Linear Temporal Logic Suppose we have two users: A and B, and a single resource: console. Every now and then, both users would want to use the console. Since there is only once console, only one user can use it at a time. Suppose that we have the following atomic propositions for user A: • A.request indicates that User A requests usage of the console, • A.use indicates that User A is using the console, A.release indicates that User A releases the console. For User B, we also have similar propositions. Specify the following properties in LTL a. Mutual exclusion, i.e., only one user at a time can use the console. b. Finite time of usage, i.e., a user can use the console only for a finite amount of time. c. Absence of individual starvation, i.e., if a user wants to use the console, they eventually can. d. Absence of blocking, i.e., a user can always request to use the console. e. Alternating access, i.e., users must strictly alternate in using the console.

Linear Temporal Logic Suppose we have two users: A and B, and a single resource: console. Every now and then, both users would want to use the console. Since there is only once console, only one user can use it at a time. Suppose that we have the following atomic propositions for user A: • A.request indicates that User A requests usage of the console, • A.use indicates that User A is using the console, A.release indicates that User A releases the console. For User B, we also have similar propositions. Specify the following properties in LTL a. Mutual exclusion, i.e., only one user at a time can use the console. b. Finite time of usage, i.e., a user can use the console only for a finite amount of time. c. Absence of individual starvation, i.e., if a user wants to use the console, they eventually can. d. Absence of blocking, i.e., a user can always request to use the console. e. Alternating access, i.e., users must strictly alternate in using the console.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Linear Temporal Logic
Suppose we have two users: A and B, and a single resource: console. Every now and then, both
users would want to use the console. Since there is only once console, only one user can use it at
a time. Suppose that we have the following atomic propositions for user A:
A.request indicates that User A requests usage of the console,
A.use indicates that User A is using the console,
A.release indicates that User A releases the console.
For User B, we also have similar propositions.
Specify the following properties in LTL
a. Mutual exclusion, i.e., only one user at a time can use the console.
b. Finite time of usage, i.e., a user can use the console only for a finite amount of time.
c. Absence of individual starvation, i.e., if a user wants to use the console, they eventually can.
d. Absence of blocking, i.e., a user can always request to use the console.
e. Alternating access, i.e., users must strictly alternate in using the console.

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