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Recent questions tagged binary-semaphore

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GATE CSE 2023 | Memory Based Question: 19
incr() { wait(s) x = x+1 signal(s) } decr() { wait(s) x = x-1 signal(s) } Shared integer variable $\mathrm{x}$ initialized with $10.$ There are five threads which are calling incr() and there are three threads which are calling decr() ... $s=2$ minimum possible value of $\mathrm{x}$ is $\mathrm{V}_2$ $15,8$ $12,8$ $15,7$ $12,7$

GO Classes asked in Operating System Feb 5, 2023

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2 votes

1 answer

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Binary Semaphore
Say there is a Binary semaphore R, initialized to 0. Say process X and Y are working on R. At T1 :- X has performed P(R); X gets blocked and gets added in Process Queue. At T2 :-Y has performed V(R); Will Process X get unblocked and removed from ready queue? Which process will run after Y has performed V(R)? Process Y or Process X?

subhashchaganti asked in Operating System Sep 21, 2022

by subhashchaganti

508 views

1 vote

3 answers

3

Applied Gate Full Length Test
Let S be the binary semaphore variable initialized to zero. If no blocked processes exist in the system then consider the execution of the following signal (V), wait (P) operation. The number of blocked processes at the end are _________. 4 P, 6 V, 9 P, 13 V, 14 P

Sagar475 asked in Operating System Jan 18, 2022

467 views

2 votes

1 answer

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NPTEL Assignment Question
Suppose we want to synchronize two concurrent processes P and Q

rsansiya111 asked in Operating System Dec 8, 2021

516 views

3 votes

1 answer

5

Applied Test Series
Let S be a binary semaphore variable. Let S = 0 initially. Assume that no blocked processes exist in the system. The following signal (V), wait (P) operations are performed. 5 P, 7 V, 10 P, 13 V, 17 P The number of blocked processes at the end are _________.

LRU asked in Operating System Oct 17, 2021

by LRU

576 views

3 votes

4 answers

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Ace Test Series: Operating System - Reader Writer Problem

Na462 asked in Operating System Jan 21, 2019

by Na462

1.9k views

1 vote

1 answer

7

semaphore
a) s1-wait(p) , s2-wait(q) , s3-wait(q) , s4-wait(p) b) s1-wait(p) , s2-wait(q) , s3-wait(p) , s4-wait(q) c) s1-wait(q) , s2-wait(p) , s3-wait(p) , s4-wait(q) d) none of above

Rahul_Rathod_ asked in Operating System Dec 12, 2018

by Rahul_Rathod_

1.5k views

2 votes

1 answer

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Simple Doubt in counting semaphore
Consider a non-negative counting semaphore S. During an execution, 16P (wait) operations, and 4V (signal) operations are issued in some order. The largest initial value of S for which at least three up operations will remain blocked is ___________ Can someone explain me the solution

Pavan Shetty asked in Operating System Nov 22, 2018

by Pavan Shetty

892 views

0 votes

1 answer

9

self doubt
What is the actual difference between binary semaphore & Mutex????? Are both same thing???? What is the up() code for binary semaphore?????

mrinmoyh asked in Operating System Nov 15, 2018

656 views

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0 answers

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MADE EASY TEST SERIES
HOW ARE THE CURRENT OPERATORS CREATING DEADLOCK HERE?

Avik Chowdhury asked in Operating System Sep 27, 2018

by Avik Chowdhury

319 views

0 votes

0 answers

11

Binary-semaphones
The number of binary semaphores required to implement readers-writers code in busy waiting mode is ------------- answer given as 1. why 1 and why not 2?

balaganesh asked in Operating System Sep 21, 2018

463 views

0 votes

2 answers

12

Self Doubt (Semaphores)
struct Semaphore { enum value(0,1); Queue type L; } Down (Semaphore S) { if(S.value==1) { S.value=0; } else { put process(PCB) in S.L; sleep(); } } Up(Semaphore S) { if(S.L is empty) { S.value=1; } else { select a process from S.L; ... and goes to sleep. P0 comes out and exeutes the else part of Up and wakes P1 up. Now how will P1 enter the CS, since S.value is still 0?

Samujjal Das asked in Operating System Feb 5, 2017

by Samujjal Das

4.0k views

3 votes

2 answers

13

Self Doubt
Q : Each process Pi , i = 1 to 9 executes the following code : while (TRUE) { P(mutex); Critical section ; V(mutex); } The process P10 executes the following code : while(TRUE) { V(mutex); critical section ; P(mutex); } Initial value of binary semaphore "mutex" = ... at any instant of time? a) 2 b) 3 c) 9 d) 10 e) 1 Plz explain in details which one is true out of these options.

Habibkhan asked in Operating System Oct 16, 2016

2.9k views

1 vote

2 answers

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UGC NET CSE | June 2010 | Part 2 | Question: 39
In order to allow only one process to enter its critical section, binary semaphore are initialized to $0$ $1$ $2$ $3$

makhdoom ghaya asked in Operating System Sep 16, 2016

by makhdoom ghaya

3.2k views

1 vote

1 answer

15

To allow only one process in the critical section, value of a binary semaphore is initialized to __?

Vikrant Singh asked in Operating System Feb 1, 2015

by Vikrant Singh

794 views

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