SharedMemoryMachineShMemWinBaseInternal.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
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/* SharedMemoryMachineShMemWinBaseInternal.h                   (C) 2000-2026 */
/*                                                                           */
/* Class allowing the creation of memory windows for all subdomains in       */
/* shared memory.                                                            */
/* The segments of these windows are not contiguous in memory and can        */
/* be resized.                                                               */
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#ifndef ARCANE_PARALLEL_THREAD_INTERNAL_SHAREDMEMORYMACHINESHMEMWINBASEINTERNAL_H
#define ARCANE_PARALLEL_THREAD_INTERNAL_SHAREDMEMORYMACHINESHMEMWINBASEINTERNAL_H
 
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#include "arccore/message_passing/internal/IMachineShMemWinBaseInternal.h"
 
#include "arcane/core/ArcaneTypes.h"
#include "arcane/utils/Ref.h"
 
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namespace Arcane::MessagePassing
{
 
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class ARCANE_THREAD_EXPORT SharedMemoryMachineShMemWinBaseInternal
: public IMachineShMemWinBaseInternal
{
 public:
 
  SharedMemoryMachineShMemWinBaseInternal(Int32 my_rank, ConstArrayView<Int32> ranks, Int32 sizeof_type, Ref<UniqueArray<UniqueArray<std::byte>>> windows, Ref<UniqueArray<Int32>> target_segments, IThreadBarrier* barrier);
 
  ~SharedMemoryMachineShMemWinBaseInternal() override = default;
 
 public:
 
  Int32 sizeofOneElem() const override;
  ConstArrayView<Int32> machineRanks() const override;
  void barrier() const override;
 
  Span<std::byte> segmentView() override;
  Span<std::byte> segmentView(Int32 rank) override;
 
  Span<const std::byte> segmentConstView() const override;
  Span<const std::byte> segmentConstView(Int32 rank) const override;
 
  void add(Span<const std::byte> elem) override;
  void add() override;
 
  void addToAnotherSegment(Int32 rank, Span<const std::byte> elem) override;
  void addToAnotherSegment() override;
 
  void reserve(Int64 new_capacity) override;
  void reserve() override;
 
  void resize(Int64 new_size) override;
  void resize() override;
 
  void shrink() override;
 
 private:
 
  Int32 m_my_rank = 0;
  Int32 m_sizeof_type = 0;
  ConstArrayView<Int32> m_ranks;
 
  Ref<UniqueArray<UniqueArray<std::byte>>> m_windows;
  SmallSpan<UniqueArray<std::byte>> m_windows_span;
 
  Ref<UniqueArray<Int32>> m_target_segments;
  SmallSpan<Int32> m_target_segments_span;
 
  IThreadBarrier* m_barrier = nullptr;
};
 
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} // namespace Arcane::MessagePassing
 
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#endif