Recent questions and answers in Operating System
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Recent questions and answers in Operating System

Recent questions and answers in Operating System
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0 answers 51 views
made easy test series
which of the following statement is /are correct for deadlock avoidance algorithm? (a) every unsafe system leads to deadlock (b) every deadlock system implies unsafe © safe system at some point of time can lead to deadlock (d) unsafe system at some point of time can never result in safe state
omshiv asked in Operating System Dec 23, 2021
by omshiv
5 points
51 views
0 votes
0 answers 33 views
made easy test series
consider a disk has 150 cylinders numbered from 0 to 149. currently the disk arm is at 80 and moving towards higher cylinders. there is disk access requests for cylinders are 30, 78, 96, 123, 141 ,15, 13, 68. what will be the absolute difference traversed by R/w head whwn CSCAN and CLOOK is used?
omshiv asked in Operating System Dec 23, 2021
by omshiv
5 points
33 views
0 votes
0 answers 32 views
made easy test series
consider a disk has 150 cylinders numbered from 0 to 149. currently the disk arm is at 80 and moving towards higher cylinders. there is disk access requests for cylinders are 30, 78, 96, 123, 141 ,15, 13, 68. what will be the absolute difference traversed by R/w head whwn CSCAN and CLOOK is used?
omshiv asked in Operating System Dec 23, 2021
by omshiv
5 points
32 views
0 votes
0 answers 85 views
MadeEasy 2022 OS question on concept of semaphores.
neel19 asked in Operating System Dec 3, 2021
by neel19
9 points
85 views
0 votes
0 answers 39 views
Operating system
Some computer systems do not provide a privileged mode of operation in hardware. Is it possible to construct a secure operating system for these computer systems? Give arguments both that it is and that it is not possible.
Abubakar787 asked in Operating System Aug 24, 2021
by Abubakar787
5 points
39 views
0 votes
0 answers 53 views
ace workbook
which interrupt is needed to change the mode from non-privileged to privileged.? A hardware interrupt A software interrupt A privileged instruction (which doesn’t generate an interrupt) is needed A non-privileged instruction (which doesn’t generate an interrupt) is needed
Jeel Dasvani asked in Operating System Aug 24, 2021
by Jeel Dasvani
5 points
53 views
0 votes
0 answers 16 views
# self doubt
I think answer should be false, as Peterson solution and strict alteration solution are user-mode solutions to critical section problem. i read somewhere that strict alteration and peterson solution will only work on preemptive scheduling. is it true? and if it is true than does it affect answer to the asked question ?
i_ronak asked in Operating System Aug 23, 2021
by i_ronak
5 points
16 views
0 votes
0 answers 42 views
# self doubt
please explain what is the problem with hardware synchronization that software can cure. Is it locking the other cores on multicore processor.
i_ronak asked in Operating System Aug 21, 2021
by i_ronak
5 points
42 views
0 votes
0 answers 42 views
Operating system: partitioning topic, self made question
Autumn asked in Operating System Aug 19, 2021
by Autumn
71 points
42 views
0 votes
0 answers 84 views
Peterson algorithm process synchronisation
How Peterson algorithm satisfies the progress requirement. As we can see when process P1 execute first and initially turn = 1 and both flags are False. After P1 execute till instruction 2 (i.e. flag[1]=true and turn = 2) preemption ... As both the condition are true then process p1 will wait for p2. Iam not understanding how progress will work here.?
Sahiltam asked in Operating System Aug 18, 2021
by Sahiltam
5 points
84 views
0 votes
0 answers 37 views
OS homework
Hi, can someone draw me a proccesses tree by PID (PID of the first one is 2) to that program? and what are the possible outputs? Thank you, im a beginner. int i = 1; if (fork()) { ++i; fork(); } else if (fork()) { ++i; } printf("%d", i);
Benny430 asked in Operating System Aug 13, 2021
by Benny430
5 points
37 views
0 votes
0 answers 73 views
NPTEL OS Assignment Question Self Doubt
According to me the answer should be c , as the buffer is unbounded . There shoud be no need no use a full semaphore , if the buffer is unbounded . Am i right ?
