Gabriele Cosmo
317 lines
9.4 KiB
C++
317 lines
9.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4CacheDetails
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//
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// Class description:
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//
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// The classes contained in this header files are used by
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// G4Cache to store a TLS instance of the cached object.
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// These classes should not be used by client code, but
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// are used by one of the G4Cache classes.
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//
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// G4Cache is a container of the cached value.
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// Not memory efficient, but CPU efficient (constant time access).
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// A different version with a map instead of a vector should be
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// memory efficient and less CPU efficient (log-time access).
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// If really a lot of these objects are used
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// we may want to consider the map version to save some memory.
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//
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// These are simplified "split-classes" without any
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// copy-from-master logic. Each cached object is associated
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// a unique identified (an integer), that references an instance
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// of the cached value (of template type VALTYPE) in a
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// static TLS data structure.
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//
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// In case the cache is used for a cached object the object class
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// has to provide a default constructor. Alternatively pointers to
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// objects can be stored in the cache and this limitation is removed
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// but explicit handling of memory (new/delete) of cached object becomes
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// client responsibility.
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//
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// Todos: - Understand if map based class can be more efficent than
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// vector one.
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// - Evaluate use of specialized allocator for TLS "new".
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// Author: A.Dotti, 21 October 2013 - First implementation
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// --------------------------------------------------------------------
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#ifndef G4CacheDetails_hh
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#define G4CacheDetails_hh
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#include "G4Threading.hh"
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#include "globals.hh"
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#include <vector>
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// A TLS storage for a cache of type VALTYPE
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//
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template <class VALTYPE>
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class G4CacheReference
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{
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public:
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inline void Initialize(unsigned int id);
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// Initliaze TLS storage
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inline void Destroy(unsigned int id, G4bool last);
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// Cleanup TLS storage for instance id. If last==true
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// destroy and cleanup object container
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inline VALTYPE& GetCache(unsigned int id) const;
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// Returns cached value for instance id
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private:
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using cache_container = std::vector<VALTYPE*>;
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// Implementation detail: the cached object is stored as a
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// pointer. Object is stored as a pointer to avoid too large
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// std::vector in case of stored objects and allow use of
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// specialized allocators
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static cache_container*& cache();
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};
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// Template specialization for pointers
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// Note: Objects are not owned by cache, for this version of the cache
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// the explicit new/delete of the cached object
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//
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template <class VALTYPE>
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class G4CacheReference<VALTYPE*>
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{
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public:
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inline void Initialize(unsigned int id);
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inline void Destroy(unsigned int id, G4bool last);
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inline VALTYPE*& GetCache(unsigned int id) const;
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private:
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using cache_container = std::vector<VALTYPE*>;
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static cache_container*& cache();
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};
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// Template specialization for probably the most used case: double
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// Be more efficient avoiding unnecessary "new/delete"
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//
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template <>
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class G4CacheReference<G4double>
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{
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public:
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inline void Initialize(unsigned int id);
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inline void Destroy(unsigned int id, G4bool last);
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inline G4double& GetCache(unsigned int id) const;
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private:
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using cache_container = std::vector<G4double>;
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static G4GLOB_DLL cache_container*& cache();
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};
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//======= Implementation: G4CacheReference<V>
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//===========================================
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template <class V>
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void G4CacheReference<V>::Initialize(unsigned int id)
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{
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// Create cache container
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if(cache() == nullptr)
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{
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#ifdef g4cdebug
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std::cout << "Generic template container..." << std::endl;
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#endif
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cache() = new cache_container;
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}
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if(cache()->size() <= id)
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{
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cache()->resize(id + 1, static_cast<V*>(0));
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}
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if((*cache())[id] == 0)
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{
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(*cache())[id] = new V;
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}
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}
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template <class V>
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void G4CacheReference<V>::Destroy(unsigned int id, G4bool last)
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{
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if(cache() != nullptr)
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{
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#ifdef g4cdebug
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std::cout << "V: Destroying element " << id << " is last? " << last
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<< std::endl;
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#endif
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if(cache()->size() < id)
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{
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G4ExceptionDescription msg;
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msg << "Internal fatal error. Invalid G4Cache size (requested id: " << id
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<< " but cache has size: " << cache()->size();
