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

#define NUM_THREADS 100

static pthread_t child_thread[NUM_THREADS];
static unsigned long long counters[NUM_THREADS];
static volatile int done;

static void *
child_function (void *arg)
{
  while (!done)
    counters[(long) arg]++;   // set breakpoint here
  return NULL;
}

int
main (void)
{
  long i;

  for (i = 0; i < NUM_THREADS; i++)
    pthread_create (&child_thread[i], NULL, child_function, (void *) i);

  sleep (10);

  done = 1;

  for (i = 0; i < NUM_THREADS; i++)
    pthread_join (child_thread[i], NULL);

  double avg = 0;
  for (i = 0; i < NUM_THREADS; i++)
    {
      printf ("thread %02ld, count %llu\n", i, counters[i]);
      avg += counters[i];
    }

  double f = avg;
  f /= NUM_THREADS;

  printf ("avg              %f\n", f);

  return 0;
}