Operating Systems for Programmers - Module 2 - Post-Quiz

Question 1

The ____ of a process contains temporary data such as function parameters, return addresses, and local variables.

Accepted Answer

stack

Answer

text section

Answer

data section

Answer

program counter

Question 2

When a child process is created, which of the following is a possibility in terms of the execution or address space of the child process?

Accepted Answer

All of the above

Answer

The child process runs concurrently with the parent.

Answer

The child process has a new program loaded into it.

Answer

The child is a duplicate of the parent.

Question 3

A _________________ saves the state of the currently running process and restores the state of the next process to run.

Accepted Answer

context switch

Answer

save-and-restore

Answer

state switch

Answer

none of the above

Question 4

A process may transition to the Ready state by which of the following actions?

Accepted Answer

All of the above

Answer

Completion of an I/O event

Answer

Awaiting its turn on the CPU

Answer

Newly-admitted process

Question 5

A blocking send() and blocking receive() is known as a(n) _________________.

Accepted Answer

rendezvous

Answer

synchronized message

Answer

blocked message

Answer

asynchronous message

Question 6

A(n) ______________ allows several unrelated processes to use the pipe for communication.

Accepted Answer

named pipe

Answer

anonymous pipe

Answer

LIFO

Answer

ordinary pipe

Question 7

Imagine that a host with IP address 150.55.66.77 wishes to download a file from the web server at IP address 202.28.15.123. Select a valid socket pair for a connection between this pair of hosts.

Accepted Answer

150.55.66.77:2000 and 202.28.15.123:80

Answer

150.55.66.77:80 and 202.28.15.123:80

Answer

150.55.66.77:150 and 202.28.15.123:80

Answer

150.55.66.77:80 and 202.28.15.123:3500

Question 8

Child processes inherit UNIX ordinary pipes from their parent process because:

Accepted Answer

A pipe is treated as a file descriptor and child processes inherit open file descriptors from their parents.

Answer

The pipe is part of the code and children inherit code from their parents.

Answer

The STARTUPINFO structure establishes this sharing.

Answer

All IPC facilities are shared between the parent and child processes.

Question 9

A process that has terminated, but whose parent has not yet called wait(), is known as a ________ process.

Accepted Answer

zombie

Answer

orphan

Answer

terminated

Answer

init

Question 10

The _______ process is assigned as the parent to orphan processes.

Accepted Answer

init

Answer

zombie

Answer

main

Answer

renderer

Question 11

____ is a thread library for Solaris that maps many user-level threads to one kernel thread.

Accepted Answer

Green threads

Answer

Pthreads

Answer

Sthreads

Answer

Java threads

Question 12

Pthreads refers to ____.

Accepted Answer

a specification for thread behavior

Answer

the POSIX standard

Answer

an implementation for thread behavior

Answer

an API for process creation and synchronization

Question 13

Cancellation points are associated with ____ cancellation.

Accepted Answer

deferred

Answer

asynchronous

Answer

synchronous

Answer

non-deferred

Question 14

Signals can be emulated in windows through ____.

Accepted Answer

asynchronous procedure calls

Answer

local procedure calls

Answer

remote procedure calls

Answer

none of the above

Question 15

_____ is not considered a challenge when designing applications for multicore systems.

Accepted Answer

Ensuring there is a sufficient number of cores

Answer

Deciding which activities can be run in parallel

Answer

Determining if data can be separated so that it is accessed on separate cores

Answer

Identifying data dependencies between tasks

Question 16

A ____ provides an API for creating and managing threads.

Accepted Answer

thread library

Answer

set of system calls

Answer

multicore system

Answer

multithreading model

Question 17

The most common technique for writing multithreaded Java programs is _____.

