ceph/src/boost/libs/smart_ptr/test/weak_ptr_timing_test.cpp

   1 #include <boost/config.hpp>
   2
   3 #if defined(BOOST_MSVC)
   4 #pragma warning(disable: 4786)  // identifier truncated in debug info
   5 #pragma warning(disable: 4710)  // function not inlined
   6 #pragma warning(disable: 4711)  // function selected for automatic inline expansion
   7 #pragma warning(disable: 4514)  // unreferenced inline removed
   8 #endif
   9
  10 //
  11 //  weak_ptr_timing_test.cpp
  12 //
  13 //  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
  14 //  Copyright 2005 Peter Dimov
  15 //
  16 // Distributed under the Boost Software License, Version 1.0. (See
  17 // accompanying file LICENSE_1_0.txt or copy at
  18 // http://www.boost.org/LICENSE_1_0.txt)
  19 //
  20
  21 #include <boost/shared_ptr.hpp>
  22 #include <boost/weak_ptr.hpp>
  23
  24 #include <vector>
  25 #include <cstdio>
  26 #include <ctime>
  27 #include <cstdlib>
  28
  29 //
  30
  31 int const n = 29000;
  32 int const k = 2048;
  33
  34 void test( std::vector< boost::shared_ptr<int> > & v )
  35 {
  36     using namespace std; // printf, rand
  37
  38     std::vector< boost::weak_ptr<int> > w( v.begin(), v.end() );
  39
  40     int s = 0, r = 0;
  41
  42     for( int i = 0; i < n; ++i )
  43     {
  44         // randomly kill a pointer
  45
  46         v[ rand() % k ].reset();
  47
  48         for( int j = 0; j < k; ++j )
  49         {
  50             if( boost::shared_ptr<int> px = w[ j ].lock() )
  51             {
  52                 ++s;
  53             }
  54             else
  55             {
  56                 ++r;
  57                 w[ j ] = v[ rand() % k ];
  58             }
  59         }
  60     }
  61
  62     printf( "\n%d locks, %d rebinds.", s, r );
  63 }
  64
  65 int main()
  66 {
  67     using namespace std; // printf, clock_t, clock
  68
  69     std::vector< boost::shared_ptr<int> > v( k );
  70
  71     for( int i = 0; i < k; ++i )
  72     {
  73         v[ i ].reset( new int( 0 ) );
  74     }
  75
  76     clock_t t = clock();
  77
  78     test( v );
  79
  80     t = clock() - t;
  81
  82     printf( "\n\n%.3f seconds.\n", static_cast<double>( t ) / CLOCKS_PER_SEC );
  83
  84     return 0;
  85 }