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89 lines
1.6 KiB
C++
Executable File
89 lines
1.6 KiB
C++
Executable File
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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <iostream>
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#include <cstdlib>
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#include <stdexcept>
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#include <vector>
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#include <boost/assert.hpp>
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#include <boost/bind.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include "boost/task.hpp"
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namespace pt = boost::posix_time;
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namespace tsk = boost::tasks;
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typedef tsk::static_pool< tsk::unbounded_fifo > pool_type;
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int serial_fib( int n)
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{
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if( n < 2)
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return n;
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else
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return serial_fib( n - 1) + serial_fib( n - 2);
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}
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int parallel_fib( int n, int cutof)
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{
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if ( n < cutof)
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{
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return serial_fib( n);
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}
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else
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{
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BOOST_ASSERT( boost::this_task::runs_in_pool() );
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tsk::handle< int > h1(
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tsk::async(
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tsk::make_task(
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parallel_fib,
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n - 1,
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cutof),
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tsk::as_sub_task() ) );
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tsk::handle< int > h2(
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tsk::async(
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tsk::make_task(
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parallel_fib,
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n - 2,
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cutof),
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tsk::as_sub_task() ) );
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return h1.get() + h2.get();
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}
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}
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int main( int argc, char *argv[])
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{
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try
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{
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pool_type pool( tsk::poolsize( 5) );
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int n = 10;
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tsk::handle< int > h(
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tsk::async(
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tsk::make_task(
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parallel_fib,
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n,
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5),
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pool) );
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std::cout << "fibonacci(" << n << ") == " << h.get() << std::endl;
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return EXIT_SUCCESS;
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}
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catch ( std::exception const& e)
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{ std::cerr << "exception: " << e.what() << std::endl; }
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catch ( ... )
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{ std::cerr << "unhandled" << std::endl; }
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return EXIT_FAILURE;
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}
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