Recent questions tagged threads

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1

Made Easy Test Series
Consider the following statements: S1: Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user. S2: If a user-level-thread is blocked for I/O operation, then kernel of OS will perform context ... . Which of the following is true? Only S1 & S2 Only S2 & S3 Only S1 & S3 None of these

asked Dec 9 in Operating System by balraj_allam (71 points) | 18 views

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2

Threads
Which of the following is not a reason to create threads? A)To achieve true CPU concurrency B)Creating a new process is costly C)Communication between processes must go through operating system D)The process as a whole gets one time slice irrespective of the no of threads it has

asked Dec 7 in Operating System by minal Boss (16k points) | 49 views

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3

Threads
Consider following statements given below : S1 : User level thread does not require context switching. S2 : VM increases context switching overhead. Which of the following statements are TRUE ?

asked Dec 4 in Operating System by Na462 Loyal (7.5k points) | 55 views

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4

Interprocess Communication
Consider the following statements: S1 : Interprocess communication and sharing is easier in process rather than threads. S2 : There is no protection between threads of same process. Which of the following statements are Valid ?

asked Dec 2 in Operating System by Na462 Loyal (7.5k points) | 34 views

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5

Threads
Consider the following statements: S1 : Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user. S2 : If a user-level thread is blocked for I/O operation, then kernel of ... several userlevel threads to be assigned to different processors in a multi-processor computer system. Which of the following is true?

asked Nov 26 in Operating System by Shivangi Parashar 2 (301 points) | 26 views

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0 answers

6

Kernal level vs User level thread
Consider two processes X having P threads and Y having Q threads with equal time slices respectively.Threads are mixed with user level threads (ULT) and kernel level threads (KLT) with P > Q. Now consider the following statements I) If all threads are user level threads ... . III only 2. II and III only 3. I and II only 4.I, II and III How statement-1 Is true??

asked Nov 10 in Operating System by Sandy Sharma Active (1.1k points) | 34 views

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1 answer

7

threads
there is no protection between the threads of same process why ?

asked Nov 8 in Operating System by Gurdeep Saini Loyal (5.2k points) | 79 views

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0 answers

8

Gate Practice
Please explain the question given below.

asked Oct 26 in Operating System by Abhisek Saha (139 points) | 65 views

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0 answers

9

#Threads #OS True/False statements
for kernel-level threads, a system call can block the entire process. User level threads can be scheduled independently. Kernel level threads are transparent to the user level threads. Which of them is True?

asked Oct 12 in Operating System by iarnav Loyal (9.3k points) | 39 views

0 votes

1 answer

10

OS doubt
Explain how.. Context Switch overhead is less in thread based systems compared to process based systems.

asked Sep 23 in Operating System by Naveen Kumar 3 Active (2.8k points) | 29 views

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0 answers

11

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 Loyal (7.5k points) | 107 views

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12

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 Loyal (7.5k points) | 50 views

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0 answers

13

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 (4.8k points) | 144 views

+2 votes

1 answer

14

Doubt Threads Scheduling
How are user level threads scheduled?

asked Jan 27 in Operating System by _jerry (353 points) | 108 views

+4 votes

0 answers

15

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) | 112 views

+3 votes

0 answers

16

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 (9.5k points) | 205 views

+1 vote

2 answers

17

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 (8.4k points) | 171 views

+1 vote

2 answers

18

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 (25.9k points) | 128 views

0 votes

0 answers

19

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 Loyal (7.5k points) | 149 views

0 votes

1 answer

20

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

asked Sep 18, 2017 in Operating System by Parshu gate Active (5k points) | 168 views

+1 vote

1 answer

21

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) | 255 views

0 votes

1 answer

22

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) | 238 views

0 votes

1 answer

23

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 (3.5k points) | 138 views

+3 votes

2 answers

24

Primary difference between process and thread.

asked Aug 11, 2017 in Operating System by Xylene Active (3.9k points) | 348 views

+3 votes

2 answers

25

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 (3.3k points) | 161 views

+9 votes

2 answers

26

#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 (9.2k points) | 257 views

+10 votes

4 answers

27

#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 (9.2k points) | 239 views

+4 votes

2 answers

28

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 (8.2k points) | 608 views

+27 votes

6 answers

29

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 (369k points) | 4.5k views

+19 votes

4 answers

30

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) | 2.8k views

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