fixedAllocator.h

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
 *                                                                          *
 *   Copyright (c) 2005-2025 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
 *   The aGrUM/pyAgrum library is free software; you can redistribute it    *
 *   and/or modify it under the terms of either :                           *
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 *    - the GNU Lesser General Public License as published by               *
 *      the Free Software Foundation, either version 3 of the License,      *
 *      or (at your option) any later version,                              *
 *    - the MIT license (MIT),                                              *
 *    - or both in dual license, as here.                                   *
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 *   (see https://agrum.gitlab.io/articles/dual-licenses-lgplv3mit.html)    *
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 *   See LICENCES for more details.                                         *
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 *   SPDX-FileCopyrightText: Copyright 2005-2025                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
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 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
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 ****************************************************************************/
 

#ifndef GUM_FIXED_ALLOCATOR_H
#define GUM_FIXED_ALLOCATOR_H
 
// ============================================================================
#include <mutex>
#include <thread>
// ============================================================================
#include <agrum/agrum.h>
 
// ============================================================================
 
namespace gum {
 
  class FixedAllocator {
    // clang-format off
    // clang-format on
 
    struct _Chunk_ {
      // ============================================================================
      // ============================================================================
      void _init_(const std::size_t& blockSize, const unsigned char& numBlocks);
 
      // ============================================================================
      // ============================================================================
      void* _allocate_(const std::size_t& blockSize);
 
      // ============================================================================
      // ============================================================================
      void _deallocat_(void* p, const std::size_t& blockSize);
 
      // ============================================================================
      // ============================================================================
      void _release_();
 
      // ============================================================================
      // ============================================================================
      unsigned char* _pData_;
 
      // ============================================================================
      // ============================================================================
      unsigned char _firstAvailableBlock_;
 
      // ============================================================================
      // ============================================================================
      unsigned char _blocksAvailable_;
    };
 
    public:
    // ############################################################################
    // ############################################################################
 
    // ============================================================================
    // ============================================================================
    FixedAllocator(const std::size_t& blockSize, const unsigned char& numBlocks = UCHAR_MAX);
 
    // ============================================================================
    // ============================================================================
    ~FixedAllocator();

 
    // ############################################################################
    // ############################################################################
 
    // ============================================================================
    // ============================================================================
    void* allocate();
 
    // ============================================================================
    // ============================================================================
    void deallocate(void* pDeallocatedBlock);

 
    // ============================================================================
    // ============================================================================
    const size_t& objectSize() { return _blockSize_; }
 
    private:
    // ============================================================================
    // ============================================================================
    std::size_t _blockSize_;
 
    // ============================================================================
    // ============================================================================
    unsigned char _numBlocks_;
 
    // ============================================================================
    // ============================================================================
    using _Chunks_ = std::vector< _Chunk_ >;
    _Chunks_ _chunks_;
 
    // ============================================================================
    // ============================================================================
    _Chunks_::iterator _allocChunk_;
 
    // ============================================================================
    // ============================================================================
    _Chunks_::iterator _deallocChunk_;
  };
 
}   // namespace gum
 
#ifndef GUM_NO_INLINE
#  include <agrum/base/core/smallobjectallocator/fixedAllocator_inl.h>
#endif
 
#endif   // FIXEDALLOCATOR_H