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

   1 // Copyright (C) 2003-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 #include <unistd.h>
  19 #include <cstdio>
  20 #include <fstream>
  21 #include <testsuite_performance.h>
  22
  23 // libstdc++/9876
  24 int main()
  25 {
  26   using namespace std;
  27   using namespace __gnu_test;
  28
  29   time_counter time;
  30   resource_counter resource;
  31   const int iterations = 100000000;
  32
  33   // C
  34   FILE* file = fopen("tmp", "w+");
  35   start_counters(time, resource);
  36   for (int i = 0; i < iterations; ++i)
  37     putc(i % 100, file);
  38   stop_counters(time, resource);
  39   fclose(file);
  40   report_performance(__FILE__, "C", time, resource);
  41   clear_counters(time, resource);
  42
  43   // C unlocked
  44   file = fopen("tmp", "w+");
  45   start_counters(time, resource);
  46   for (int i = 0; i < iterations; ++i)
  47     putc_unlocked(i % 100, file);
  48   stop_counters(time, resource);
  49   fclose(file);
  50   report_performance(__FILE__, "C unlocked", time, resource);
  51   clear_counters(time, resource);
  52
  53
  54   // C++
  55   filebuf buf;
  56   buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
  57   start_counters(time, resource);
  58   for (int i = 0; i < iterations; ++i)
  59     buf.sputc(i % 100);
  60   stop_counters(time, resource);
  61   report_performance(__FILE__, "C++", time, resource);
  62
  63   unlink("tmp");
  64   return 0;
  65 }