146 lines
4.3 KiB
Plaintext
146 lines
4.3 KiB
Plaintext
// Copyright (C) 2005, 2006 Douglas Gregor <doug.gregor -at- gmail.com>.
|
|
|
|
// 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 <boost/mpi/collectives_fwd.hpp>
|
|
#include <boost/mpi/exception.hpp>
|
|
#include <boost/mpi/datatype.hpp>
|
|
#include <boost/mpi/communicator.hpp>
|
|
|
|
namespace boost { namespace mpi {
|
|
|
|
/************************************************************************
|
|
* Specializations *
|
|
************************************************************************/
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
BOOST_MPI_DECL void
|
|
broadcast<const packed_oarchive>(const communicator& comm,
|
|
const packed_oarchive& oa,
|
|
int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
BOOST_MPI_DECL void
|
|
broadcast<packed_oarchive>(const communicator& comm, packed_oarchive& oa,
|
|
int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
BOOST_MPI_DECL void
|
|
broadcast<packed_iarchive>(const communicator& comm, packed_iarchive& ia,
|
|
int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
BOOST_MPI_DECL void
|
|
broadcast<const packed_skeleton_oarchive>(const communicator& comm,
|
|
const packed_skeleton_oarchive& oa,
|
|
int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
void
|
|
broadcast<packed_skeleton_oarchive>(const communicator& comm,
|
|
packed_skeleton_oarchive& oa, int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
void
|
|
broadcast<packed_skeleton_iarchive>(const communicator& comm,
|
|
packed_skeleton_iarchive& ia, int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
void broadcast<content>(const communicator& comm, content& c, int root);
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<>
|
|
void broadcast<const content>(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<typename T>
|
|
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<T>(*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<typename T>
|
|
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<typename T>
|
|
void broadcast(const communicator& comm, T& value, int root)
|
|
{
|
|
detail::broadcast_impl(comm, &value, 1, root, is_mpi_datatype<T>());
|
|
}
|
|
|
|
template<typename T>
|
|
void broadcast(const communicator& comm, T* values, int n, int root)
|
|
{
|
|
detail::broadcast_impl(comm, values, n, root, is_mpi_datatype<T>());
|
|
}
|
|
|
|
} } // 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 <boost/mpi/detail/broadcast_sc.hpp>
|
|
#endif
|
|
|
|
#endif // BOOST_MPI_BROADCAST_HPP
|