Recent questions tagged threads

Recent questions tagged threads

7 votes

3 answers

1

GATE CSE 2021 Set 2 | Question: 42
Consider the following multi-threaded code segment (in a mix of C and pseudo-code), invoked by two processes $P_1$ and $P_2$, and each of the processes spawns two threads $T_1$ and $T_2$: int x = 0; // global Lock L1; // global main () { create a ... the value of $y$ as $2.$ Both $T_1$ and $T_2$, in both the processes, will print the value of $y$ as $1.$

Arjun asked in Operating System Feb 18

by Arjun

2.2k views

4 votes

2 answers

2

OS NPTEL ASSIGNMENT QUESTION
Degree of concurrency in threads can be arranged in the manner One-to-one > many-to-one > many-to-many One-to-one > many-to-many > many-to-one Many-to-many > many-to-one > one-to-one None of the above answer given is A but according to me answer is B. Someone please confirm

Akanksha Agrawal asked in Unknown Category Sep 7, 2020

by Akanksha Agrawal

626 views

0 votes

2 answers

3

NIELIT 2017 OCT Scientific Assistant A (IT) - Section B: 23
Which two are valid constructions for Thread? Thread(Runnable r, String name) Thread() Thread(int priority) Thread(Runnable r, ThreadGroup g) Thread(Runnable r, int priority) $1$ and $3$ $2$ and $4$ $1$ and $2$ $2$ and $5$

Lakshman Patel RJIT asked in Operating System Apr 1, 2020

by Lakshman Patel RJIT

351 views

2 votes

4 answers

4

NIELIT 2017 DEC Scientific Assistant A - Section B: 9
Operating System maintains the page table for : each process each thread each instruction each address

Lakshman Patel RJIT asked in Operating System Mar 31, 2020

by Lakshman Patel RJIT

7.9k views

1 vote

3 answers

5

UGCNET-Jan2017-III: 53
One of the disadvantages of user level threads compared to Kernel level thread is If a user level thread of a process executes a system call, all threads in that process are blocked. Scheduling is application dependent. Thread switching doesn’t require kernel mode privileges. The library procedures invoked for thread management in user level threads are local procedures.

jothee asked in Operating System Mar 24, 2020

by jothee

574 views

0 votes

0 answers

6

Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 53 (Page No. 178)
Consider a system in which it is desired to separate policy and mechanism for the scheduling of kernel threads. Propose a means of achieving this goal.

Lakshman Patel RJIT asked in Operating System Oct 25, 2019

by Lakshman Patel RJIT

359 views

0 votes

1 answer

7

Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 27 (Page No. 175)
In a system with threads, is there one stack per thread or one stack per process when user-level threads are used? What about when kernel-level threads are used? Explain.

Lakshman Patel RJIT asked in Operating System Oct 25, 2019

by Lakshman Patel RJIT

238 views

0 votes

1 answer

8

Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 11 (Page No. 174)
If a multithreaded process forks, a problem occurs if the child gets copies of all the parent’s threads. Suppose that one of the original threads was waiting for keyboard input. Now two threads are waiting for keyboard input, one in each process. Does this problem ever occur in single-threaded processes?

Lakshman Patel RJIT asked in Operating System Oct 24, 2019

by Lakshman Patel RJIT

316 views

0 votes

0 answers

9

Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 9 (Page No. 174)
Assume that you are trying to download a large $2$-GB file from the Internet. The file is available from a set of mirror servers, each of which can deliver a subset of the file's bytes; assume that a ... request specifies the starting and ending bytes of the file. Explain how you might use threads to improve the download time.

Lakshman Patel RJIT asked in Operating System Oct 24, 2019

by Lakshman Patel RJIT

280 views

0 votes

1 answer

10

Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 4 (Page No. 174)
When an interrupt or a system call transfers control to the operating system, a kernel stack area separate from the stack of the interrupted process is generally used. Why?

Lakshman Patel RJIT asked in Operating System Oct 24, 2019

by Lakshman Patel RJIT

346 views

0 votes

0 answers

11

Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 13 (Page No. 82)
Consider a system that has two CPUs, each CPU having two threads (hyperthreading). Suppose three programs, $P0, P1,$ and $P2$, are started with run times of $5, 10$ and $20$ msec, respectively. How long will it ... all three programs are $100\%$ CPU bound, do not block during execution, and do not change CPUs once assigned.

