c语言计算函数消耗时间

  struct timeval tv1, tv2;
  double sec = 0;
  gettimeofday(&tv1, 0);

  HEGGTOPCOLLECTOR hTopCollector = eggTopCollector_new(0); // top 10

  gettimeofday(&tv2, 0);
  sec = (double)(tv2.tv_sec - tv1.tv_sec) +  (double)(tv2.tv_usec - tv1.tv_usec) / 1000000;
  printf("time1: %f\n", sec);