Question

QUESTION 19

1. Explain Many-to-many thread mapping techniques and write-down advantage and disadvantage.

QUESTION 20

1. Convoy effect is condition when long processes are scheduled to be after the short processes.

   True

   False

1 points   

QUESTION 21

1. Threads can share files and stacks

   True

   False

1 points   

QUESTION 22

1. A process in the waiting queue can start running immediately after it receives the response from IO devices.

   True

   False

1 points   

QUESTION 23

1. A computer cannot understand source code and directly executes it

   True

   False

1 points   

QUESTION 24

1. ______________ is one of the multi-threading benefits that allows the whole program to run when one or some of threads are blocked.

1 points   

QUESTION 25

1. Which statement is true.

   		All process must be single-threaded
   		A process cannot be only single-threaded
   		A single thread cannot be a process
   		None of them

Answer 1

SOLUTION-(19):-

Many-to-many thread mapping technique :-  In the many-to-many thread mapping technique, ​​​​​​​ the process is allocated M number of kernel-level threads in order to execute N number of user-level threads. Here, multiplexing is done between many user-level threads to a short or identical number of kernel threads. The total number of kernel threads may be exclusive to either a specific application or a specific machine that means an application can be allocated more kernel threads on a multiprocessor rather than on a single processor. Developers can generate as many user threads as required, and the corresponding kernel threads can execute in parallel on a multiprocessor.

Advantages :
(1) It gives permission for many user level threads to be mapped to
many kernel threads.
(2) It permits the operating system to create a adequate number of kernel threads.

Disadvantage : It is more intricate to implement.

SOLUTION-(20):- FALSE

EXPLANATION:- In Convey effect, short process behind long process and will be waiting for the long process to finish.

SOLUTION-(21):- FALSE

EXPLANATION:- Threads can share data and code segments but can not share stack because every thread have its own stack for pusing/popping the contents of program counter.

SOLUTION-(22):- FALSE

EXPLANATION:- When an I/O action is finished for a process that requested it and the process now will move from the waiting to the ready state. Now, scheduler can take a decision to preempt the currently-running process and move this newly-ready process into the running state. Therefore, It is clear that a process in the waiting queue can not start running immediately after it receives the response from IO devices so the given statement is FALSE.

SOLUTION-(23):- FALSE

EXPLANATION:- Source code can be understand by people/programmer but cannot be executed directly until it is translated into machine code by compiler, therefore the given statement is FALSE.

SOLUTION-(24):- Responsiveness is one of the multi-threading benefits that allows the whole program to run when one or some of threads are blocked.

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