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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\mpi\collectives\broadcast.hpp
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// Copyright (C) 2005, 2006 Douglas Gregor
. // Use, modification and distribution is subject to 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) // Message Passing Interface 1.1 -- Section 4.4. Broadcast #ifndef BOOST_MPI_BROADCAST_HPP #define BOOST_MPI_BROADCAST_HPP #include
#include
#include
#include
namespace boost { namespace mpi { /************************************************************************ * Specializations * ************************************************************************/ /** * INTERNAL ONLY */ template<> BOOST_MPI_DECL void broadcast
(const communicator& comm, const packed_oarchive& oa, int root); /** * INTERNAL ONLY */ template<> BOOST_MPI_DECL void broadcast
(const communicator& comm, packed_oarchive& oa, int root); /** * INTERNAL ONLY */ template<> BOOST_MPI_DECL void broadcast
(const communicator& comm, packed_iarchive& ia, int root); /** * INTERNAL ONLY */ template<> BOOST_MPI_DECL void broadcast
(const communicator& comm, const packed_skeleton_oarchive& oa, int root); /** * INTERNAL ONLY */ template<> void broadcast
(const communicator& comm, packed_skeleton_oarchive& oa, int root); /** * INTERNAL ONLY */ template<> void broadcast
(const communicator& comm, packed_skeleton_iarchive& ia, int root); /** * INTERNAL ONLY */ template<> void broadcast
(const communicator& comm, content& c, int root); /** * INTERNAL ONLY */ template<> void broadcast
(const communicator& comm, const content& c, int root); /************************************************************************ * broadcast() implementation * ************************************************************************/ namespace detail { // We're sending a type that has an associated MPI datatype, so // we'll use MPI_Bcast to do all of the work. template
void broadcast_impl(const communicator& comm, T* values, int n, int root, mpl::true_) { BOOST_MPI_CHECK_RESULT(MPI_Bcast, (values, n, boost::mpi::get_mpi_datatype
(*values), root, MPI_Comm(comm))); } // We're sending a type that does not have an associated MPI // datatype, so we'll need to serialize it. Unfortunately, this // means that we cannot use MPI_Bcast, so we'll just send from the // root to everyone else. template
void broadcast_impl(const communicator& comm, T* values, int n, int root, mpl::false_) { if (comm.rank() == root) { packed_oarchive oa(comm); for (int i = 0; i < n; ++i) oa << values[i]; broadcast(comm, oa, root); } else { packed_iarchive ia(comm); broadcast(comm, ia, root); for (int i = 0; i < n; ++i) ia >> values[i]; } } } // end namespace detail template
void broadcast(const communicator& comm, T& value, int root) { detail::broadcast_impl(comm, &value, 1, root, is_mpi_datatype
()); } template
void broadcast(const communicator& comm, T* values, int n, int root) { detail::broadcast_impl(comm, values, n, root, is_mpi_datatype
()); } } } // end namespace boost::mpi // If the user has already included skeleton_and_content.hpp, include // the code to broadcast skeletons and content. #ifdef BOOST_MPI_SKELETON_AND_CONTENT_HPP # include
#endif #endif // BOOST_MPI_BROADCAST_HPP
broadcast.hpp
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