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).

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

See similar textbooks

Similar questions

Generate a BLP lattice–structured system where the objects and subjects are appropriately levelledto give access consistent with the access control matrix below. You need to describe the process bywhich you obtain your lattice. R and W correspond, respectively, to read and append. You are touse only the mandatory BLP rules, and a default allow in place of the discretionary rule. Be sure toadd a level as necssary to ensure this is a lattice.
Implement in C programming language: Question 2 Write a c program that will generate the safe sequence of process execution for the situation given below:(Use Banker’s Algorithm). Note: The code can be implemented in several different ways, but make sure the parameter remains the same as shown below. n = 6; // Number of processes m = 4; // Number of resources int alloc[6][4] = { { 0, 1, 0, 3 }, // P0 // Allocation Matrix { 2, 0, 0, 3 }, // P1 { 3, 0, 2, 0 }, // P2 { 2, 1, 1, 5 }, // P3 { 0, 0, 2, 2 }, // P4 {1, 2 , 3, 1 } }; //P5 int max[6][4] = { { 6, 4, 3, 4 }, // P0 // MAX Matrix { 3, 2, 2, 4 }, // P1 { 9, 1, 2, 6 }, // P2 { 2, 2, 2, 8 }, // P3 { 4, 3, 3, 7 }, // P4 { 6, 2 , 6, 5 } }; //P5 int avail[4] = { 2, 2, 2, 1 };…
For the given design, Which of the following is NOT true about the design? Select one: a. It supports modular design. b. The AuthenticateUser sequence diagram can be reused only after a doB message call. c. The AuthenticateUser sequence diagram can be reused only when the authenticate() message is invoked on a B object. d. The DoFoo sequence diagram can be reused in any context where a B object and a C object are involved. e. The doB message must be called after the doA message.
Using the functional dependencies of Exercise 7.6, compute the canonicalcover Fc.
Need help on this.
In this project you are to design a process queue that is responsible for handling the process requests coming from different users. You have to take into consideration that users have different levels of privileges and priorities. Each user has an identification number and a password, in addition to process priorities. One good idea is to design the queue using an array or pointers while preserving the first-in first-out concept of the queue. For every process request received, the program should check the privileges of that request and whether it can be moved forward in the queue to be served by the operating system prior to serving the other requests. Using the programming language of your choice (preferably C+), write the process queue that would handle the user request. The program must allow for requests coming from different users or from one user.
We wish to implement a system that allows the management of Employees and Students. As a first step. you need to implement the above UML diagrams Notes: . ZOOM . PERSON, EMPLOYEE and STUDENT should be public static constants The no-arg constructor will initialize ID, firstName and lastName to their respective null values. It will set personType to PERSON, and sortorder to LAST_NAME The overloaded constructor will assign each parameter to its respective field. sortorder will also be set to LAST_NAME toString() will output type, ID, firstName and lastName, all tab separated. This is an override method equals() will compare if the current object and the parameter contain the same values. This is an override method compareTo() compares the current object and the parameter. This is an override method. It will be used to sort objects Needs the Comparable interface O Will only compare fields depending on the sortorder. For example, if the sortorder is TYPE, it should then compare the…
Show that a counting semaphore can be implemented using binary semaphores. (Hint: Use a shared variable of type integer and two binary semaphores)
Has to be in C language.
A priority queue is an abstract data type in which each data has a priority associated with it. If the data shares same priority, then whichever comes first in queue is served first. Write a C program for implementing a priority queue (in the increasing order of their value) using transform and conquer technique and implement the same using C language. Modify the program such that we can remove any given data at any given point of time
implemented a system for maintaining rental contracts for a small parking lot. With our knowledge of ordered structures, we now return to that example to incorporate a new feature—an alphabetical listing of contracts. As customers rent spaces from the parking office, contracts are added to a generic list of associations between renter names and lot assignments. We now change that structure to reflect a better means of keeping track of this information—an ordered list of comparable associations.
2