#pragma omp parallel for is not following round robin rule

[tianyizhangcs]

omp_set_num_threads(5);

#pragma omp parallel for
for (i = 0; i < 6; i++)
{
printf("Hello World #%d, From thread %d\n ", i, omp_get_thread_num());
result_1[i] = i;
}

hpxmp result:
Hello World #0, From thread 0
Hello World #4, From thread 2
Hello World #5, From thread 2
Hello World #1, From thread 0
Hello World #2, From thread 1
Hello World #3, From thread 1

openmp result:
Hello World #0, From thread 0
Hello World #2, From thread 1
Hello World #3, From thread 2
Hello World #1, From thread 0
Hello World #5, From thread 4
Hello World #4, From thread 3