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

   1 // Copyright (C) 2003-2024 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
  19 #include <cstdio>
  20 #include <fstream>
  21 #include <testsuite_performance.h>
  22
  23 int main()
  24 {
  25   using namespace std;
  26   using namespace __gnu_test;
  27
  28   time_counter time;
  29   resource_counter resource;
  30   const unsigned long count = 1ul << 30;
  31
  32   // C unlocked
  33   FILE* fpi = fopen("/dev/zero", "r");
  34   FILE* fpo = fopen("/dev/null", "w");
  35   start_counters(time, resource);
  36   for (unsigned long i = 0; i < count; ++i)
  37     {
  38       int c = getc_unlocked(fpi);
  39       if (c == EOF || putc_unlocked(c, fpo) == EOF)
  40         break;
  41     }
  42   stop_counters(time, resource);
  43   fclose(fpi);
  44   fclose(fpo);
  45   report_performance(__FILE__, "C unlocked", time, resource);
  46   clear_counters(time, resource);
  47
  48   // C++
  49   filebuf in;
  50   in.open("/dev/zero", ios::in);
  51   filebuf out;
  52   out.open("/dev/null", ios::out);
  53   start_counters(time, resource);
  54   for (unsigned long i = 0; i < count; ++i)
  55     {
  56       int c = in.sbumpc();
  57       if (c == EOF || out.sputc(c) == EOF)
  58         break;
  59     }
  60   stop_counters(time, resource);
  61   in.close();
  62   out.close();
  63   report_performance(__FILE__, "C++", time, resource);
  64
  65   return 0;
  66 }