#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[]) {

  int i; 
  int tid=-1; 

  omp_set_num_threads(4);

  printf("before parfor tid: %d, tid address: %p\n",tid, (void*) &tid); 
  printf("before parfor i: %i, i address: %p\n",i, (void*) &i); 

  #pragma omp parallel private(tid) 
  {
     /* Obtain thread number */
     tid = omp_get_thread_num();

     #pragma omp critical 
     printf("tid: %d, tid address: %p\n",tid, (void*) &tid); 
  }  /* All threads join master thread and disband */

  printf("after parfor tid: %d, tid address: %p\n",tid, (void*) &tid); 

}

// 

// before parfor tid: -1, tid address: 0x7ffcab5486b8
// before parfor i: 0, i address: 0x7ffcab5486bc
// tid: 0, tid address: 0x7ffcab54868c
// tid: 3, tid address: 0x7ff1587c2e0c
// tid: 2, tid address: 0x7ff1591c3e0c
// tid: 1, tid address: 0x7ff159bc4e0c
// after parfor tid: -1, tid address: 0x7ffcab5486b8