#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>

#define LOOPCOUNT 100000

void *NullChild(void *) { }

int main(int argc, char **argv) {
  int forkcount = 0;
  struct timeval before, after;

  gettimeofday(&before, NULL);  // once to warm up call path
  gettimeofday(&before, NULL);  // once for real-sies
  while(1) {
    pthread_t thr;

    pthread_create(&thr, NULL, &NullChild, NULL);
    pthread_join(thr, NULL);
    forkcount++;
    if (forkcount == LOOPCOUNT)
      break;
  }
  gettimeofday(&after, NULL);

  float diff_us = (after.tv_sec - before.tv_sec) * 1000000.0;
  diff_us += (after.tv_usec - before.tv_usec);
  diff_us /= LOOPCOUNT;

  printf("microseconds per thread create: %f\n", diff_us);
  return EXIT_SUCCESS;
}