void CTaskHeap::SiftDown(int iSubRoot, SCHCMP *pfCompare)
{
int parent = iSubRoot;
int child = HEAP_LEFT_CHILD(parent);
PTASK_RECORD Ref = m_pHeap[parent];
while (child < m_nCurrent)
{
int rightchild = HEAP_RIGHT_CHILD(parent);
if (rightchild < m_nCurrent)
{
if (pfCompare(m_pHeap[rightchild], m_pHeap[child]) < 0)
{
child = rightchild;
}
}
if (pfCompare(Ref, m_pHeap[child]) <= 0)
break;
m_pHeap[parent] = m_pHeap[child];
parent = child;
child = HEAP_LEFT_CHILD(parent);
}
m_pHeap[parent] = Ref;
}
void MaxHeapify(int* pBuffer, uint32_t nIndex, uint32_t nBufferSize)
{
while (true)
{
uint32_t nLeft = HEAP_LEFT_CHILD(nIndex);
uint32_t nRight = HEAP_RIGHT_CHILD(nIndex);
uint32_t nLargest = nIndex;
if ((nLeft < nBufferSize) && (pBuffer[nLeft] > pBuffer[nIndex]))
{
nLargest = nLeft;
}
if ((nRight < nBufferSize) && (pBuffer[nLeft] < pBuffer[nRight]))
{
nLargest = nRight;
}
if (nLargest != nIndex)
{
std::swap(pBuffer[nLargest], pBuffer[nIndex]);
nIndex = nLargest;
}
else
{
break;
}
}
return;
}
void CQueuePriority::Heap_SiftDown( int iSubRoot )
{
int parent = iSubRoot;
int child = HEAP_LEFT_CHILD( parent );
struct tag_HEAP_NODE Ref = m_heap[ parent ];
while( child < m_cSize )
{
int rightchild = HEAP_RIGHT_CHILD( parent );
if( rightchild < m_cSize )
{
if( m_heap[ rightchild ].Priority < m_heap[ child ].Priority )
{
child = rightchild;
}
}
if( Ref.Priority <= m_heap[ child ].Priority )
break;
m_heap[ parent ] = m_heap[ child ];
parent = child;
child = HEAP_LEFT_CHILD( parent );
}
m_heap[ parent ] = Ref;
}
void _heap_rotdown(heap_t* heap, int pos)
{
int pos_left, pos_right;
if (!heap) return;
// rotate down
while (pos < (int)heap->count) {
pos_left = HEAP_LEFT_CHILD(pos);
pos_right = HEAP_RIGHT_CHILD(pos);
// no left & right
if (pos_left >= (int)heap->count) {
break;
}
// no right, left < pos
else if (pos_right >= (int)heap->count) {
if (heap->cmp_func(heap->array[pos_left].data, heap->array[pos].data) < 0) {
_heap_swap(heap, pos, pos_left);
pos = pos_left;
} else {
break;
}
}
// left < right, check to swap with left
else if (heap->cmp_func(heap->array[pos_left].data, heap->array[pos_right].data) < 0) {
if (heap->cmp_func(heap->array[pos_left].data, heap->array[pos].data) < 0) {
_heap_swap(heap, pos, pos_left);
pos = pos_left;
} else {
break;
}
}
// right <= left, check to swap with right
else {
if (heap->cmp_func(heap->array[pos_right].data, heap->array[pos].data) < 0) {
_heap_swap(heap, pos, pos_right);
pos = pos_right;
} else {
break;
}
}
}
}
