Deck 4: Threads

Question 1

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

Answer 1

True

Question 2

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

A) VISTA
B) TRIX
C) SOLARIS
D) LEOPARD

Answer 2

B

Question 3

_________ is a good example of an OS using a combined ULT/KLT approach.

A) TRIX
B) Windows
C) LINUX
D) Solaris

Answer 3

D

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

A) strand
B) process
C) string
D) trace

Question 9

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

Question 10

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.

Question 11

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 __________ .

A) task
B) resource
C) single-threaded approach
D) lightweight process

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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.

A) KLT
B) LWP
C) VAX
D) ULT

Question 17

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.

Question 18

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

Question 19

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

Question 20

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

Question 21

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

Question 22

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

Question 23

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

A) port
B) process
C) token
D) thread

Question 24

The __________ state is when the thread has terminated.

A) ZOMBIE
B) FREE
C) STOP
D) SLEEP

Question 25

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

A) Kernel
B) KLT
C) lightweight process
D) ULT

Question 26

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

A) Processes
B) Kernel threads
C) LWPs
D) ULTs

Question 27

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.

Question 28

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.

Question 29

A Windows process must contain at least _________ thread(s) to execute.

A) four
B) three
C) two
D) one

Question 30

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

A) Terminated
B) Standby
C) Transition
D) Waiting

Question 31

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

A) domain
B) strand
C) thread
D) message

Question 32

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

A) Multiprocess applications
B) Java applications
C) Multiinstance applications
D) Multithreaded native applications

Question 33

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

Question 34

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.

A) Times and timers
B) Uninterruptible
C) Stopped
D) Interruptible

Question 35

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

A) task
B) process
C) thread
D) token

Question 36

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

Question 37

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

Question 38

There are two broad categories of thread implementation: user-level threads (ULTs) and ________.

Question 39

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

Question 40

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

Question 41

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

Question 42

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.

Question 43

The basic form of communication between processes or threads in a microkernel operating system is _________ .

Question 44

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

Question 45

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