Chap 4

Question 1

The OS performs a protection function to prevent unwanted interference between processes with respect to resources.

Answer 1

TRUE

Question 2

Windows process design is driven by the need to provide support for a variety of OS environments.

Answer 2

TRUE

Question 3

The unit of dispatching is usually referred to as a process or task.

Answer 3

FALSE

Question 4

In a multithreaded environment there are separate stacks for each thread, as well as a separate control block for each thread.

Answer 4

TRUE

Question 5

It takes less time to terminate a process than a thread.

Answer 5

FALSE

Question 6

If there is an application or function that should be implemented as a set of related units of execution, it is far more efficient to do so as a collection of separate processes rather than a collection of threads.

Answer 6

FALSE

Question 7

An example of an application that could make use of threads is a file server.

Answer 7

TRUE

Question 8

Termination of a process does not terminate all threads within that process.

Answer 8

FALSE

Question 9

If a process is swapped out, all of its threads are necessarily swapped out because they all share the address space of the process.

Answer 9

TRUE

Question 10

On a uniprocessor, multiprogramming does not enable the interleaving of multiple threads within multiple processes.

Answer 10

FALSE

Question 11

Any alteration of a resource by one thread affects the environment of the other threads in the same process.

Answer 11

TRUE

Question 12

In a pure ULT facility, all of the work of thread management is done by the application, and the kernel is not aware of the existence of threads.

Answer 12

TRUE

Question 13

As a default, the kernel dispatcher uses the policy of hard affinity in assigning threads to processors.

Answer 13

FALSE

Question 14

Windows is an example of a kernel-level thread approach.

Answer 14

TRUE

Question 15

The potential performance benefits of a multicore organization depend on the ability to effectively exploit the parallel resources available to the application.

Answer 15

TRUE

Question 16

The traditional approach of a single thread of execution per process, in which the concept of a thread is not recognized, is referred to as a ______________.

Answer 16

single-threaded approach

Question 17

The idea of having a many-to-many relationship between threads and processes has been explored in the experimental operating system ___________.

Answer 17

TRIX

Question 18

In a multithreaded environment, a _________ is defined as the unit of resource allocation and a unit of protection.

Answer 18

process

Question 19

The principal disadvantage of the _______ approach is that the transfer of control from one thread to another within the same process requires a mode switch to the kernel.

Answer 19

kernel-level thread

Question 20

_________ is a good example of an OS using a combined user-level and kernel-level thread approach.

Answer 20

Solaris

Question 21

A _______ is a single execution path with an execution stack, processor state, and scheduling information.

Answer 21

thread

Question 22

_________ are characterized by the presence of many single-threaded processes.

Answer 22

multiprocess applications

Question 23

A _______ is a dispatchable unit of work that executes sequentially and is interruptible so that the processor can turn to another thread.

Answer 23

thread

Question 24

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

Answer 24

process

Question 25

A ________ is a user-created unit of execution within a process.

Answer 25

user-level thread

Question 26

A windows process must contain at least ________ thread(s) to execute.

Answer 26

1

Question 27

A thread enters the ________ state, after waiting, if it is ready to run but the resources are not available.

Answer 27

transition

Question 28

The _________ are the fundamental entities that can be scheduled and dispatched to run on one of the system processors.

Answer 28

Kernel threads

Question 29

The _______ state is when the thread has terminated.

Answer 29

ZOMBIE

Question 30

The blocked state in which the process is waiting for an event, such as the end of an I/O operation, the availability of a resource, or a signal from another process is the __________ state.

Answer 30

interruptible

Question 31

The _______ is the collection of program, data, stack, and attributes defined in the process control block.

Answer 31

process image

Question 32

________ refers to the ability of an OS to support multiple, concurrent paths of execution within a single process.

Answer 32

Multithreading

Question 33

The key states for a thread are: Running, ________, and Blocked.

Answer 33

Ready

Question 34

There are four basic thread operations associated with a change in thread state: Block, Unblock, Finish, and ________.

Answer 34

Spawn

Question 35

There are two broad categories of thread implementation: user-level threads and ____________.

Answer 35

kernel-level threads

Question 36

A way to overcome the problem of blocking threads is to use a technology referred to as __________, which converts a blocking system call into a nonblocking system call.

Answer 36

jacketing

Question 37

A __________ is a static entity, consisting of an address space and ports through which messages may be sent and received.

Answer 37

domain

Question 38

Windows makes use of two types of process-related objects: processes and __________.

Answer 38

threads

Question 39

The _________ Windows Process Object Attribute describes who created an object, who can gain access to or use the object, and who is denied access to the object.

Answer 39

security descriptor

Question 40

The six states of a Windows thread are: Ready, Standby, Running, Waiting, Transition, and ___________.

Answer 40

Terminated

Question 41

Most operating systems contain two fundamental forms of concurrent activity: processes and ____________.

Answer 41

interrupts

Question 42

A process or task in Linux is represented by a ___________ data structure.

Answer 42

task_struct

Question 43

The Clouds operating system implements the concept of a thread as primarily an entity that can move among address spaces which represents the ___________ Thread-to-Process relationship.

Answer 43

One-to-Many

Question 44

It is necessary to ___________ the activities of various threads so they do not interfere with each other or corrupt data structures.

Answer 44

synchronize

Question 45

The basic form of communication between processes or threads in a micro kernel operating system is ___________.

Answer 45

messages