we need to arrange the ordering of threads
D)none of the mentioned

Answer 3

when we need to limit the number of threads running in the application at the same time

Question 4

Instead of starting a new thread for every task to execute concurrently, the task can be passed to a___________        

A)process
B)thread pool
C)thread queue
D)none of the mentioned

Question 5

Each connection arriving at multi threaded servers via network is generally

A)is directly put into the blocking queue
B)is wrapped as a task and passed on to a thread pool
C)is kept in a normal queue and then sent to the blocking queue from where it is dequeued
D)none of the mentioned

Question 6

What is the idea behind thread pools?

A)a number of threads are created at process startup and placed in a pool where they sit and wait for work
B)when a process begins, a pool of threads is chosen from the many existing and each thread is allotted equal amount of work
C)all threads in a pool distribute the task equally among themselves
D)none of the mentioned

Question 7

If the thread pool contains no available thread___________

A)the server runs a new process
B)the server goes to another thread pool
C)the server demands for a new pool creation
D)the server waits until one becomes free

Question 8

Thread pools help in___________

A)servicing multiple requests using one thread
B)servicing a single request using multiple threads from the pool
C)faster servicing of requests with an existing thread rather than waiting to create a new thread
D)none of the mentioned

Question 9

The number of the threads in the pool can be decided on factors such as___________

A)number of cpus in the system
B)amount of physical memory
C)expected number of concurrent client requests
D)all of the mentioned

Question 10

The swaps processes in and out of the memory.

A)Memory Manager
B)CPU
C)CPU Manager
D)User

Question 11

Operating System maintains the page table for

A)each process
B)each thread
C)each instruction
D)each address

Question 12

What is operating system?

A)collection of programs that manages hardware
B)system service provider to the
C)link to interface the hardware and
D)all of the mentioned

Question 13

In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the:

A)blocked state
B)ready state
C)suspended state
D)terminated state

Question 14

In virtual memory, which is not a page replacement algorithm ?

A)FIFO
B)BFS
C)LRU
D)Optimal

Question 15

Thrashing the CPU utilization.

A)increases
B)keep constant
C)decreases
D)None of the mentioned

Question 16

Mutual exclusion can be provided by the___________      

A)mutex locks
B)binary semaphores
C)both mutex locks and binary
D)none of the mentioned

Question 17

A parent process calling system call will be suspended until children processes terminate.

A)wait
B)fork
C)exit
D)exec

Question 18

The child process completes execution, but the parent keeps executing, then the child process is known as

A)Orphan
B)Zombie
C)Body
D)Dead

Question 19

When the process issues an I/O request___________      

A)It is placed in an I/O queue
B)It is placed in a waiting queue
C)It is placed in the ready queue
D)It is placed in the Job queue

Question 20

Which one of the following is the deadlock avoidance algorithm?

A)banker's algorithm
B)elevator algorithm
C)karn's algorithm
D)none of the mentioned

Question 21

File type can be represented by___________

A)file name
B)file extension
C)file identifier
D)none of the mentioned

Question 22

Which of the following are the two parts of the file name?

A)name & identifier
B)identifier & type
C)extension & name
D)type & extension

Question 23

Which of the following are forms of malicious attack?

A)Theft of information
B)Modification of data
C)Wiping of information
D)All of the mentioned

Question 24

From the following, which is not a common file permission?

A)Write
B)Execute
C)Stop
D)Read