hari0943 asked in Operating System Aug 7, 2021
by hari0943
9 points
73 views
0 votes
0 answers 46 views
Virtual Memory Management - Question from book Dietel
Ranjul Bandyopadhyay asked in Operating System Aug 3, 2021
by Ranjul Bandyopadhyay
7 points
46 views
0 votes
0 answers 48 views
ISI Entrance
Let s and t be two semaphores initialised to 1 and 0, respectively. Two threads T1 and T2 each execute the code shown below. 1: P(s) 2: V(s) 3: P(t) 4: V(t) (i) Does there exist an interleaving for which at least one of the ... justify your answer. (ii) What change(s) in the initial values assigned to the semaphores will guarantee that both threads will always progress to completion?
kauray asked in Operating System Aug 2, 2021
by kauray
5 points
48 views
0 votes
0 answers 70 views
Self doubt memory management
Logical add= segment no.+ Offset my question is offset calculation how does it
afroze asked in Operating System Jul 21, 2021
by afroze
7 points
70 views
0 votes
0 answers 81 views
Galvin 7th edition page 350
Using a page size of 4 bytes and a physical memory of 32 bytes (8 pages)! we show how the user's view of memory can be mapped into physical memory. Logical address 0 is page O! offset O. Indexing into the page table! we find that page 0 is in frame ... mapped to frame 6. Thus, logical address 4 maps to physical address 24 (= (6 x 4) + 0). This is from Galvin please xpln
afroze asked in Operating System Jul 19, 2021
by afroze
7 points
81 views
0 votes
0 answers 69 views
Virtual memory - Self doubt
I have been studying the virtual memory concept in Operating Systems. I understand that : Each process is given its own virtual address space - which might be very larger than the physical address space - to execute. If the processes cannot accommodate its pages in the ... process is $2^{64}$), but obviously my secondary memory is not $2^{64}$ bytes. What am I missing?
madhes23 asked in Operating System Jul 18, 2021
by madhes23
5 points
69 views
0 votes
0 answers 57 views
Scheduling algorithm in Operating System
How do we categorize a scheduling algorithm as CPU bound or I/O bound?
jayantmukundam asked in Operating System Jul 18, 2021
by jayantmukundam
5 points
57 views
0 votes
0 answers 41 views
OPERTING SYSTEM SELF RELOACTING
WHY SELF Relocating program LESS EFFICIENT THAN RELOCATABLE PROGRAM?
NITESH 766 asked in Operating System Jun 28, 2021
by NITESH 766
5 points
41 views
0 votes
0 answers 19 views
Galvin chapter -11 section 11.7 Recovery
hi this “recovery” topic in chapter 11 is necessary for os in gate or it is compulsory for doing for gate or can we skip this section. thank you
ykrishnay asked in Operating System Jun 24, 2021
by ykrishnay
103 points
19 views
0 votes
0 answers 19 views
I/O Scheduling in Operating system Gate 2021 Update #source #self-doubt
ykrishnay asked in Operating System Jun 24, 2021
by ykrishnay
103 points
19 views
0 votes
0 answers 35 views
self doubght
what is difference between preemption and inturrupts on process state diagram
Sachin85 asked in Operating System Jun 17, 2021
by Sachin85
5 points
35 views
0 votes
0 answers 60 views
Process management
In state transition diagram of scheduling if there is transition from running to ready then it will be preemptive scheduling otherwise not?? My doubt is if process request for io then it will move to blocked state and after completion then it will be pushed to ready state and again can go to running the. It also should be preemptive scheduling na !! Plz clear this doubt.
Vink7389 asked in Operating System Jun 12, 2021
by Vink7389
9 points
60 views
0 votes
0 answers 54 views
This question is related to Intrested Variable Mechnanism in Operating System.
anupam_12 asked in Operating System Jun 10, 2021
by anupam_12
5 points
54 views
0 votes
0 answers 41 views
System calls are onto or one to one?
afroze asked in Operating System May 27, 2021
by afroze
7 points
41 views
0 votes
0 answers 35 views
why cscan and scan is good for heavy load on disk ?Can anybody give proper explanation why this is so.
ignacio asked in Operating System May 27, 2021
by ignacio
5 points
35 views
0 votes
0 answers 51 views
Gate previous year question
User level threads are transparent to the kernel. This statement true or false ? Os don't know about the user leval threads because it is treated as process then why this is true ?
Enolx.21 asked in Operating System Apr 30, 2021
by Enolx.21
53 points
51 views
0 votes
0 answers 60 views
https://www.cs.utexas.edu/~lorenzo/corsi/cs372/06F/hw/3sol.html
Pranavapp asked in Operating System Apr 13, 2021
by Pranavapp
5 points
60 views
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