Accepted Answer

implementing the Runnable interface and defining its run() method

Answer

extending the Thread class and overriding the run() method

Answer

designing your own Thread class

Answer

using the CreateThread() function

Question 18

_________ involves distributing tasks across multiple computing cores.

Accepted Answer

Task parallelism

Answer

Concurrency

Answer

Data parallelism

Answer

Parallelism

Question 19

Grand Central Dispatch handles blocks by ____.

Accepted Answer

placing them on a dispatch queue

Answer

creating a new thread

Answer

placing them on a dispatch stack

Answer

constructing a parallel region

Question 20

An instruction that executes atomically ____.

Accepted Answer

executes as a single, uninterruptible unit

Answer

must consist of only one machine instruction

Answer

cannot be used to solve the critical section problem

Answer

all of the above

Question 21

In Peterson's solution, the ____ variable indicates if a process is ready to enter its critical section.

Accepted Answer

flag[i]

Answer

turn

Answer

lock

Answer

turn[i]

Question 22

What is the correct order of operations for protecting a critical section using mutex locks?

Accepted Answer

acquire() followed by release()

Answer

release() followed by acquire()

Answer

wait() followed by signal()

Answer

signal() followed by wait()

Question 23

Assume an adaptive mutex is used for accessing shared data on a Solaris system with multiprocessing capabilities. Which of the following statements is not true?

Accepted Answer

Condition variables and semaphores are never used in place of an adaptive mutex.

Answer

A waiting thread may spin while waiting for the lock to become available.

Answer

A waiting thread may sleep while waiting for the lock to become available.

Answer

The adaptive mutex is only used to protect short segments of code.

Question 24

Which of the following statements is true?

Accepted Answer

Counting semaphores can be used to control access to a resource with a finite number of instances.

Answer

A counting semaphore can never be used as a binary semaphore.

Answer

A binary semaphore can never be used as a counting semaphore.

Answer

Spinlocks can be used to prevent busy waiting in the implementation of semaphores.

Question 25

_____ is/are not a technique for managing critical sections in operating systems.

Accepted Answer

Peterson's solution

Answer

Preemptive kernel

Answer

Non-preemptive kernel

Answer

Semaphores

Question 26

Which of the following statements is true?

Accepted Answer

Operations on atomic integers do not require locking.

Answer

Operations on atomic integers do require additional locking.

Answer

Linux only provides the atomic_inc() and atomic_sub() operations.

Answer

Operations on atomic integers can be interrupted.

Question 27

The OpenMP #pragma omp critical directive ___________.

Accepted Answer

behaves much like a mutex lock

Answer

does not require programmers to identify critical sections

Answer

does not guarantee prevention of race conditions

Answer

is similar to functional languages

Question 28

Which of the following is true of multilevel queue scheduling?

Accepted Answer

Each queue has its own scheduling algorithm.

Answer

Processes can move between queues.

Answer

A queue cannot have absolute priority over lower-priority queues.

Answer

It is the most general CPU-scheduling algorithm.

Question 29

The Linux CFS scheduler identifies _____________ as the interval of time during which every runnable task should run at least once.

Accepted Answer

targeted latency

Answer

virtual run time

Answer

nice value

Answer

load balancing

Question 30

______ allows a thread to run on only one processor.

Accepted Answer

Processor affinity

Answer

Processor set

Answer

NUMA

Answer

Load balancing

Question 31

The two general approaches to load balancing are __________ and ____________.

Accepted Answer

push migration, pull migration

Answer

soft affinity, hard affinity

Answer

coarse-grained, fine-grained

Answer

soft real-time, hard real-time

Question 32

Which of the following would be an acceptable signal handling scheme for a multithreaded program?

Accepted Answer

All of the above

Answer

Deliver the signal to the thread to which the signal applies.

Answer

Deliver the signal to every thread in the process.

Answer

Deliver the signal to only certain threads in the process.

Question 33

The most common secondary storage device is ____.

Accepted Answer

magnetic disk

Answer

random access memory

Answer

solid state disks

Answer

tape drives

Operating Systems for Programmers - Module 2 - Post-Quiz

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