aa1b96d9c4
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@227 7ec92016-0320-0410-acc4-a06ded1c099a
288 lines
9.8 KiB
C++
288 lines
9.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
// The Loki Library
|
|
// Copyright (c) 2001 by Andrei Alexandrescu
|
|
// This code accompanies the book:
|
|
// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
|
|
// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
|
|
// Permission to use, copy, modify, distribute and sell this software for any
|
|
// purpose is hereby granted without fee, provided that the above copyright
|
|
// notice appear in all copies and that both that copyright notice and this
|
|
// permission notice appear in supporting documentation.
|
|
// The author or Addison-Wesley Longman make no representations about the
|
|
// suitability of this software for any purpose. It is provided "as is"
|
|
// without express or implied warranty.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// $Header$
|
|
|
|
|
|
#ifndef SMALLOBJ_INC_
|
|
#define SMALLOBJ_INC_
|
|
|
|
#include "Threads.h"
|
|
#include "Singleton.h"
|
|
#include <cstddef>
|
|
#include <new> // needed for std::nothrow_t parameter.
|
|
|
|
#ifndef DEFAULT_CHUNK_SIZE
|
|
#define DEFAULT_CHUNK_SIZE 4096
|
|
#endif
|
|
|
|
#ifndef MAX_SMALL_OBJECT_SIZE
|
|
#define MAX_SMALL_OBJECT_SIZE 256
|
|
#endif
|
|
|
|
#ifndef LOKI_DEFAULT_OBJECT_ALIGNMENT
|
|
#define LOKI_DEFAULT_OBJECT_ALIGNMENT 4
|
|
#endif
|
|
|
|
|
|
namespace Loki
|
|
{
|
|
class FixedAllocator;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class SmallObjAllocator
|
|
// Manages pool of fixed-size allocators.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
class SmallObjAllocator
|
|
{
|
|
protected:
|
|
SmallObjAllocator( std::size_t pageSize, std::size_t maxObjectSize,
|
|
std::size_t objectAlignSize );
|
|
|
|
~SmallObjAllocator( void );
|
|
|
|
public:
|
|
void * Allocate( std::size_t size, bool doThrow );
|
|
|
|
void Deallocate( void * p, std::size_t size );
|
|
|
|
inline std::size_t GetMaxObjectSize() const { return maxSmallObjectSize_; }
|
|
|
|
inline std::size_t GetAlignment() const { return objectAlignSize_; }
|
|
|
|
private:
|
|
/// Copy-constructor is not implemented.
|
|
SmallObjAllocator( const SmallObjAllocator & );
|
|
/// Copy-assignment operator is not implemented.
|
|
SmallObjAllocator & operator = ( const SmallObjAllocator & );
|
|
|
|
Loki::FixedAllocator * pool_;
|
|
|
|
std::size_t maxSmallObjectSize_;
|
|
|
|
std::size_t objectAlignSize_;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class AllocatorSingleton
|
|
// This template class is derived from SmallObjAllocator in order to pass template
|
|
// arguments into SmallObjAllocator, and still have a default constructor for the
|
|
// singleton.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
template <class> class ThreadingModel,
|
|
std::size_t chunkSize,
|
|
std::size_t maxSmallObjectSize,
|
|
std::size_t objectAlignSize
|
|
>
|
|
class AllocatorSingleton : public SmallObjAllocator
|
|
{
|
|
public:
|
|
inline AllocatorSingleton() :
|
|
SmallObjAllocator( chunkSize, maxSmallObjectSize, objectAlignSize )
|
|
{}
|
|
inline ~AllocatorSingleton( void ) {}
|
|
|
|
private:
|
|
/// Copy-constructor is not implemented.
|
|
AllocatorSingleton( const AllocatorSingleton & );
|
|
/// Copy-assignment operator is not implemented.
|
|
AllocatorSingleton & operator = ( const AllocatorSingleton & );
|
|
};
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class SmallObjectBase
|
|
// Base class for small object allocation classes.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
template <class> class ThreadingModel,
|
|
std::size_t chunkSize,
|
|
std::size_t maxSmallObjectSize,
|
|
std::size_t objectAlignSize,
|
|
template <class> class LifetimePolicy
|
|
>
|
|
class SmallObjectBase
|
|
{
|
|
|
|
#if (MAX_SMALL_OBJECT_SIZE != 0) && (DEFAULT_CHUNK_SIZE != 0) && (LOKI_DEFAULT_OBJECT_ALIGNMENT != 0)
|
|
|
|
/// Defines type of allocator.
|
|
typedef AllocatorSingleton< ThreadingModel, chunkSize,
|
|
maxSmallObjectSize, objectAlignSize > MyAllocator;
|
|
|
|
/// Defines type for thread-safety locking mechanism.
|
|
typedef ThreadingModel< MyAllocator > MyThreadingModel;
|
|
|
|
/// Defines singleton made from allocator.
|
|
typedef Loki::SingletonHolder< MyAllocator, Loki::CreateStatic,
|
|
LifetimePolicy, ThreadingModel > MyAllocatorSingleton;
|
|
|
|
public:
|
|
|
|
/// Throwing single-object new.
|
|
#ifdef _MSC_VER
|
|
/// @note MSVC complains about non-empty exception specification lists.
|
|
static void * operator new ( std::size_t size )
|
|
#else
|
|
static void * operator new ( std::size_t size ) throw ( std::bad_alloc )
|
|
#endif
|
|
{
|
|
typename MyThreadingModel::Lock lock;
|
|
(void)lock; // get rid of warning
|
|
return MyAllocatorSingleton::Instance().Allocate( size, true );
|
|
}
|
|
|
|
/// Non-throwing single-object new.