Lakshman Patel RJIT asked in Operating System Oct 23, 2019

by Lakshman Patel RJIT

97 views

2 votes

2 answers

12

UGCNET-June-2019-II: 44
Which of the following are NOT shared by the threads of the same process? Stack Registers Address space Message queue a and d b and c a and b a, b and c

Arjun asked in Operating System Jul 2, 2019

by Arjun

1.2k views

2 votes

1 answer

13

IISc CSA Written Test 2019
Given that a computer system has only 3 process.1st process is single threaded, 2nd process is two threaded and 3rd process is 4 threaded.So total how many number of page tables will be managed by the operating system?

Sourajit25 asked in Operating System Jun 4, 2019

374 views

0 votes

0 answers

14

Self Doubt:Operating System-Threads
User level threads doesnot require context switching- This is a true statement (Because OS cannot recognize user level threads) Can somebody elaborate more on it?? This given answer is wrong I think:https://gateoverflow.in/290648/made_easy_test_series Plz check

srestha asked in Operating System May 19, 2019

306 views

0 votes

2 answers

15

Galvin Edition 9 Exercise 9 Question 36 (Page No. 456)
A system provides support for user-level and kernel-level threads. The mapping in this system is one to one (there is a corresponding kernel thread for each user thread). Does a multithreaded process consist of $(a)$ a working set for the entire process or $(b)$ a working set for each thread ? Explain

akash.dinkar12 asked in Operating System Mar 22, 2019

by akash.dinkar12

291 views

0 votes

3 answers

16

Galvin Edition 9 Exercise 4 Question 15 (Page No. 193)
Consider the following code segment: pid t pid; pid = fork(); if (pid == 0) { /* child process */ fork(); thread create( . . .); } fork(); a. How many unique processes are created? b. How many unique threads are created?

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

413 views

0 votes

0 answers

17

Galvin Edition 9 Exercise 4 Question 14 (Page No. 192-193)
A system with two dual-core processors has four processors available for scheduling. A CPU-intensive application is running on this system. All input is performed at program start-up, when a single file must be opened. Similarly, ... ? Explain. How many threads will you create for the CPU-intensive portion of the application ? Explain.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

251 views

0 votes

1 answer

18

Galvin Edition 9 Exercise 4 Question 12 (Page No. 192)
Using Amdahl’s Law, calculate the speedup gain of an application that has a 60 percent parallel component for (a) two processing cores and (b) four processing cores.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

1.3k views

0 votes

1 answer

19

Galvin Edition 9 Exercise 4 Question 11 (Page No. 192)
Is it possible to have concurrency but not parallelism ? Explain.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

239 views

1 vote

2 answers

20

Galvin Edition 9 Exercise 4 Question 9 (Page No. 192)
Can a multithreaded solution using multiple user-level threads achieve better performance on a multiprocessor system than on a single processor system ? Explain.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

178 views

1 vote

1 answer

21

Galvin Edition 9 Exercise 4 Question 8 (Page No. 192)
Which of the following components of program state are shared across threads in a multithreaded process ? a. Register values b. Heap memory c. Global variables d. Stack memory

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

1.5k views

0 votes

0 answers

22

Galvin Edition 9 Exercise 4 Question 7 (Page No. 192)
Under what circumstances does a multithreaded solution using multiple kernel threads provide better performance than a single-threaded solution on a single-processor system ?

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

89 views

0 votes

0 answers

23

Galvin Edition 9 Exercise 4 Question 6 (Page No. 192)
Provide two programming examples in which multithreading does not provide better performance than a single-threaded solution.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

84 views

0 votes

0 answers

24

Galvin Edition 9 Exercise 4 Question 5 (Page No. 192)
Assume that an operating system maps user-level threads to the kernel using the many-to-many model and that the mapping is done through LWPs(Light Weight Processes). Furthermore, the system allows developers to create real-time threads for ... real-time systems. Is it necessary to bind a real-time thread to an LWP(Light Weight Process) ?Explain.

akash.dinkar12 asked in Operating System Mar 19, 2019

by akash.dinkar12

128 views

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