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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\mpi\intercommunicator.hpp
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// Copyright (C) 2007 The Trustees of Indiana University. // Authors: Douglas Gregor // Andrew Lumsdaine // 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) /** @file intercommunicator.hpp * * This header defines the @c intercommunicator class, which permits * communication between different process groups. */ #ifndef BOOST_MPI_INTERCOMMUNICATOR_HPP #define BOOST_MPI_INTERCOMMUNICATOR_HPP #include
namespace boost { namespace mpi { /** * INTERNAL ONLY * * Forward declaration of the MPI "group" representation, for use in * the description of the @c intercommunicator class. */ class group; /** * @brief Communication facilities among processes in different * groups. * * The @c intercommunicator class provides communication facilities * among processes from different groups. An intercommunicator is * always associated with two process groups: one "local" process * group, containing the process that initiates an MPI operation * (e.g., the sender in a @c send operation), and one "remote" process * group, containing the process that is the target of the MPI * operation. * * While intercommunicators have essentially the same point-to-point * operations as intracommunicators (the latter communicate only * within a single process group), all communication with * intercommunicators occurs between the processes in the local group * and the processes in the remote group; communication within a group * must use a different (intra-)communicator. * */ class BOOST_MPI_DECL intercommunicator : public communicator { private: friend class communicator; /** * INTERNAL ONLY * * Construct an intercommunicator given a shared pointer to the * underlying MPI_Comm. This operation is used for "casting" from a * communicator to an intercommunicator. */ explicit intercommunicator(const shared_ptr
& comm_ptr) { this->comm_ptr = comm_ptr; } public: /** * Build a new Boost.MPI intercommunicator based on the MPI * intercommunicator @p comm. * * @p comm may be any valid MPI intercommunicator. If @p comm is * MPI_COMM_NULL, an empty communicator (that cannot be used for * communication) is created and the @p kind parameter is * ignored. Otherwise, the @p kind parameter determines how the * Boost.MPI communicator will be related to @p comm: * * - If @p kind is @c comm_duplicate, duplicate @c comm to create * a new communicator. This new communicator will be freed when * the Boost.MPI communicator (and all copies of it) is * destroyed. This option is only permitted if the underlying MPI * implementation supports MPI 2.0; duplication of * intercommunicators is not available in MPI 1.x. * * - If @p kind is @c comm_take_ownership, take ownership of @c * comm. It will be freed automatically when all of the Boost.MPI * communicators go out of scope. * * - If @p kind is @c comm_attach, this Boost.MPI communicator * will reference the existing MPI communicator @p comm but will * not free @p comm when the Boost.MPI communicator goes out of * scope. This option should only be used when the communicator is * managed by the user. */ intercommunicator(const MPI_Comm& comm, comm_create_kind kind) : communicator(comm, kind) { } /** * Constructs a new intercommunicator whose local group is @p local * and whose remote group is @p peer. The intercommunicator can then * be used to communicate between processes in the two groups. This * constructor is equivalent to a call to @c MPI_Intercomm_create. * * @param local The intracommunicator containing all of the * processes that will go into the local group. * * @param local_leader The rank within the @p local * intracommunicator that will serve as its leader. * * @param peer The intracommunicator containing all of the processes * that will go into the remote group. * * @param remote_leader The rank within the @p peer group that will * serve as its leader. */ intercommunicator(const communicator& local, int local_leader, const communicator& peer, int remote_leader); /** * Returns the size of the local group, i.e., the number of local * processes that are part of the group. */ int local_size() const { return this->size(); } /** * Returns the local group, containing all of the local processes in * this intercommunicator. */ boost::mpi::group local_group() const; /** * Returns the rank of this process within the local group. */ int local_rank() const { return this->rank(); } /** * Returns the size of the remote group, i.e., the number of * processes that are part of the remote group. */ int remote_size() const; /** * Returns the remote group, containing all of the remote processes * in this intercommunicator. */ boost::mpi::group remote_group() const; /** * Merge the local and remote groups in this intercommunicator into * a new intracommunicator containing the union of the processes in * both groups. This method is equivalent to @c MPI_Intercomm_merge. * * @param high Whether the processes in this group should have the * higher rank numbers than the processes in the other group. Each * of the processes within a particular group shall have the same * "high" value. * * @returns the new, merged intracommunicator */ communicator merge(bool high) const; }; } } // end namespace boost::mpi #endif // BOOST_MPI_INTERCOMMUNICATOR_HPP
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