libstdc++-v3/testsuite/performance/27_io/filebuf_sputc.cc

// Copyright (C) 2003-2023 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

#include <unistd.h>
#include <cstdio>
#include <fstream>
#include <testsuite_performance.h>

// libstdc++/9876
int main() 
{
  using namespace std;
  using namespace __gnu_test;

  time_counter time;
  resource_counter resource;
  const int iterations = 100000000;

  // C
  FILE* file = fopen("tmp", "w+");
  start_counters(time, resource);
  for (int i = 0; i < iterations; ++i)
    putc(i % 100, file);
  stop_counters(time, resource);
  fclose(file);
  report_performance(__FILE__, "C", time, resource);
  clear_counters(time, resource);

  // C unlocked
  file = fopen("tmp", "w+");
  start_counters(time, resource);
  for (int i = 0; i < iterations; ++i)
    putc_unlocked(i % 100, file);
  stop_counters(time, resource);
  fclose(file);
  report_performance(__FILE__, "C unlocked", time, resource);
  clear_counters(time, resource);


  // C++
  filebuf buf;
  buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
  start_counters(time, resource);
  for (int i = 0; i < iterations; ++i)
    buf.sputc(i % 100);
  stop_counters(time, resource);
  report_performance(__FILE__, "C++", time, resource);

  unlink("tmp");
  return 0;
}