Suppose we are dealing with a set of 4 processes P = {P1, P2, P3, P4} that are expressed by the following precedence relation: ⇒: {(P3, P4), (P1, P2), (P2, P4)} Show how you can use semaphores to enforce these constraints (i.e. the precedence relation ⇒). Recall that semaphores have two operations, P() and V() which decrement and increment the semaphore respectively. Also recall that semaphores can put the process to sleep under certain circumstances (which I hope that you remember). Note: This means showing when the P and V operations will be called on each semaphore (for any process which uses them).
Suppose we are dealing with a set of 4 processes P = {P1, P2, P3, P4} that are expressed by the following precedence relation: ⇒: {(P3, P4), (P1, P2), (P2, P4)} Show how you can use semaphores to enforce these constraints (i.e. the precedence relation ⇒). Recall that semaphores have two operations, P() and V() which decrement and increment the semaphore respectively. Also recall that semaphores can put the process to sleep under certain circumstances (which I hope that you remember). Note: This means showing when the P and V operations will be called on each semaphore (for any process which uses them).
C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter17: Linked Lists
Section: Chapter Questions
Problem 2PE
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Transcribed Image Text:Suppose we are dealing with a set of 4 processes P = {P1, P2, P3, P4} that are expressed by the
following precedence relation:
⇒: {(P3, P4), (P1, P2), (P2, P4)}
Show how you can use semaphores to enforce these constraints (i.e. the precedence relation ⇒).
Recall that semaphores have two operations, P() and V() which decrement and increment the
semaphore respectively. Also recall that semaphores can put the process to sleep under certain
circumstances (which I hope that you remember).
Note: This means showing when the P and V operations will be called on each semaphore (for any
process which uses them).
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