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

   1 // Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 #include <cstdio>
  29 #include <fstream>
  30 #include <testsuite_performance.h>
  31
  32 // libstdc++/9876
  33 int main()
  34 {
  35   using namespace std;
  36   using namespace __gnu_test;
  37
  38   time_counter time;
  39   resource_counter resource;
  40   const int iterations = 100000000;
  41
  42   // C
  43   FILE* file = fopen("tmp", "w+");
  44   start_counters(time, resource);
  45   for (int i = 0; i < iterations; ++i)
  46     putc(i % 100, file);
  47   stop_counters(time, resource);
  48   fclose(file);
  49   report_performance(__FILE__, "C", time, resource);
  50   clear_counters(time, resource);
  51
  52   // C unlocked
  53   file = fopen("tmp", "w+");
  54   start_counters(time, resource);
  55   for (int i = 0; i < iterations; ++i)
  56     putc_unlocked(i % 100, file);
  57   stop_counters(time, resource);
  58   fclose(file);
  59   report_performance(__FILE__, "C unlocked", time, resource);
  60   clear_counters(time, resource);
  61
  62
  63   // C++
  64   filebuf buf;
  65   buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
  66   start_counters(time, resource);
  67   for (int i = 0; i < iterations; ++i)
  68     buf.sputc(i % 100);
  69   stop_counters(time, resource);
  70   report_performance(__FILE__, "C++", time, resource);
  71
  72   unlink("tmp");
  73   return 0;
  74 }