shared_ptr_mt_test.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 83 行

#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

//  shared_ptr_mt_test.cpp - tests shared_ptr with multiple threads
//
//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
//  Copyright (c) 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/bind.hpp>

#include <vector>

#include <cstdio>
#include <ctime>

#include <boost/detail/lightweight_thread.hpp>

//

int const n = 1024 * 1024;

void test( boost::shared_ptr<int> const & pi )
{
    std::vector< boost::shared_ptr<int> > v;

    for( int i = 0; i < n; ++i )
    {
        v.push_back( pi );
    }
}

int const m = 16; // threads

#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 iterations: ", thmodel, m, n );

    boost::shared_ptr<int> pi( new int(42) );

    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, pi ) );
    }

    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;
}