MpiContigMachineShMemWinBaseInternal.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/* MpiContigMachineShMemWinBaseInternal.h                      (C) 2000-2026 */
/*                                                                           */
/* Class allowing the creation of a memory window for a computing node with  */
/* MPI. This window will be contiguous for all processes on the same node.   */
/*---------------------------------------------------------------------------*/
 
#ifndef ARCCORE_MESSAGEPASSINGMPI_INTERNAL_MPICONTIGMACHINESHMEMWINBASEINTERNAL_H
#define ARCCORE_MESSAGEPASSINGMPI_INTERNAL_MPICONTIGMACHINESHMEMWINBASEINTERNAL_H
 
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/*---------------------------------------------------------------------------*/
 
#include "arccore/collections/Array.h"
#include "arccore/message_passing/internal/IContigMachineShMemWinBaseInternal.h"
 
#include "arccore/message_passing_mpi/MessagePassingMpiGlobal.h"
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
namespace Arcane::MessagePassing::Mpi
{
 
class ARCCORE_MESSAGEPASSINGMPI_EXPORT MpiContigMachineShMemWinBaseInternal
: public IContigMachineShMemWinBaseInternal
{
 public:
 
  explicit MpiContigMachineShMemWinBaseInternal(Int64 sizeof_segment, Int32 sizeof_type, const MPI_Comm& comm_machine, Int32 comm_machine_rank, Int32 comm_machine_size, ConstArrayView<Int32> machine_ranks);
 
  ~MpiContigMachineShMemWinBaseInternal() override;
 
 public:
 
  Int32 sizeofOneElem() const override;
 
  Span<std::byte> segmentView() override;
  Span<std::byte> segmentView(Int32 rank) override;
  Span<std::byte> windowView() override;
 
  Span<const std::byte> segmentConstView() const override;
  Span<const std::byte> segmentConstView(Int32 rank) const override;
  Span<const std::byte> windowConstView() const override;
 
  void resizeSegment(Int64 new_sizeof_segment) override;
 
  ConstArrayView<Int32> machineRanks() const override;
 
  void barrier() const override;
 
 private:
 
  MPI_Win m_win;
  Span<std::byte> m_window_span;
 
  MPI_Win m_win_sizeof_segments;
  SmallSpan<Int64> m_sizeof_segments_span;
 
  MPI_Win m_win_sum_sizeof_segments;
  SmallSpan<Int64> m_sum_sizeof_segments_span;
 
  MPI_Comm m_comm_machine;
  Int32 m_comm_machine_size = 0;
  Int32 m_comm_machine_rank = 0;
 
  Int32 m_sizeof_type = 0;
 
  ConstArrayView<Int32> m_machine_ranks;
 
  Int64 m_max_sizeof_win = 0;
  Int64 m_actual_sizeof_win = 0;
};
 
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/*---------------------------------------------------------------------------*/
 
} // namespace Arcane::MessagePassing::Mpi
 
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#endif