Check mmapped arena

test.cpp

#include <cstdio>
#include <cstdlib>
#include <omp.h>
const int N = 128;
int main(void) {
  char *buf[N];
  #pragma omp parallel for
  for (int i = 0; i < N; i++) {
    buf[i] = (char *)malloc(128);
  }
  bool mmapped_arena_is_used = false;
  for (int i = 0; i < N; i++) {
    size_t *p = (size_t *)buf[i];
    if (*(p - 1) & 4) {
      mmapped_arena_is_used = true;
      break;
    }
  }
  if(mmapped_arena_is_used){
    printf("mmapped arena is used.\n");
  }else{
    printf("mmapped arena is not used.\n");
  }
}