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#include <boost/config.hpp>
#if defined(BOOST_MSVC)
#pragma warning(disable: 4786) // identifier truncated in debug info
#pragma warning(disable: 4710) // function not inlined
#pragma warning(disable: 4711) // function selected for automatic inline expansion
#pragma warning(disable: 4514) // unreferenced inline removed
#endif
// weak_ptr_mt_test.cpp
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
// Copyright 2005, 2008 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/bind.hpp>
#include <vector>
#include <cstdio>
#include <ctime>
#include <cstdlib>
#include <boost/detail/lightweight_thread.hpp>
//
int const n = 16384;
int const k = 512; // vector size
int const m = 16; // threads
void test( std::vector< boost::shared_ptr<int> > & v )
{
using namespace std; // printf, rand
std::vector< boost::weak_ptr<int> > w( v.begin(), v.end() );
int s = 0, f = 0, r = 0;
for( int i = 0; i < n; ++i )
{
// randomly kill a pointer
v[ rand() % k ].reset();
++s;
for( int j = 0; j < k; ++j )
{
if( boost::shared_ptr<int> px = w[ j ].lock() )
{
++s;
if( rand() & 4 )
{
continue;
}
// rebind anyway with prob. 50% for add_ref_lock() against weak_release() contention
++f;
}
else
{
++r;
}
w[ j ] = v[ rand() % k ];
}
}
printf( "\n%d locks, %d forced rebinds, %d normal rebinds.", s, f, r );
}
#if defined( BOOST_HAS_PTHREADS )
char const * thmodel = "POSIX";
#else
char const * thmodel = "Windows";
#endif
int main()
{
using namespace std; // printf, clock_t, clock
printf("Using %s threads: %d threads, %d * %d iterations: ", thmodel, m, n, k );
std::vector< boost::shared_ptr<int> > v( k );
for( int i = 0; i < k; ++i )
{
v[ i ].reset( new int( 0 ) );
}
clock_t t = clock();
pthread_t a[ m ];
for( int i = 0; i < m; ++i )
{
boost::detail::lw_thread_create( a[ i ], boost::bind( test, v ) );
}
v.resize( 0 ); // kill original copies
for( int j = 0; j < m; ++j )
{
pthread_join( a[j], 0 );
}
t = clock() - t;
printf("\n\n%.3f seconds.\n", static_cast<double>(t) / CLOCKS_PER_SEC);
return 0;
}
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