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Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?
- a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)
- b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)
- c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)
- d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)
Correct answer is option 'B'. Can you explain this answer?
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Three concurrent processes X, Y, and Z execute three different code se...
Option A can cause deadlock. Imagine a situation process X has acquired a, process Y has acquired b and process Z has acquired c and d. There is circular wait now. Option C can also cause deadlock. Imagine a situation process X has acquired b, process Y has acquired c and process Z has acquired a. There is circular wait now. Option D can also cause deadlock. Imagine a situation process X has acquired a and b, process Y has acquired c. X and Y circularly waiting for each other.
Consider option A) for example here all 3 processes are concurrent so X will get semaphore a, Y will get b and Z will get c, now X is blocked for b, Y is blocked for c, Z gets d and blocked for a. Thus it will lead to deadlock. Similarly one can figure out that for B) completion order is Z,X then Y.
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Three concurrent processes X, Y, and Z execute three different code se...
Explanation:
The given problem involves three concurrent processes X, Y, and Z that access and update shared variables. Each process executes code segments and performs P (wait) and V (signal) operations on semaphores. The goal is to find a deadlock-free order of invoking the P operations by the processes.
Given information:
- Process X executes P operations on semaphores a, b, and c.
- Process Y executes P operations on semaphores b, c, and d.
- Process Z executes P operations on semaphores c, d, and a.
- All semaphores are binary semaphores initialized to one.
Deadlock:
A deadlock occurs when processes are unable to proceed because each is waiting for resources held by the others. In this case, a deadlock can occur if the processes acquire the semaphores in a circular dependency, causing them to wait indefinitely.
Order of invoking P operations:
To find a deadlock-free order, we need to ensure that no circular dependency exists among the processes when acquiring the semaphores. Let's analyze the given options:
a) X: P(a) P(b) P(c) Y: P(b) P(c) P(d) Z: P(c) P(d) P(a)
b) X: P(b) P(a) P(c) Y: P(b) P(c) P(d) Z: P(a) P(c) P(d)
c) X: P(b) P(a) P(c) Y: P(c) P(b) P(d) Z: P(a) P(c) P(d)
d) X: P(a) P(b) P(c) Y: P(c) P(b) P(d) Z: P(c) P(d) P(a)
Analysis:
We can analyze the options by checking if there is a circular dependency among the processes.
a) X: P(a) P(b) P(c) Y: P(b) P(c) P(d) Z: P(c) P(d) P(a)
- X waits for a, Y waits for b, Z waits for c, and X waits for a (circular dependency). Deadlock can occur.
b) X: P(b) P(a) P(c) Y: P(b) P(c) P(d) Z: P(a) P(c) P(d)
- X waits for b, Y waits for c, Z waits for a, and X waits for b. No circular dependency. Deadlock-free.
c) X: P(b) P(a) P(c) Y: P(c) P(b) P(d) Z: P(a) P(c) P(d)
- X waits for b, Y waits for c, Z waits for a, and X waits for b. No circular dependency. Deadlock-free.
d) X: P(a) P(b) P(c) Y: P(c) P(b) P(d) Z: P(c) P(d) P(a)
- X waits for a, Y waits for b, Z waits for c, and X waits for a (circular dependency). Deadlock can occur.
Conclusion:
Among the given options, option B (X: P(b) P(a) P(c
The given problem involves three concurrent processes X, Y, and Z that access and update shared variables. Each process executes code segments and performs P (wait) and V (signal) operations on semaphores. The goal is to find a deadlock-free order of invoking the P operations by the processes.
Given information:
- Process X executes P operations on semaphores a, b, and c.
- Process Y executes P operations on semaphores b, c, and d.
- Process Z executes P operations on semaphores c, d, and a.
- All semaphores are binary semaphores initialized to one.
Deadlock:
A deadlock occurs when processes are unable to proceed because each is waiting for resources held by the others. In this case, a deadlock can occur if the processes acquire the semaphores in a circular dependency, causing them to wait indefinitely.
Order of invoking P operations:
To find a deadlock-free order, we need to ensure that no circular dependency exists among the processes when acquiring the semaphores. Let's analyze the given options:
a) X: P(a) P(b) P(c) Y: P(b) P(c) P(d) Z: P(c) P(d) P(a)
b) X: P(b) P(a) P(c) Y: P(b) P(c) P(d) Z: P(a) P(c) P(d)
c) X: P(b) P(a) P(c) Y: P(c) P(b) P(d) Z: P(a) P(c) P(d)
d) X: P(a) P(b) P(c) Y: P(c) P(b) P(d) Z: P(c) P(d) P(a)
Analysis:
We can analyze the options by checking if there is a circular dependency among the processes.
a) X: P(a) P(b) P(c) Y: P(b) P(c) P(d) Z: P(c) P(d) P(a)
- X waits for a, Y waits for b, Z waits for c, and X waits for a (circular dependency). Deadlock can occur.
b) X: P(b) P(a) P(c) Y: P(b) P(c) P(d) Z: P(a) P(c) P(d)
- X waits for b, Y waits for c, Z waits for a, and X waits for b. No circular dependency. Deadlock-free.
c) X: P(b) P(a) P(c) Y: P(c) P(b) P(d) Z: P(a) P(c) P(d)
- X waits for b, Y waits for c, Z waits for a, and X waits for b. No circular dependency. Deadlock-free.
d) X: P(a) P(b) P(c) Y: P(c) P(b) P(d) Z: P(c) P(d) P(a)
- X waits for a, Y waits for b, Z waits for c, and X waits for a (circular dependency). Deadlock can occur.
Conclusion:
Among the given options, option B (X: P(b) P(a) P(c
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Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer?
Question Description
Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. 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 Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. 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 Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer?.
Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. 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 Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. 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 Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer?.
Solutions for Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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Here you can find the meaning of Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?a)X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)b)X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)c)X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)d)X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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