Question 1

The One to One model allows

Accepted Answer

A) increased concurrency___________ 
B) decreased concurrency 
C) increased or decreased concurrency 
D) concurrency equivalent to other models 
A) increased concurrency___________ 
B) decreased concurrency 
C) increased or decreased concurrency 
D) concurrency equivalent to other models A

Question 2

The model in which one kernel thread is mapped to many user-level threads is called

Accepted Answer

A) many to one model 
B) one to many model 
C) many to many model 
D) one to one model 
A) many to one model 
B) one to many model 
C) many to many model 
D) one to one model A

Question 3

The register context and stacks of a thread are deallocated when the thread?

Accepted Answer

A) terminates 
B) blocks 
C) unblocks 
D) spawns 
A) terminates 
B) blocks 
C) unblocks 
D) spawns A

Question 4

Termination of the process terminates

Accepted Answer

A) first thread of the process 
B) first two threads of the process 
C) all threads within the process 
D) no thread within the process 
A) first thread of the process 
B) first two threads of the process 
C) all threads within the process 
D) no thread within the process

Question 5

Which of the following is the drawback of the One to One Model?

Accepted Answer

A) increased concurrency provided by this model 
B) decreased concurrency provided by this model 
C) creating so many threads at once can crash the system 
D) creating a user thread requires creating the corresponding kernel thread 
A) increased concurrency provided by this model 
B) decreased concurrency provided by this model 
C) creating so many threads at once can crash the system 
D) creating a user thread requires creating the corresponding kernel thread

Question 6

Which of the following is FALSE?

Accepted Answer

A) context switch time is longer for kernel level threads than for user level threads 
B) user level threads do not need any hardware support 
C) related kernel level threads can be scheduled on different processors in a multiprocessor system 
D) blocking one kernel level thread blocks all other related threads 
A) context switch time is longer for kernel level threads than for user level threads 
B) user level threads do not need any hardware support 
C) related kernel level threads can be scheduled on different processors in a multiprocessor system 
D) blocking one kernel level thread blocks all other related threads

Question 7

Thread synchronization is required because___________

Accepted Answer

A) all threads of a process share the same address space 
B) all threads of a process share the same global variables 
C) all threads of a process can share the same files 
D) all of the mentioned 
A) all threads of a process share the same address space 
B) all threads of a process share the same global variables 
C) all threads of a process can share the same files 
D) all of the mentioned

Question 8

The kernel is___________of user threads.

Accepted Answer

A) a part of 
B) the creator of 
C) unaware of 
D) aware of 
A) a part of 
B) the creator of 
C) unaware of 
D) aware of

Question 9

In the Many to One model, multiple threads are unable to run in parallel on multiprocessors because of___________

Accepted Answer

A) only one thread can access the kernel at a time 
B) many user threads have access to just one kernel thread 
C) there is only one kernel thread 
D) none of the mentioned 
A) only one thread can access the kernel at a time 
B) many user threads have access to just one kernel thread 
C) there is only one kernel thread 
D) none of the mentioned

Question 10

When the event for which a thread is blocked occurs?

Accepted Answer

A) thread moves to the ready queue 
B) thread remains blocked 
C) thread completes 
D) a new thread is provided 
A) thread moves to the ready queue 
B) thread remains blocked 
C) thread completes 
D) a new thread is provided

Question 11

The model in which one user-level thread is mapped to many kernel level threads is called___________

Accepted Answer

A) many to one model 
B) one to many model 
C) many to many model 
D) one to one model 
A) many to one model 
B) one to many model 
C) many to many model 
D) one to one model

Question 12

The time required to create a new thread in an existing process is___________

Accepted Answer

A) greater than the time required to create a new process 
B) less than the time required to create a new process 
C) equal to the time required to create a new process 
D) none of the mentioned 
A) greater than the time required to create a new process 
B) less than the time required to create a new process 
C) equal to the time required to create a new process 
D) none of the mentioned

Question 13

The jacketing technique is used to

Accepted Answer

A) convert a blocking system call into non blocking system call 
B) create a new thread 
C) communicate between threads 
D) terminate a thread 
A) convert a blocking system call into non blocking system call 
B) create a new thread 
C) communicate between threads 
D) terminate a thread

Question 14

When is the Many to One model at an advantage?

