108 lines
2.8 KiB
C++
108 lines
2.8 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 status.hpp
|
|
*
|
|
* This header defines the class @c status, which reports on the
|
|
* results of point-to-point communication.
|
|
*/
|
|
#ifndef BOOST_MPI_STATUS_HPP
|
|
#define BOOST_MPI_STATUS_HPP
|
|
|
|
#include <boost/mpi/config.hpp>
|
|
#include <boost/optional.hpp>
|
|
|
|
namespace boost { namespace mpi {
|
|
|
|
class request;
|
|
class communicator;
|
|
|
|
/** @brief Contains information about a message that has been or can
|
|
* be received.
|
|
*
|
|
* This structure contains status information about messages that
|
|
* have been received (with @c communicator::recv) or can be received
|
|
* (returned from @c communicator::probe or @c
|
|
* communicator::iprobe). It permits access to the source of the
|
|
* message, message tag, error code (rarely used), or the number of
|
|
* elements that have been transmitted.
|
|
*/
|
|
class BOOST_MPI_DECL status
|
|
{
|
|
public:
|
|
status() : m_count(-1) { }
|
|
|
|
status(MPI_Status const& s) : m_status(s), m_count(-1) {}
|
|
|
|
/**
|
|
* Retrieve the source of the message.
|
|
*/
|
|
int source() const { return m_status.MPI_SOURCE; }
|
|
|
|
/**
|
|
* Retrieve the message tag.
|
|
*/
|
|
int tag() const { return m_status.MPI_TAG; }
|
|
|
|
/**
|
|
* Retrieve the error code.
|
|
*/
|
|
int error() const { return m_status.MPI_ERROR; }
|
|
|
|
/**
|
|
* Determine whether the communication associated with this object
|
|
* has been successfully cancelled.
|
|
*/
|
|
bool cancelled() const;
|
|
|
|
/**
|
|
* Determines the number of elements of type @c T contained in the
|
|
* message. The type @c T must have an associated data type, i.e.,
|
|
* @c is_mpi_datatype<T> must derive @c mpl::true_. In cases where
|
|
* the type @c T does not match the transmitted type, this routine
|
|
* will return an empty @c optional<int>.
|
|
*
|
|
* @returns the number of @c T elements in the message, if it can be
|
|
* determined.
|
|
*/
|
|
template<typename T> optional<int> count() const;
|
|
|
|
/**
|
|
* References the underlying @c MPI_Status
|
|
*/
|
|
operator MPI_Status&() { return m_status; }
|
|
|
|
/**
|
|
* References the underlying @c MPI_Status
|
|
*/
|
|
operator const MPI_Status&() const { return m_status; }
|
|
|
|
private:
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<typename T> optional<int> count_impl(mpl::true_) const;
|
|
|
|
/**
|
|
* INTERNAL ONLY
|
|
*/
|
|
template<typename T> optional<int> count_impl(mpl::false_) const;
|
|
|
|
public: // friend templates are not portable
|
|
|
|
/// INTERNAL ONLY
|
|
mutable MPI_Status m_status;
|
|
mutable int m_count;
|
|
|
|
friend class communicator;
|
|
friend class request;
|
|
};
|
|
|
|
|
|
} } // end namespace boost::mpi
|
|
|
|
#endif // BOOST_MPI_STATUS_HPP
|