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|
/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "types.h"
#include "Alloc.h"
#include <limits.h>
#ifdef ISTDLIB_MT
#include "Threading.h"
#endif
#if defined(MSVC)
#define STD_API_CALL __stdcall
#else
#define STD_API_CALL
#endif
#define NO_VTABLE __declspec(novtable)
namespace iSTD
{
/*****************************************************************************\
Class:
CObject
Description:
Base class for all objects
\*****************************************************************************/
template<class CAllocatorType>
class NO_VTABLE CObject
{
public:
long Acquire( void );
long Release( void );
long GetRefCount( void ) const;
static long STD_API_CALL SafeAcquire(CObject* ptr);
static long STD_API_CALL SafeRelease(CObject* ptr);
void* operator new( size_t size );
void* operator new[]( size_t size );
void* operator new( size_t size, void* placement);
void operator delete(void* ptr);
void operator delete[]( void* ptr );
void operator delete(void* ptr, void* placement);
protected:
CObject( void );
virtual ~CObject(void);
#ifdef ISTDLIB_MT
volatile long m_RefCount;
#else
long m_RefCount;
#endif
};
/*****************************************************************************\
Function:
CObject constructor
Description:
Initializes internal data
Input:
default
Output:
none
\*****************************************************************************/
template<class CAllocatorType>
inline CObject<CAllocatorType>::CObject( void )
{
#ifdef ISTDLIB_MT
ASSERT( IsAligned( (void*)&m_RefCount, sizeof(DWORD) ) );
#endif
m_RefCount = 0;
}
/*****************************************************************************\
Function:
CObject destructor
Description:
Deletes internal data
Input:
default
Output:
none
\*****************************************************************************/
template<class CAllocatorType>
inline CObject<CAllocatorType>::~CObject(void)
{
ASSERT( m_RefCount == 0 );
}
/*****************************************************************************\
Function:
CObject::Acquire
Description:
Increments and returns the current reference count
Input:
none
Output:
long - reference count
\*****************************************************************************/
template<class CAllocatorType>
inline long CObject<CAllocatorType>::Acquire( void )
{
ASSERT( m_RefCount >= 0 );
ASSERT( m_RefCount < LONG_MAX );
#if defined(ISTDLIB_MT) && defined(__linux__)
__sync_fetch_and_add(&m_RefCount, 1);
#elif defined(ISTDLIB_MT)
::InterlockedIncrement(&m_RefCount);
#else
++m_RefCount;
#endif
return m_RefCount;
}
/*****************************************************************************\
Function:
CObject::Release
Description:
Decrements the current reference count. Deletes the object when the
reference count reaches zero. Returns the current reference count.
Input:
none
Output:
long - reference count
\*****************************************************************************/
template<class CAllocatorType>
inline long CObject<CAllocatorType>::Release( void )
{
ASSERT( m_RefCount > 0 );
#if defined(ISTDLIB_MT) && defined(__linux__)
__sync_sub_and_fetch(&m_RefCount, 1);
#elif defined(ISTDLIB_MT)
::InterlockedDecrement(&m_RefCount);
#else
--m_RefCount;
#endif
if( m_RefCount == 0 )
{
delete this;
return 0;
}
else
{
return m_RefCount;
}
}
/*****************************************************************************\
Function:
CObject::GetRefCount
Description:
Returns the current reference count.
Input:
none
Output:
long - reference count
\*****************************************************************************/
template<class CAllocatorType>
inline long CObject<CAllocatorType>::GetRefCount( void ) const
{
return m_RefCount;
}
/*****************************************************************************\
Function:
CObject::SafeAcquire
Description:
Static function that calls the object's acquire function if the object
exists
Input:
CObject* ptr - pointer to object to acquire
Output:
long - reference count
\*****************************************************************************/
template<class CAllocatorType>
inline long CObject<CAllocatorType>::SafeAcquire( CObject* ptr )
{
if( ptr )
{
return ptr->Acquire();
}
else
{
return 0;
}
}
/*****************************************************************************\
Function:
CObject::SafeRelease
Description:
Static function that calls the object's release function if the object
exists
Input:
CObject* ptr - pointer to object to release
Output:
long - reference count
\*****************************************************************************/
template<class CAllocatorType>
inline long CObject<CAllocatorType>::SafeRelease( CObject* ptr )
{
if( ptr )
{
return ptr->Release();
}
else
{
return 0;
}
}
/*****************************************************************************\
operator new
\*****************************************************************************/
template<class CAllocatorType>
inline void* CObject<CAllocatorType>::operator new( size_t size )
{
ASSERT( size );
#ifdef ISTDLIB_MT
void* ptr = CAllocatorType::AlignedAllocate( size, sizeof(DWORD) );
#else
void* ptr = CAllocatorType::Allocate( size );
#endif
ASSERT( ptr );
return ptr;
}
/*****************************************************************************\
operator new[]
\*****************************************************************************/
template<class CAllocatorType>
inline void* CObject<CAllocatorType>::operator new[]( size_t size )
{
ASSERT( size );
#ifdef ISTDLIB_MT
void* ptr = CAllocatorType::AlignedAllocate( size, sizeof(DWORD) );
#else
void* ptr = CAllocatorType::Allocate( size );
#endif
ASSERT( ptr );
return ptr;
}
/*****************************************************************************\
operator new with placement
\*****************************************************************************/
template<class CAllocatorType>
inline void* CObject<CAllocatorType>::operator new( size_t size, void* placement )
{
ASSERT( size );
ASSERT( placement );
return placement;
}
/*****************************************************************************\
operator delete
\*****************************************************************************/
template<class CAllocatorType>
inline void CObject<CAllocatorType>::operator delete(void* ptr)
{
ASSERT( ptr );
#ifdef ISTDLIB_MT
CAllocatorType::AlignedDeallocate( ptr );
#else
CAllocatorType::Deallocate( ptr );
#endif
}
/*****************************************************************************\
operator delete[]
\*****************************************************************************/
template<class CAllocatorType>
inline void CObject<CAllocatorType>::operator delete[]( void* ptr )
{
ASSERT( ptr );
#ifdef ISTDLIB_MT
CAllocatorType::AlignedDeallocate( ptr );
#else
CAllocatorType::Deallocate( ptr );
#endif
}
/*****************************************************************************\
operator delete from placement
\*****************************************************************************/
template<class CAllocatorType>
inline void CObject<CAllocatorType>::operator delete( void* ptr, void* placement )
{
ASSERT( ptr );
ASSERT( placement );
ASSERT( ptr == placement );
}
} // iSTD
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