#define _GNU_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <omp.h>
#include <pthread.h>

uint64_t inc(uint64_t i) { return ++i; }

uint64_t _inc(uint64_t i) {
  pthread_t thr; uint64_t ret;
  pthread_create(&thr, NULL, inc, i);
  pthread_join(thr, &ret);
  return ret;
}

void inc_test(uint64_t count) {
  uint64_t i = 0;
  while((i = _inc(i)) != count);
}

void _run(uint64_t threads, uint64_t count) {
  pthread_t thr[threads];
  uint64_t i = 0;
  do {
    pthread_create(&thr[i], NULL, inc_test, count);
  } while(++i != threads);
  i = 0;
  do {
    pthread_join(thr[i], NULL);
  } while(++i != threads);
}

int main(void) {
  uint64_t i = 0, count = 100*1000, threads = 4;
  double start = omp_get_wtime();
  _run(threads, count);
  double time = omp_get_wtime() - start;
  fprintf(stderr, "%lftp/s\n", (count * threads)/time);
  return 0;
}