thread3.cpp

#include <iostream>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

void* thread_summation(void* arg);
int sum = 0;

// struct range
// {
//     /* data */
//     int num1[2] = { 1, 5 };
//     int num2[2] = { 6, 10 };
// }range;


int main()
{
    pthread_t t_id1, t_id2;
    int range1[] = { 1, 5 };
    int range2[] = { 6, 10 };
    int sum1 = 0, sum2 = 0;

    pthread_create(&t_id1, NULL, thread_summation, (void*)range1);
    pthread_create(&t_id2, NULL, thread_summation, (void*)range2);

    pthread_join(t_id1, NULL);
    pthread_join(t_id2, NULL);
    cout << "result: " << sum << endl;
    return 0; 
}

void* thread_summation(void* arg) 
{
    int start = ((int*)arg)[0];
    int end = ((int*)arg)[1];

    while (start <= end) {
        sum += start;
        ++start;
    }
    return NULL;
}