61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
|
#ifndef MEMCPY_THREADED_H_
|
||
|
|
#define MEMCPY_THREADED_H_
|
||
|
|
|
||
|
|
#include <cstring>
|
||
|
|
|
||
|
|
#include <QFuture>
|
||
|
|
#include <QFutureSynchronizer>
|
||
|
|
#include <QtConcurrentRun>
|
||
|
|
/** runable for memcopy/memmove
|
||
|
|
*/
|
||
|
|
struct copy_runable
|
||
|
|
{
|
||
|
|
void* m_Src; // source data pointer
|
||
|
|
void* m_Dst; // destination data pointer
|
||
|
|
size_t m_Size; // size to copy
|
||
|
|
/** run will execute the memcopy.
|
||
|
|
*/
|
||
|
|
void run( ) const
|
||
|
|
{
|
||
|
|
std::memmove( m_Dst, m_Src, m_Size );
|
||
|
|
}
|
||
|
|
};
|
||
|
|
/** thread function for a copy
|
||
|
|
*/
|
||
|
|
inline void copy_fun(copy_runable* prm)
|
||
|
|
{
|
||
|
|
prm->run();
|
||
|
|
}
|
||
|
|
/** multi threaded mem copy
|
||
|
|
*/
|
||
|
|
template <size_t THREAD_COUNT>
|
||
|
|
inline void memcpy_threaded( void *dst,void*src, size_t len)
|
||
|
|
{
|
||
|
|
if( len <= 0x200000) // if within L3 cache size use memcopy
|
||
|
|
{
|
||
|
|
std::memmove( dst, src, len);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
size_t copy_len = len/THREAD_COUNT;
|
||
|
|
copy_runable prm[THREAD_COUNT];
|
||
|
|
QFutureSynchronizer<void> RoadBlock;
|
||
|
|
for( size_t i = 0; i < THREAD_COUNT; ++ i)
|
||
|
|
{
|
||
|
|
prm[i].m_Src = src;
|
||
|
|
prm[i].m_Dst = dst;
|
||
|
|
prm[i].m_Size = copy_len;
|
||
|
|
|
||
|
|
RoadBlock.addFuture( QtConcurrent::run( copy_fun, &prm[i]) );
|
||
|
|
|
||
|
|
src = (char*)src + copy_len;
|
||
|
|
dst = (char*)dst + copy_len;
|
||
|
|
len -= copy_len;
|
||
|
|
if( len < copy_len)
|
||
|
|
{
|
||
|
|
copy_len = len;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
RoadBlock.waitForFinished();
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|