Recent questions tagged threads

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1

Threads
According to me Answer is C, because Multithreading i.e. User application threads cannot use different processors because processor see all the thread of user process as part of one process so it wont execute on Different Processors. Am i right ? But answer given is (A)

asked Jul 12 in Operating System by Na462 Active (4.5k points) | 52 views

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2

Thread
A multithreaded application can't make use of multiprocessor system simultaneously,because OS sees only a single process and will not schedule the thread on different processor. But when we talk about data and task parallelism then we execute them on different ... processes because threads of same processes can't be executed in a multiprocessor system. Please clear my Doubt Here????

asked Jul 1 in Operating System by Na462 Active (4.5k points) | 36 views

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0 answers

3

PGEE sample paper question on threads
I think options A, D and E are wrong; B is true. I'm not sure about C. I think it should be true because page table is created for a process and not for its threads so page table should be shared among threads of a same process.

asked Apr 14 in Operating System by Akhilesh Singla Active (4.7k points) | 130 views

+2 votes

1 answer

4

Doubt Threads Scheduling
How are user level threads scheduled?

asked Jan 27 in Operating System by _jerry (353 points) | 85 views

+4 votes

0 answers

5

Self Doubt Context Switching Threads
S1: Context Switching occurs only in kernel mode. :TRUE S2: Context Switching in user mode is faster as compared to context switching in kernel mode. : TRUE If Context Switching occurs only in kernel mode, then how is CS in user mode faster ... switching and then change back to user mode which means more time should be taken as compared to CS in kernel mode.

asked Jan 26 in Operating System by _jerry (353 points) | 74 views

+3 votes

0 answers

6

Theads
True/False : 1)Several threads can share same physical address space. 2)Several threads can share same virtual address space.

asked Jan 16 in Operating System by VS Loyal (8.9k points) | 173 views

+1 vote

2 answers

7

Threads
The primary difference between process and thread ? (A) The number of I/O requests mode. (B) The amount of overhead associated with creation and context switching . (C) The amount of memory allocation (D) The average number of instructions executed

asked Dec 14, 2017 in Operating System by ankitgupta.1729 Loyal (6.6k points) | 151 views

+1 vote

2 answers

8

OS:- Threads
Why threads have less context than process? Context means various attributes that we store in the PCB,so the attributes like state,property,PC,etc.. should be there in both process and thread.So,how thread have less context than process?

asked Dec 6, 2017 in Operating System by rahul sharma 5 Boss (24.5k points) | 104 views

0 votes

0 answers

9

Threads
Threads of a process share (A) global variables but not heap (B) heap but not global variables (C) neither global variables nor heap (D) both heap and global variables My doubt is thread does share code section , data section and files. So global variables it does share bt does it also share heap section?

asked Oct 29, 2017 in Operating System by Na462 Active (4.5k points) | 133 views

0 votes

1 answer

10

threads
Multi-threaded application cannot take advantage of multiprocessing. What does this mean?

asked Sep 18, 2017 in Operating System by Parshu gate Active (4.9k points) | 151 views

+1 vote

1 answer

11

Deadlocks and threads
Which one of the following is false about user threads 1. User threads can switch fast since it does noy invoke kernel 2.user threads are light weight since they do not require system call 3.kernel is not aware of the behavior of every user threads ie if it is blocking or run able 4.none of these

asked Sep 13, 2017 in Operating System by Suman Acharya (115 points) | 240 views

0 votes

1 answer

12

Deadlocks and threads
State true or false A program to compute the sum of first 10000 numbers can be divided into 4 sub parts and executed on 4 CPUs using either forks/threads. The reason why we prefer threads is because large portions of the data /code between the 4 subparts are very similar and need not duplicated. A. True B. False

asked Sep 12, 2017 in Operating System by Suman Acharya (115 points) | 226 views

0 votes

1 answer

13

threads and subprocess
I am getting confused with the implementation of threads..... as we know if some task is assigned to process it can divide the task into subprocess and implement it efficiently...if it is so , why there is need of the concept multithreading? plz explain it clearly if possible

asked Aug 12, 2017 in Operating System by vamp_vaibhav Active (3.3k points) | 122 views

+3 votes

2 answers

14

Primary difference between process and thread.

asked Aug 11, 2017 in Operating System by Xylene Active (3.8k points) | 301 views

