libstdc++-v3/testsuite/performance/filebuf_copy.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 int main()
  33 {
  34   using namespace std;
  35   using namespace __gnu_test;
  36
  37   time_counter time;
  38   resource_counter resource;
  39   const unsigned long count = 1ul << 30;
  40
  41   // C unlocked
  42   FILE* fpi = fopen("/dev/zero", "r");
  43   FILE* fpo = fopen("/dev/null", "w");
  44   start_counters(time, resource);
  45   for (unsigned long i = 0; i < count; ++i)
  46     {
  47       int c = getc_unlocked(fpi);
  48       if (c == EOF || putc_unlocked(c, fpo) == EOF)
  49         break;
  50     }
  51   stop_counters(time, resource);
  52   fclose(fpi);
  53   fclose(fpo);
  54   report_performance(__FILE__, "C unlocked", time, resource);
  55   clear_counters(time, resource);
  56
  57   // C++
  58   filebuf in;
  59   in.open("/dev/zero", ios::in);
  60   filebuf out;
  61   out.open("/dev/null", ios::out);
  62   start_counters(time, resource);
  63   for (unsigned long i = 0; i < count; ++i)
  64     {
  65       int c = in.sbumpc();
  66       if (c == EOF || out.sputc(c) == EOF)
  67         break;
  68     }
  69   stop_counters(time, resource);
  70   in.close();
  71   out.close();
  72   report_performance(__FILE__, "C++", time, resource);
  73
  74   return 0;
  75 }