Reduction 간단 예제

#include <stdio.h>

int main(int argc, char** argv)
{
    int num;
    if(argc < 2)
        return 0;
    num = atoi(argv[1]);
    int x = 1;

#pragma omp parallel num_threads(num) reduction(* : x)
    {
        x = omp_get_thread_num() + 1;    
    }

    printf("%d\n", x);
    return 0;
}