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Initially s = 1 and t 2. The following operations occur: P executes DOWN(s) Q executes DOWN(t) Q executes DOWN(s) R executes DOWN(t) R executes DOWN(s) P executes UP(s) P executes DOWN(t) Which of the following is a possible state of the system after these operations? (a) All three processes are blocked. (C) P and 0 are blocked: R is not blocked. (b) Pis blocked; Q and R are not blocked. (d) P and Q are not blocked; R is blocked.

Initially s = 1 and t 2. The following operations occur: P executes DOWN(s) Q executes DOWN(t) Q executes DOWN(s) R executes DOWN(t) R executes DOWN(s) P executes UP(s) P executes DOWN(t) Which of the following is a possible state of the system after these operations? (a) All three processes are blocked. (C) P and 0 are blocked: R is not blocked. (b) Pis blocked; Q and R are not blocked. (d) P and Q are not blocked; R is blocked.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Suppose that there are three processes P, Q, and R, and two semaphores s and t. Initially s = 1 and t = 2. The following operations occur: P executes DOWN(s) Q executes DOWN(t) Q executes DOWN(s) R executes DOWN(t) R executes DOWN(s) P executes UP(s) P executes DOWN(t) %3D Which of the following is a possible state of the system after these operations? (a) All three processes are blocked. (c) P and Q are blocked; R is not blocked. (b) Pis blocked; Q and R are not blocked. (d) P and Q are not blocked; R is blocked.
Transcribed Image Text:Suppose that there are three processes P, Q, and R, and two semaphores s and t. Initially s = 1 and t = 2. The following operations occur: P executes DOWN(s) Q executes DOWN(t) Q executes DOWN(s) R executes DOWN(t) R executes DOWN(s) P executes UP(s) P executes DOWN(t) %3D Which of the following is a possible state of the system after these operations? (a) All three processes are blocked. (c) P and Q are blocked; R is not blocked. (b) Pis blocked; Q and R are not blocked. (d) P and Q are not blocked; R is blocked.
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