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/*
* HeapMemory.cpp
*
* Created on: Aug 17, 2014
* Author: Pietro Incardona
*/
#include "HeapMemory.hpp"
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#include <cstddef>
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typedef unsigned char byte;
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/*! \brief Allocate a chunk of memory
*
* Allocate a chunk of memory
*
* \param sz size of the chunk of memory to allocate in byte
*
*/
bool HeapMemory::allocate(size_t sz)
{
//! Allocate the device memory
if (dm == NULL)
dm = new byte[sz];
this->sz = sz;
return true;
}
/*! \brief destroy a chunk of memory
*
* Destroy a chunk of memory
*
*/
void HeapMemory::destroy()
{
delete [] dm;
}
/*! \brief copy the data from a pointer
*
* copy the data from a pointer
*
* \param ptr
*/
void HeapMemory::copyFromPointer(void * ptr)
{
// memory copy
memcpy(ptr,dm,sz);
}
/*! \brief copy from device to device
*
* copy a piece of memory from device to device
*
* \param CudaMemory from where to copy
*
*/
void HeapMemory::copyDeviceToDevice(HeapMemory & m)
{
//! The source buffer is too big to copy it
if (m.sz > sz)
{
std::cerr << "Error " << __LINE__ << __FILE__ << ": source buffer is too big to copy";
return;
}
memcpy(m.dm,dm,m.sz);
}
/*! \brief copy from memory
*
* copy from memory
*
* \param m a memory interface
*
*/
bool HeapMemory::copy(memory & m)
{
//! Here we try to cast memory into OpenFPMwdeviceCudaMemory
HeapMemory * ofpm = dynamic_cast<CudaMemory>(m);
//! if we fail we get the pointer and simply copy from the pointer
if (ofpm == NULL)
{
// copy the memory from device to host and from host to device
return copyFromPointer(m.getPointer());
}
else
{
// they are the same memory type, use cuda/thrust buffer copy
return copyDeviceToDevice(*ofpm);
}
return false;
}
/*! \brief Get the size of the allocated memory
*
* Get the size of the allocated memory
*
* \return the size of the allocated memory
*
*/
size_t HeapMemory::size()
{
return sz;
}
/*! \brief Resize the allocated memory
*
* Resize the allocated memory, if request is smaller than the allocated memory
* is not resized
*
* \param sz size
* \return true if the resize operation complete correctly
*
*/
bool HeapMemory::resize(size_t sz)
{
//! Allocate the device memory if not done yet
if (size() == 0)
return allocate(sz);
//! Create a new buffer if sz is bigger than the actual size
void * tdm;
tdm = new byte[sz];
//! copy from the old buffer to the new one
memcpy(dm,tdm,size());
//! free the old buffer
destroy();
//! change to the new buffer
dm = tdm;
this->sz = sz;
return true;
}
/*! \brief Return a readable pointer with your data
*
* Return a readable pointer with your data
*
*/
void * HeapMemory::getPointer()
{
return dm;
}