103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
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// Copyright (C) 2006 Douglas Gregor <doug.gregor -at- gmail.com>.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (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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/** @file request.hpp
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*
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* This header defines the class @c request, which contains a request
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* for non-blocking communication.
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*/
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#ifndef BOOST_MPI_REQUEST_HPP
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#define BOOST_MPI_REQUEST_HPP
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#include <boost/mpi/config.hpp>
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#include <boost/optional.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/mpi/packed_iarchive.hpp>
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namespace boost { namespace mpi {
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class status;
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class communicator;
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/**
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* @brief A request for a non-blocking send or receive.
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*
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* This structure contains information about a non-blocking send or
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* receive and will be returned from @c isend or @c irecv,
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* respectively.
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*/
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class BOOST_MPI_DECL request
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{
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public:
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/**
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* Constructs a NULL request.
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*/
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request();
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/**
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* Wait until the communication associated with this request has
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* completed, then return a @c status object describing the
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* communication.
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*/
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status wait();
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/**
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* Determine whether the communication associated with this request
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* has completed successfully. If so, returns the @c status object
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* describing the communication. Otherwise, returns an empty @c
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* optional<> to indicate that the communication has not completed
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* yet. Note that once @c test() returns a @c status object, the
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* request has completed and @c wait() should not be called.
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*/
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optional<status> test();
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/**
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* Cancel a pending communication, assuming it has not already been
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* completed.
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*/
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void cancel();
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private:
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enum request_action { ra_wait, ra_test, ra_cancel };
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typedef optional<status> (*handler_type)(request* self,
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request_action action);
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/**
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* INTERNAL ONLY
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*
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* Handles the non-blocking receive of a serialized value.
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*/
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template<typename T>
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static optional<status>
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handle_serialized_irecv(request* self, request_action action);
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/**
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* INTERNAL ONLY
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*
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* Handles the non-blocking receive of an array of serialized values.
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*/
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template<typename T>
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static optional<status>
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handle_serialized_array_irecv(request* self, request_action action);
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public: // template friends are not portable
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/// INTERNAL ONLY
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MPI_Request m_requests[2];
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/// INTERNAL ONLY
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handler_type m_handler;
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/// INTERNAL ONLY
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shared_ptr<void> m_data;
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friend class communicator;
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};
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} } // end namespace boost::mpi
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#endif // BOOST_MPI_REQUEST_HPP
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