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msg << " Possibly client created G4Cache object in a thread and"
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<< " tried to delete it from another thread!";
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G4Exception("G4CacheReference<V>::Destroy", "Cache001", FatalException,
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msg);
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return;
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}
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if(cache()->size() > id && (*cache())[id] != nullptr)
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{
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#ifdef g4cdebug
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std::cout << "V: Destroying element " << id
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<< " size: " << cache()->size() << std::endl;
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#endif
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delete(*cache())[id];
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(*cache())[id] = nullptr;
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}
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if(last)
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{
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#ifdef g4cdebug
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std::cout << "V: Destroying LAST element!" << std::endl;
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#endif
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delete cache();
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cache() = nullptr;
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}
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}
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}
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template <class V>
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V& G4CacheReference<V>::GetCache(unsigned int id) const
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{
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return *(cache()->operator[](id));
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}
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template <class V>
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typename G4CacheReference<V>::cache_container*& G4CacheReference<V>::cache()
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{
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G4ThreadLocalStatic cache_container* _instance = nullptr;
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return _instance;
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}
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//======= Implementation: G4CacheReference<V*>
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//============================================
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template <class V>
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void G4CacheReference<V*>::Initialize(unsigned int id)
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{
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if(cache() == nullptr)
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{
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#ifdef g4cdebug
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std::cout << "Pointer template container..." << std::endl;
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#endif
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cache() = new cache_container;
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}
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if(cache()->size() <= id)
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{
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cache()->resize(id + 1, static_cast<V*>(nullptr));
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}
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}
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template <class V>
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inline void G4CacheReference<V*>::Destroy(unsigned int id, G4bool last)
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{
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if(cache() != nullptr)
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{
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#ifdef g4cdebug
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std::cout << "V*: Destroying element " << id << " is last? " << last
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<< std::endl;
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#endif
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if(cache()->size() < id)
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{
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G4ExceptionDescription msg;
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msg << "Internal fatal error. Invalid G4Cache size (requested id: " << id
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<< " but cache has size: " << cache()->size();
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msg << " Possibly client created G4Cache object in a thread and"
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<< " tried to delete it from another thread!";
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G4Exception("G4CacheReference<V*>::Destroy", "Cache001", FatalException,
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msg);
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return;
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}
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if(cache()->size() > id && (*cache())[id] != nullptr)
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{
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// Ownership is for client
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// delete (*cache())[id];
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#ifdef g4cdebug
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std::cout << "V*: Resetting element " << id
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<< " size: " << cache()->size() << std::endl;
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#endif
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(*cache())[id] = nullptr;
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}
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if(last)
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{
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#ifdef g4cdebug
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std::cout << "V*: Deleting LAST element!" << std::endl;
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#endif
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delete cache();
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cache() = nullptr;
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}
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}
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}
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template <class V>
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V*& G4CacheReference<V*>::GetCache(unsigned int id) const
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{
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return (cache()->operator[](id));
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}
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template <class V>
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typename G4CacheReference<V*>::cache_container*& G4CacheReference<V*>::cache()
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{
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G4ThreadLocalStatic cache_container* _instance = nullptr;
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return _instance;
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}
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//======= Implementation: G4CacheReference<double>
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//============================================
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void G4CacheReference<G4double>::Initialize(unsigned int id)
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{
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if(cache() == nullptr)
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{
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#ifdef g4cdebug
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std::cout << "Specialized template for G4double container..." << std::endl;
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#endif
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cache() = new cache_container;
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}
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if(cache()->size() <= id)
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{
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cache()->resize(id + 1, static_cast<G4double>(0));
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}
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}
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void G4CacheReference<G4double>::Destroy(unsigned int /*id*/, G4bool last)
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{
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if(cache() != nullptr && last)
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{
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#ifdef g4cdebug
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std::cout << "DB: Destroying LAST element! Is it last? " << last
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<< std::endl;
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#endif
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delete cache();
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cache() = nullptr;
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}
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}
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G4double& G4CacheReference<G4double>::GetCache(unsigned int id) const
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{
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return cache()->operator[](id);
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}
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#endif
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