For 4.31 (a) Do not use the passing the baton technique. Solve the problem directly using semaphores. Your answer to Question (a) should be similar to the solution to the Reader/writer's Problem. For Exercise 4.31 (b), you must define the following shared variables/semaphores and use the technique of passing the baton: int nN = 0; // number of northbound cars on the bridge int nS = 0; // number of southbound cars on the bridge sem e = 1; // controls entry to critical section n = 0; // used to delay northbound cars s = 0; // used to delay southbound cars int dn = 0; // number of delayed northbound cars ds = 0; // number of delayed southbound cars 4.31 The One-Lane Bridge. Cars coming from the north and the south arrive at a one-lane bridge. Cars heading in the same direction can cross the bridge at the sametime, but cars heading in opposite directions cannot.(a) Develop a solution to this problem. First specify a global invariant, thendevelop a solution using semaphores for synchronization. Do not worry aboutfairness.(b) Modify your answer to (b) to ensure that any car that is waiting to cross thebridge eventually gets to do so. You may want to solve the problem differently.(Hint: Use the technique of passing the baton.)

Given condition for question (a) Do not use the passing the baton technique. Solve the problem…

Answered: 4.31 The One-Lane Bridge. Cars coming…

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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For 4.31 (a) Do not use the passing the baton technique. Solve the problem directly using semaphores. Your answer to Question (a) should be similar to the solution to the Reader/writer's Problem.
For Exercise 4.31 (b), you must define the following shared variables/semaphores and use the technique of passing the baton:

int nN = 0; // number of northbound cars on the bridge

int nS = 0; // number of southbound cars on the bridge

sem e = 1; // controls entry to critical section

n = 0; // used to delay northbound cars

s = 0; // used to delay southbound cars

int dn = 0; // number of delayed northbound cars

ds = 0; // number of delayed southbound cars

4.31 The One-Lane Bridge. Cars coming from the north and the south arrive at a one-
lane bridge. Cars heading in the same direction can cross the bridge at the same
time, but cars heading in opposite directions cannot.
(a) Develop a solution to this problem. First specify a global invariant, then
develop a solution using semaphores for synchronization. Do not worry about
fairness.
(b) Modify your answer to (b) to ensure that any car that is waiting to cross the
bridge eventually gets to do so. You may want to solve the problem differently.
(Hint: Use the technique of passing the baton.)

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