smallObjectAllocator_inl.h

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
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 *   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    *
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 *   SPDX-FileCopyrightText: Copyright 2005-2025                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#pragma once
 

// ============================================================================
#include <agrum/base/core/smallobjectallocator/fixedAllocator.h>
#include <agrum/base/core/smallobjectallocator/smallObjectAllocator.h>
 
// ============================================================================
 
 
namespace gum {
 
  // ############################################################################
  // @name Constructors / Destructors
  // ############################################################################
 
  // ============================================================================
  /*
   * Constructor.
   * @param chunkSize is the size of a chunk in bytes.
   * @param maxObjectSize is the max size of object to be considered small
   * Greater object than maxObjectSize will be forwarded to op new.
   */
  // ============================================================================
  INLINE SmallObjectAllocator::SmallObjectAllocator() :
      _chunkSize_(GUM_DEFAULT_CHUNK_SIZE), _maxObjectSize_(GUM_DEFAULT_MAX_OBJECT_SIZE) {
    _pool_.setKeyUniquenessPolicy(false);
    GUM_CONSTRUCTOR(SmallObjectAllocator);
    nbAllocation   = 0;
    nbDeallocation = 0;
 
    // SmallObjectAllocator::Instance will create a static SmallObjectAllocator and
    // a HashTable that will not be deleted ...
    // so we inform our leak detector not to count those 2 objects
    GUM_DESTRUCTOR(SmallObjectAllocator);
    GUM_DESTRUCTOR(HashTable);
  }
 
  // ============================================================================
  // Destructor.
  // ============================================================================
  INLINE SmallObjectAllocator::~SmallObjectAllocator() {
    GUM_DESTRUCTOR(SmallObjectAllocator);
    for (_Pool_::iterator pit = _pool_.begin(); pit != _pool_.end(); ++pit)
      delete pit.val();
  }
 
  INLINE SmallObjectAllocator& SmallObjectAllocator::instance() {
    static SmallObjectAllocator soa;
 
    return soa;
  }
 
  // ############################################################################
  // @name Allocator / Deallocator
  // ############################################################################
 
  // ============================================================================
  // Allocates an object
  // ============================================================================
  INLINE void* SmallObjectAllocator::allocate(const size_t& objectSize) {
    // Small Object Allocator called for an object of size equals to 0
    GUM_ASSERT(objectSize > 0);
 
    // If objectSize is greater than maxObjectSize, normal new is called
    if (objectSize > _maxObjectSize_) return new unsigned char[objectSize];
 
    void* ret;
#pragma omp critical(soa)
    {
      //
      if (!_pool_.exists(Size(objectSize))) {
        // Calcul du nombre de block par chunk pour des objets de cette taille
        std::size_t nb = _chunkSize_ / Size(objectSize);
        if (nb > UCHAR_MAX) nb = UCHAR_MAX;
        unsigned char numBlocks = static_cast< unsigned char >(nb);
 
        FixedAllocator* newFa = new FixedAllocator(Size(objectSize), numBlocks);
        _pool_.set(Size(objectSize), newFa);
      }
      nbAllocation++;
 
      ret = _pool_[Size(objectSize)]->allocate();
    }
    return ret;
  }
 
  // ============================================================================
  // Deallocates an object
  // @param pDeallocatedObject is the object to be deallocated
  // @param objectSize is the size of that object (useful for faster
  // deallocation)
  // ============================================================================
  INLINE void SmallObjectAllocator::deallocate(void* pDeallocatedObject, const size_t& objectSize) {
    // Small Object Allocator called for an object of size equals to 0
    GUM_ASSERT(objectSize > 0);
 
    // If objectSize is greater than maxObjectSize, normal new is called
    if (objectSize > _maxObjectSize_) {
      delete[] (unsigned char*)pDeallocatedObject;
      return;
    }
 
#pragma omp critical(soa)
    {
      //      std::cout << "Deallocating " << pDeallocatedObject << std::endl;
      _pool_[Size(objectSize)]->deallocate(pDeallocatedObject);
      nbDeallocation++;
    }
  }
 
}   // namespace gum