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Question 1 of 20 Quiz ID: 1

A semaphore _____________________.

can not be more than zero

can not drop below zero

can not be more than one

can not drop below one

Question 2 of 20 Quiz ID: 2

Thread-specific data is data that __________.

is copied and not shared with the parent process

is not associated with any process

is generated by the thread independent of the thread's process

has been modified by the thread, but not yet updated to the parent process

Question 3 of 20 Quiz ID: 3

When a user program performs a system call, it must first put the system call arguments onto the kernel stack and then run a special instruction to switch to kernel mode.

True

False

Only for privileged system calls

Only for I/O operations

Question 4 of 20 Quiz ID: 4

Microkernels use _____ for communication.

message passing

virtualization

shared memory

system calls

Question 5 of 20 Quiz ID: 5

Which statement about scheduling algorithms is most comprehensive?

Only shortest remaining time first scheduling may cause starvation

Only preemptive scheduling may cause starvation

Only round robin is better than FCFS in terms of response time

Shortest remaining time first scheduling may cause starvation, preemptive scheduling may cause starvation, and round robin is better than FCFS in terms of response time

Question 6 of 20 Quiz ID: 6

A microkernel is a kernel ____.

containing many components that are optimized to reduce resident memory size

that is stripped of all nonessential components

that is compiled to produce the smallest size possible when stored to disk

that is compressed before loading in order to reduce its resident memory size

Question 7 of 20 Quiz ID: 7

In multithreaded programs, the kernel informs an application about certain events using a procedure known as a(n) ____.

upcall

signal

event handler

pool

Question 8 of 20 Quiz ID: 8

System calls can be run in either user mode or kernel mode.

True

False

Only for file operations

Only for memory management

Question 9 of 20 Quiz ID: 9

A ________ provides an API for creating and managing threads.

thread library

multicore system

multithreading model

set of system calls

Question 10 of 20 Quiz ID: 10

What is the primary characteristic of user level threads?

are managed by a thread library

are scheduled by the operating system

must ultimately be mapped to an associated kernel-level thread

require kernel mode privileges to create

Question 11 of 20 Quiz ID: 11

When an external device becomes ready to be serviced by the processor the device sends a(n) _________ signal to the processor.

interrupt

halt

handler

access

Question 12 of 20 Quiz ID: 12

_____ provide(s) an interface to the services provided by an operating system.

System calls

Communication

Shared memory

Simulators

Question 13 of 20 Quiz ID: 13

A __________ is an entity corresponding to a user job or application that owns resources such as memory and open files.

thread

task

token

process

Question 14 of 20 Quiz ID: 14

Which of the following instructions should definitely be privileged and restricted to kernel mode?

Read the clock

Issue a trap instruction

Turn off interrupts

Switch from user to kernel mode

Question 15 of 20 Quiz ID: 15

Whenever the CPU becomes idle, the operating system must select one of the processes in the _____________ queue to be executed.

process

execution

waiting

ready

Question 16 of 20 Quiz ID: 16

_____ is not one of the major categories of system calls.

Security

Communications

Protection

Process control

Question 17 of 20 Quiz ID: 17

If a process is executing in its critical section, no other process can be executing in their critical section. This principle is called:

Mutual Exclusion

Race Condition

Deadlock Prevention

Starvation Avoidance

Question 18 of 20 Quiz ID: 18

The problem encountered when a process is perpetually denied the necessary resources is called:

Starvation

Circular Wait

Preemption

Deadlock

Question 19 of 20 Quiz ID: 19

The circular wait condition can be prevented by:

defining a circular order of requests

maintaining a linear order of request types

defining a linear order of resource types

none of these

Question 20 of 20 Quiz ID: 20

Which of the following is true regarding the relationship between processes and threads:

It takes less time to switch between two different processes than to switch between two threads within the same process

It takes less time to terminate a process than a thread

It takes far less time to create a new thread in an existing process than to create a new process

Process and thread operations take the same amount of time

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