|
|
static void * operator new ( std::size_t size, const std::nothrow_t & ) throw ()
|
|
{
|
|
typename MyThreadingModel::Lock lock;
|
|
(void)lock; // get rid of warning
|
|
return MyAllocatorSingleton::Instance().Allocate( size, false );
|
|
}
|
|
|
|
/// Placement single-object new.
|
|
inline static void * operator new ( std::size_t size, void * place )
|
|
{
|
|
return ::operator new( size, place );
|
|
}
|
|
|
|
/// Single-object delete.
|
|
static void operator delete ( void * p, std::size_t size ) throw ()
|
|
{
|
|
typename MyThreadingModel::Lock lock;
|
|
(void)lock; // get rid of warning
|
|
MyAllocatorSingleton::Instance().Deallocate( p, size );
|
|
}
|
|
|
|
/// Non-throwing single-object delete.
|
|
static void operator delete ( void * p, std::size_t size,
|
|
const std::nothrow_t & ) throw()
|
|
{
|
|
typename MyThreadingModel::Lock lock;
|
|
(void)lock; // get rid of warning
|
|
MyAllocatorSingleton::Instance().Deallocate( p, size );
|
|
}
|
|
|
|
/// Placement single-object delete.
|
|
inline static void operator delete ( void * p, void * place )
|
|
{
|
|
::operator delete ( p, place );
|
|
}
|
|
|
|
#endif // #if default template parameters are not zero
|
|
|
|
protected:
|
|
inline SmallObjectBase( void ) {}
|
|
inline SmallObjectBase( const SmallObjectBase & ) {}
|
|
inline SmallObjectBase & operator = ( const SmallObjectBase & ) {}
|
|
inline ~SmallObjectBase() {}
|
|
}; // end class SmallObjectBase
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class SmallObject
|
|
// Base class for polymorphic small objects, offers fast allocations &
|
|
// deallocations. Destructor is virtual and public.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
template <class> class ThreadingModel = DEFAULT_THREADING_NO_OBJ_LEVEL,
|
|
std::size_t chunkSize = DEFAULT_CHUNK_SIZE,
|
|
std::size_t maxSmallObjectSize = MAX_SMALL_OBJECT_SIZE,
|
|
std::size_t objectAlignSize = LOKI_DEFAULT_OBJECT_ALIGNMENT,
|
|
template <class> class LifetimePolicy = Loki::NoDestroy
|
|
>
|
|
class SmallObject : public SmallObjectBase< ThreadingModel, chunkSize,
|
|
maxSmallObjectSize, objectAlignSize, LifetimePolicy >
|
|
{
|
|
|
|
public:
|
|
virtual ~SmallObject() {}
|
|
protected:
|
|
inline SmallObject( void ) {}
|
|
|
|
private:
|
|
/// Copy-constructor is not implemented.
|
|
SmallObject( const SmallObject & );
|
|
/// Copy-assignment operator is not implemented.
|
|
SmallObject & operator = ( const SmallObject & );
|
|
}; // end class SmallObject
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// class SmallValueObject
|
|
// Base class for small objects with value semantics - offers fast allocations &
|
|
// deallocations. Destructor is non-virtual, inline, and protected.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
template
|
|
<
|
|
template <class> class ThreadingModel = DEFAULT_THREADING_NO_OBJ_LEVEL,
|
|
std::size_t chunkSize = DEFAULT_CHUNK_SIZE,
|
|
std::size_t maxSmallObjectSize = MAX_SMALL_OBJECT_SIZE,
|
|
std::size_t objectAlignSize = LOKI_DEFAULT_OBJECT_ALIGNMENT,
|
|
template <class> class LifetimePolicy = Loki::NoDestroy
|
|
>
|
|
class SmallValueObject : public SmallObjectBase< ThreadingModel, chunkSize,
|
|
maxSmallObjectSize, objectAlignSize, LifetimePolicy >
|
|
{
|
|
protected:
|
|
inline SmallValueObject( void ) {}
|
|
inline SmallValueObject( const SmallValueObject & ) {}
|
|
inline SmallValueObject & operator = ( const SmallValueObject & ) {}
|
|
inline ~SmallValueObject() {}
|
|
}; // end class SmallValueObject
|
|
|
|
} // namespace Loki
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Change log:
|
|
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
|
|
// Nov. 26, 2004: re-implemented by Rich Sposato.
|
|
//
|
|
// $Log$
|
|
// Revision 1.7 2005/09/01 22:01:33 rich_sposato
|
|
// Added #ifdef to deal with MSVC warning about exception specification lists.
|
|
//
|
|
// Revision 1.6 2005/08/27 13:22:56 syntheticpp
|
|
// samll fix
|
|
//
|
|
// Revision 1.5 2005/08/25 15:49:51 syntheticpp
|
|
// small corrections
|
|
//
|
|
// Revision 1.4 2005/08/25 15:23:14 syntheticpp
|
|
// small corrections
|
|
//
|
|
// Revision 1.3 2005/07/31 14:00:48 syntheticpp
|
|
// make object level threading possible
|
|
//
|
|
// Revision 1.2 2005/07/31 13:51:31 syntheticpp
|
|
// replace old implementation with the ingeious from Rich Sposato
|
|
//
|
|
// Revision 1.2 2005/07/22 00:22:38 rich_sposato
|
|
// Added SmallValueObject, SmallObjectBase, and AllocatorSingleton classes.
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#endif // SMALLOBJ_INC_
|
|
|