```c#define HELLO printf("hello\n")void doit() { if (fork() == 0) { fork(); HELLO; return; } HELLO; return;}int main() { doit(); HELLO; return 0;}```### Questions:a. Assume no call to `fork()` fails. How many times does the above program print “hello”?b. Does that answer change if `==` is changed to `!=` in the `doit()` function?c. Draw a process graph showing the evolution of this program.### Explanation:The program uses the `fork()` system call to create new processes. The `fork()` call returns zero to the child process and the child's process ID to the parent process. The defined macro `HELLO` is used to print "hello" each time it is invoked. The program is a typical case to study process creation and termination in Unix-like systems. To answer the questions, one must analyze the behavior of `fork()` within the execution flow. 1. **Execution Flow:** - The `main` function calls `doit()`. - In `doit()`, the `fork()` creates a child process. - Depending on the return value, either the child or the parent continues executing. - An additional `fork()` occurs in the child process. - Each valid execution of `HELLO` results in printing "hello".2. **Process Graph:** - Illustrates the parent-child relationship and the sequence of "hello" prints across processes.Understanding the intricacies of process management and output prediction is crucial for mastering system-level programming.

Below are the solutions explained

#define HELLO printf("hello\n") void doit () { } if (fork()==0) { fork(); HELLO; return; } HELLO; return; int main() { doit (); HELLO; return 0; } a. Assume no call to fork () fails. How many times does the above program print "hello"? b. Does that answer change if == is changed to != in the doit () function? c. Draw a process graph showing the evolution of this program.

#define HELLO printf("hello\n") void doit () { } if (fork()==0) { fork(); HELLO; return; } HELLO; return; int main() { doit (); HELLO; return 0; } a. Assume no call to fork () fails. How many times does the above program print "hello"? b. Does that answer change if == is changed to != in the doit () function? c. Draw a process graph showing the evolution of this program.

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

Translator Write a program that deals a number of cards (their numerical values) to a player's hand. To begin, the program asks the player for the values of the deck of cards to realize the program in c language. Then, the program deals the first two cards of the deck to a player's hand, and asks him if he wants another card. If he does not want a card, the program ends. If he wants a card, the program deals the next available card in the deck, adds it to the player's hand, and asks the player if he wants another card. The dealing process repeats as long as the user continues to accept cards, or until the cards in the deck run out. Card dealing involves copying the available card from the deck vector to another vector, which stores the player's hand, at the next available position. Assume that the deck of cards consists of only 10 cards with numerical values from 1 to 10, which the player will enter by keyboard before the program deals. The following functions…
* Find the result for the following program include doublevalue (int z) { z*=2; --z; return z;} int main( ) {int a, b; a=16; b=23; aa=doublevalue(a); bb=doublevalue(b); f=(aa%2) +bb+2; cout<
1
using System; using System.IO; class Program { static void Main() { // Prompt for patient information until the user enters 999 to quit while (true) { Console.Write("Enter patient ID number or 999 to quit >> "); string patientId = Console.ReadLine(); if (patientId == "999") break; Console.Write("Enter last name >> "); string lastName = Console.ReadLine(); Console.Write("Enter balance >> "); decimal balance; while (!decimal.TryParse(Console.ReadLine(), out balance)) { Console.WriteLine("Invalid input. Please enter a valid balance."); } // Create a Patient object and write the data to the file Patient patient = new Patient(patientId, lastName, balance); WritePatientRecord(patient); } Console.WriteLine("Patient records saved to Patients.txt"); } static void WritePatientRecord(Patient patient) { // Open the file in append mode or create it if it doesn't exist using (StreamWriter writer = File.AppendText("Patients.txt")) { // Write the patient data in the specified format…
Find and fix any logic and syntax errors. Program runs and produce the following output. Tips are The tip should be at least 7.5 The tip should be at least 2.99 // This class calculates a waitperson's tip as 15% of the bill// public class DebugThree1 { public static void main(String args[]) { double myCheck = 50.00; double yourCheck = 19.95; System.out.println("Tips are"); calcTip(myCheck); calcTip(yourCheck); } public void calcTip(double bill) { final double RATE = 0.15; double tip; tip = check * RATE; System.out.println("The tip should be at least " + tip); } }
Assignment 16: Iteration Control Structure - Hands on practice Hint: Consider numbers 1 to 10, for each number find the odd multiples. Example, for 1, it should be 1, 3, 5, 7, 9 Objective: Given a real world problem, implement the logic and solve the problem using appropriate constructs (sequen- tial, selection, iteration) using an object oriented program- ming language (Java) for 2, it should be 2, 6, 10, 14, 18 Estimated time: 50 minutes Summary of this assignment: In this assignment, you have learnt the implementation of iteration control structures. Problem Description: Write simple java programs to implement the following prob- lems. 1.Find the sum of first 5 numbers (1 to 5) using for loop End of document statement 2.Find the product of first 5 numbers (1 to 5) using while loop statement 3. Generate the multiplication table of 10 upto multiple value 500 4.Calculate the square of first 5 numbers (1 to 5) using do..while statement 5.Find the odd multiples among the first 10…
Code_Method to check if x is power of 2*/ static boolean isPowerOfTwo (int x) { /* First x in the below expression is for the case when x is 0 */ return x!=0 && ((x&(x-1)) == 0); }
Find out error if any into the followingprogram. #include <iostream.h>main(){int a;cout<<”Enter any No. ? ”;cin>>a;Switch(a>10);{Case 1:cout<<”One”; Break;Case 2:cout<<”Two”;Break;elsecout<<”value is greater than 2”;}}Errors: