Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Yandndash;X is _________.Correct answer is '80'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider the concurrent processes P1, P2 and ...

Join the Discussion on the App

Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.

The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.

Correct answer is '80'. Can you explain this answer?

FREE This question is part of

Test : CSE Past Year Paper 2019

Attempt Test

Attempt this Test

Verified Answer

Consider the concurrent processes P1, P2 and P3 as shown below, which ...

For maximum value:
First P₂ & P₁ read the D value as 100.
So, P₂ update it first
⇒ D = D - 50 = 100 - 50 = 50
After P₂, P₁ overwrite the value 50 by 120
⇒ D = D + 20 =100 + 20 =120
Then P₃ read the value of D as 120 and adds 10 to it
⇒ D = 120 + 10 = 130
∴ The max value of D after all 3 processes are executed is 130(Y).
For minimum Value:
All processes read the D value as 100.
But, ensure that last update is from P₂.
So that, the min value of D after all 3 processes are executed is 50 (X).
∴ Difference between X and Y is ( Y - X) = 130 - 50 = 80

View all questions of this test

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for Computer Science Engineering (CSE) exam

Similar Computer Science Engineering (CSE) Doubts

Consider three concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialized to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y - X is __________. Correct answer is '80'. Can you explain this answer?

View answer

We wish to schedule three processes P1, P2 and P3 on a uniprocessor system. The priorities, CPU time requirements and arrival times of the processes are as shown below.We have a choice of preemptive or non-preemptive scheduling. In preemptive scheduling, a late-arriving higher priority process can preempt a currently running process with lower priority. In non-preemptive scheduling, a late-arriving higher priority process must wait for the currently executing process to complete before it can be scheduled on the processor. What are the turnaround times (time from arrival till completion) of P2 using preemptive and non-preemptive scheduling respectively.

View answer

A shared variable x, initialized to zero, is operated on by four concurrent processes W, X, Y, Z as follows. Each of the processes W and X reads x from memory, increments by one, stores it to memory, and then terminates. Each of the processes Y and Z reads x from memory, decrements by two, stores it to memory, and then terminates. Each process before reading x invokes the P operation (i.e., wait) on a counting semaphore S and invokes the V operation (i.e., signal) on the semaphore S after storing x to memory. Semaphore S is initialized to two. What is the maximum possible value of x after all processes complete execution?

View answer

A shared variable x, initialized to zero, is operated on by four concurrent processes W, X, Y, Z as follows. Each of the processes W and X reads x from memory, increments by one, stores it to memory, and then terminates. Each of the processes Y and Z reads x from memory, decrements by two, stores it to memory, and then terminates. Each process before reading x invokes the P operation (i.e., wait) on a counting semaphore S and invokes the V operation (i.e., signal) on the semaphore S after storing x to memory. Semaphore S is initialized to two. What is the maximum possible value of x after all processes complete execution? (GATE CS 2013)

View answer

A shared variable x, initialized to zero, is operated on by four concurrent processes W, X, Y, Z as follows. Each of the processes W and X reads x from memory, increments by one, stores it to memory, and then terminates. Each of the processes Y and Z reads x from memory, decrements by two, stores it to memory, and then terminates. Each process before reading x invokes the P operation (i.e., wait) on a counting semaphore S and invokes the V operation (i.e., signal) on the semaphore S after storing x to memory. Semaphore S is initialized to two. What is the maximum possible value of x after all processes complete execution?

View answer

Top Courses for Computer Science Engineering (CSE)View all

GATE Computer Science Engineering(CSE) 2025 Mock Test Series

Question Bank for GATE Computer Science Engineering

General Aptitude for GATE

Computer Networks

Programming and Data Structures

Top Courses for Computer Science Engineering (CSE)

View all

Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer?

Share with a Friend

Answer this doubt

Question Description
Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer?.

Solutions for Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE). Download more important topics, notes, lectures and mock test series for Computer Science Engineering (CSE) Exam by signing up for free.

Here you can find the meaning of Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer?, a detailed solution for Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? has been provided alongside types of Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Consider the concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialization to 100.The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is _________.Correct answer is '80'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.

Explore Courses for Computer Science Engineering (CSE) exam