+3 votes

2 answers

15

Self Doubt
Whether the following statement is true or false?? "The OS maintains scheduling and accounting information for each thread"

asked Aug 4, 2017 in Operating System by akb1115 Active (3.1k points) | 150 views

+9 votes

2 answers

16

#THREADS
if(fork() && fork()) { fork(); } if(fork()||fork()) { fork(); fork(); } printf("XYZ"); How many time XYZ gets printed ?

asked Jul 13, 2017 in Operating System by junaid ahmad Loyal (9k points) | 231 views

+10 votes

4 answers

17

#threads
int main() { if(fork() == 0) printf("GATE2018"); if(fork() == 0) printf("GATE2018"); } How many times GATE2018 printed?

asked Jul 13, 2017 in Operating System by junaid ahmad Loyal (9k points) | 216 views

+4 votes

2 answers

18

Galvin 4.5
Can a multithreaded solution using multiple user-level threads achieve betterperformance on amultiprocessor system than on a single-processor system?

asked Jun 23, 2017 in Operating System by reena_kandari Loyal (7.6k points) | 523 views

+26 votes

6 answers

19

GATE2017-1-18
Threads of a process share global variables but not heap heap but not global variables neither global variables nor heap both heap and global variables

asked Feb 14, 2017 in Operating System by Arjun Veteran (355k points) | 4.1k views

+18 votes

4 answers

20

GATE2017-2-07
Which of the following is/are shared by all the threads in a process? Program counter Stack Address space Registers (I) and (II) only (III) only (IV) only (III) and (IV) only

asked Feb 14, 2017 in Operating System by Madhav Active (2k points) | 2.6k views

+5 votes

0 answers

21

Threading in OS [GateBook]

asked Jan 24, 2017 in Operating System by biranchi Active (1.5k points) | 220 views

+1 vote

2 answers

22

can user level threads be scheduled on different processors in a multi-processor system.??

asked Jan 5, 2017 in Operating System by sushmita Boss (13.6k points) | 433 views

+2 votes

3 answers

23

made easy qq

asked Dec 23, 2016 in Operating System by Vishal Goyal Active (1.9k points) | 301 views

+8 votes

3 answers

24

user and kernel mdoe
can anyone tell what are different activities that are performed in kernel mode user mode how to change frm user mode to kernel mode and vice-versa,,

asked Dec 20, 2016 in Operating System by Akriti sood Boss (13.6k points) | 446 views

+5 votes

2 answers

25

User|Kernel threads
Assume that process A has 3 user level threads and process B has 4 kernel-level threads. Consider while process A is running in CPU, process B is waiting in ready queue. If one of the thread in A is blocked then find status of A threads and B threads? A. ... A threads are blocked and B threads are not blocked. C. All B threads are blocked and A threads are not blocked. D. None.

asked Sep 20, 2016 in Operating System by vijaycs Boss (25.8k points) | 338 views

+4 votes

1 answer

26

Process and Thread
If a process has multiple threads and it calls a fork() then will the child process be multi-threaded also or it will have only one thread?

asked Aug 2, 2016 in Operating System by Mandeep Singh Active (1.5k points) | 420 views

+3 votes

2 answers

27

UGCNET-Dec2013-III-75
Possible thread states in Windows 2000 operating system include: Ready, running and waiting Ready, standby, running, waiting, transition and terminated Ready, running, waiting, transition and terminated Standby, running, waiting, transition and terminated

asked Jul 29, 2016 in Operating System by jothee Veteran (99.8k points) | 518 views

+8 votes

2 answers

28

Thread
Q:which of the following can run in parallel on different processors in a multiprocessors a)user level thread b)kernel level thread c)processes d) processes and kernel level thread

asked Jul 16, 2016 in Operating System by Anjali_aspirant Junior (999 points) | 663 views

+2 votes

2 answers

29

UGCNET-Dec2012-III-32
A thread is a light weight process. In the above statement, weight refers to time number of resources speed all of the above

asked Jul 12, 2016 in Operating System by jothee Veteran (99.8k points) | 717 views

+3 votes

3 answers

30

What is executed by the processor? What is in ready queue? Process or thread?

asked Jun 12, 2015 in Operating System by Aayush Mittal (57 points) | 738 views

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