Given a system of 4 processes with a set of constraints described by the following precedence relation: →:{(P1, P3), (P2, P4), (P3, P4)) Provide pseudocode for each of those 4 processes to show how you can use semaphores to enforce these constraints. Also, you must initialize these semaphores correctly. Note: There are no cyclic dependencies between the processes.

Given a system of 4 processes with a set of constraints described by the following precedence relation: →:{(P1, P3), (P2, P4), (P3, P4)) Provide pseudocode for each of those 4 processes to show how you can use semaphores to enforce these constraints. Also, you must initialize these semaphores correctly. Note: There are no cyclic dependencies between the processes.

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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Part(a): What is a Deadlock? How it is detected? What are the necessary conditions for a deadlock to occur? Part(b): Suppose there are two resources available and the initial value of semaphore is set to 3.Consider a situation where P() and V() functions are called as follows. P(), P(), V(), V(), P(), P(), V(), P(), P(), V(), P(),P(),P(),V() Answer the following: 1. How many processes are sleeping on P ()?What is the value of semaphore? 2. How may processes have successfully completed their execution? 3. How many resources are available?