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