Complete the following program which creates 5 copies of a thread with different

Question

Complete the following program which creates 5 copies of a thread with different parameters. Specifically, the thread gets a character (ch), an integer number (n), and a double value (d) as parameters. Then the thread simply outputs the given character, integer number, and double value on the screen. /* suppose all necessary libraries are included here *//* Declare structure that you may need */ void *mythread(void *args) {// void main(int argc, char *argv[]) {////Suppose the parameters that will be passed to 5 copies of //threads are stored in the local arrays declared below. //CH[0], N[0], D[0] will be passed to thread 0, and so on. char CH[5] = "ABCDE": int N[5] = {3, 5, 8, 12, 21): double D[5] = {2.5, 3.6, 4.7, 5.8, 6.9): pthread_t tid[5]: for(i = 0: i

Explanation / Answer

#include<iostream>

#include <stdio.h>

#include <stdlib.h>

#include <pthread.h>

using namespace std ;

#define NUM_THREADS 5

struct thread_data{

int thread_id;

char ch[6] = "ABCDE";

int N[5] = {3,5,8,12,21};

double D[5] = {2.5, 3.6, 4.7, 5.8, 6.9};

};

void *PrintHello(void *threadarg) {

struct thread_data *my_data;

my_data = (struct thread_data *) threadarg;

cout << "Thread ID : " << my_data->thread_id ;

cout << " data " << my_data->ch[my_data->thread_id] << " "<<my_data->N[my_data->thread_id] << " "<<my_data->D[my_data->thread_id];

}

main()

{

pthread_t thread1, thread2;

pthread_t threads[NUM_THREADS];

struct thread_data td[NUM_THREADS];

pthread_attr_t attr;

pthread_attr_init(&attr);

pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

void *status;

int rc;

for( int i=0; i < NUM_THREADS; i++ ){

cout <<"creating thread, " << i << endl;

td[i].thread_id = i;

//td[i].message = "This is message";

rc = pthread_create(&threads[i], &attr, PrintHello, (void *)&td[i]);

if (rc){

cout << "Error:unable to create thread," << rc << endl;

exit(-1);

}

}

  

pthread_attr_destroy(&attr);

for( int i=0; i < NUM_THREADS; i++ ){

pthread_join(threads[i], &status);

}

pthread_exit(NULL);

}

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