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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();
- boost::detail::lw_thread_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 )
- {
- boost::detail::lw_thread_join( a[j] );
- }
- t = clock() - t;
- printf("\n\n%.3f seconds.\n", static_cast<double>(t) / CLOCKS_PER_SEC);
- return 0;
- }
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