Accepted Answer

A) when the program does not need multithreading 
B) when the program has to be multi- threaded 
C) when there is a single processor 
D) none of the mentioned 
A) when the program does not need multithreading 
B) when the program has to be multi- threaded 
C) when there is a single processor 
D) none of the mentioned

Question 15

Multithreading on a multi - CPU machine

Accepted Answer

A) has multiple threads of execution___________ 
B) has a single thread of execution 
C) can have multiple or a single thread for execution 
D) none of the mentioned 
A) has multiple threads of execution___________ 
B) has a single thread of execution 
C) can have multiple or a single thread for execution 
D) none of the mentioned

Question 16

If a kernel thread performs a blocking system call,___________

Accepted Answer

A) the kernel can schedule another thread in the application for execution 
B) the kernel cannot schedule another thread in the same application for execution 
C) the kernel must schedule another thread of a different application for execution 
D) the kernel must schedule another thread of the same application on a different processor 
A) the kernel can schedule another thread in the application for execution 
B) the kernel cannot schedule another thread in the same application for execution 
C) the kernel must schedule another thread of a different application for execution 
D) the kernel must schedule another thread of the same application on a different processor

Question 17

In the Many to One model, if a thread makes a blocking system call___________

Accepted Answer

A) the entire process will be blocked 
B) a part of the process will stay blocked, with the rest running 
C) the entire process will run 
D) none of the mentioned 
A) the entire process will be blocked 
B) a part of the process will stay blocked, with the rest running 
C) the entire process will run 
D) none of the mentioned

Question 18

Which one of the following is not a valid state of a thread?

Accepted Answer

A) running 
B) parsing 
C) ready 
D) blocked 
A) running 
B) parsing 
C) ready 
D) blocked

Question 19

Resource sharing helps___________

Accepted Answer

A) share the memory and resources of the process to which the threads belong 
B) an application have several different threads of activity all within the same address space 
C) reduce the address space that a process could potentially use 
D) all of the mentioned 
A) share the memory and resources of the process to which the threads belong 
B) an application have several different threads of activity all within the same address space 
C) reduce the address space that a process could potentially use 
D) all of the mentioned

Question 20

Because the kernel thread management is done by the Operating System itself

Accepted Answer

A) kernel threads are faster to create than user threads 
B) kernel threads are slower to create than user threads 
C) kernel threads are easier to manage as well as create then user threads 
D) none of the mentioned 
A) kernel threads are faster to create than user threads 
B) kernel threads are slower to create than user threads 
C) kernel threads are easier to manage as well as create then user threads 
D) none of the mentioned

Exam 22: Thread Management and Synchronization in Operating Systems

The One to One model allows

The model in which one kernel thread is mapped to many user-level threads is called

The register context and stacks of a thread are deallocated when the thread?

Termination of the process terminates

Which of the following is the drawback of the One to One Model?

Which of the following is FALSE?

Thread synchronization is required because___________

The kernel is___________of user threads.

In the Many to One model, multiple threads are unable to run in parallel on multiprocessors because of___________

When the event for which a thread is blocked occurs?

The model in which one user-level thread is mapped to many kernel level threads is called___________

The time required to create a new thread in an existing process is___________

The jacketing technique is used to

When is the Many to One model at an advantage?

Multithreading on a multi - CPU machine

If a kernel thread performs a blocking system call,___________

In the Many to One model, if a thread makes a blocking system call___________

Which one of the following is not a valid state of a thread?

Resource sharing helps___________

Because the kernel thread management is done by the Operating System itself

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