Given 3 concurrent processes P1, P2 and P3, we suppose that initially the shared variable x = 4. a) List all the possible values for x. b) Use one or more semaphores (use primitives signal and wait) in order to get x=13.1 c) Can we use only one semaphore to get x=11? Explain your answer. P1 P2 x=x-2; P3 ... x=x*3;

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
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Q1
Given 3 concurrent processes P1, P2 and P3, we suppose that initially the shared variable x =4.
a) List all the possible values for x.
b) Use one or more semaphores (use primitives signal and wait) in order to get x=13.1
c) Can we use only one semaphore to get x=11? Explain your answer.
P1
;
...
P2
x=x-2;
P3
x=x*3;
...
Transcribed Image Text:Q1 Given 3 concurrent processes P1, P2 and P3, we suppose that initially the shared variable x =4. a) List all the possible values for x. b) Use one or more semaphores (use primitives signal and wait) in order to get x=13.1 c) Can we use only one semaphore to get x=11? Explain your answer. P1 ; ... P2 x=x-2; P3 x=x*3; ...
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